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gecko-dev/layout/forms/nsListControlFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nscore.h"
#include "nsCOMPtr.h"
#include "nsUnicharUtils.h"
#include "nsListControlFrame.h"
#include "nsFormControlFrame.h" // for COMPARE macro
#include "nsGkAtoms.h"
#include "nsIDOMHTMLSelectElement.h"
#include "nsIDOMHTMLOptionElement.h"
#include "nsComboboxControlFrame.h"
#include "nsIDOMHTMLOptGroupElement.h"
#include "nsIPresShell.h"
#include "nsIDOMMouseEvent.h"
#include "nsIXULRuntime.h"
#include "nsFontMetrics.h"
#include "nsIScrollableFrame.h"
#include "nsCSSRendering.h"
#include "nsIDOMEventListener.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsContentUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/HTMLOptionsCollection.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/TextEvents.h"
#include <algorithm>
using namespace mozilla;
// Constants
const uint32_t kMaxDropDownRows = 20; // This matches the setting for 4.x browsers
const int32_t kNothingSelected = -1;
// Static members
nsListControlFrame * nsListControlFrame::mFocused = nullptr;
nsString * nsListControlFrame::sIncrementalString = nullptr;
// Using for incremental typing navigation
#define INCREMENTAL_SEARCH_KEYPRESS_TIME 1000
// XXX, kyle.yuan@sun.com, there are 4 definitions for the same purpose:
// nsMenuPopupFrame.h, nsListControlFrame.cpp, listbox.xml, tree.xml
// need to find a good place to put them together.
// if someone changes one, please also change the other.
DOMTimeStamp nsListControlFrame::gLastKeyTime = 0;
/******************************************************************************
* nsListEventListener
* This class is responsible for propagating events to the nsListControlFrame.
* Frames are not refcounted so they can't be used as event listeners.
*****************************************************************************/
class nsListEventListener MOZ_FINAL : public nsIDOMEventListener
{
public:
nsListEventListener(nsListControlFrame *aFrame)
: mFrame(aFrame) { }
void SetFrame(nsListControlFrame *aFrame) { mFrame = aFrame; }
NS_DECL_ISUPPORTS
NS_DECL_NSIDOMEVENTLISTENER
private:
nsListControlFrame *mFrame;
};
//---------------------------------------------------------
nsIFrame*
NS_NewListControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
nsListControlFrame* it =
new (aPresShell) nsListControlFrame(aPresShell, aPresShell->GetDocument(), aContext);
it->AddStateBits(NS_FRAME_INDEPENDENT_SELECTION);
return it;
}
NS_IMPL_FRAMEARENA_HELPERS(nsListControlFrame)
//---------------------------------------------------------
nsListControlFrame::nsListControlFrame(
nsIPresShell* aShell, nsIDocument* aDocument, nsStyleContext* aContext)
: nsHTMLScrollFrame(aShell, aContext, false),
mMightNeedSecondPass(false),
mHasPendingInterruptAtStartOfReflow(false),
mDropdownCanGrow(false),
mLastDropdownComputedHeight(NS_UNCONSTRAINEDSIZE)
{
mComboboxFrame = nullptr;
mChangesSinceDragStart = false;
mButtonDown = false;
mIsAllContentHere = false;
mIsAllFramesHere = false;
mHasBeenInitialized = false;
mNeedToReset = true;
mPostChildrenLoadedReset = false;
mControlSelectMode = false;
}
//---------------------------------------------------------
nsListControlFrame::~nsListControlFrame()
{
mComboboxFrame = nullptr;
}
// for Bug 47302 (remove this comment later)
void
nsListControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
// get the receiver interface from the browser button's content node
ENSURE_TRUE(mContent);
// Clear the frame pointer on our event listener, just in case the
// event listener can outlive the frame.
mEventListener->SetFrame(nullptr);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("keydown"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("keypress"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mousedown"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mouseup"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mousemove"),
mEventListener, false);
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
nsHTMLScrollFrame::DestroyFrom(aDestructRoot);
}
void
nsListControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
// We allow visibility:hidden <select>s to contain visible options.
// Don't allow painting of list controls when painting is suppressed.
// XXX why do we need this here? we should never reach this. Maybe
// because these can have widgets? Hmm
if (aBuilder->IsBackgroundOnly())
return;
DO_GLOBAL_REFLOW_COUNT_DSP("nsListControlFrame");
if (IsInDropDownMode()) {
NS_ASSERTION(NS_GET_A(mLastDropdownBackstopColor) == 255,
"need an opaque backstop color");
// XXX Because we have an opaque widget and we get called to paint with
// this frame as the root of a stacking context we need make sure to draw
// some opaque color over the whole widget. (Bug 511323)
aLists.BorderBackground()->AppendNewToBottom(
new (aBuilder) nsDisplaySolidColor(aBuilder,
this, nsRect(aBuilder->ToReferenceFrame(this), GetSize()),
mLastDropdownBackstopColor));
}
nsHTMLScrollFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
}
/**
* This is called by the SelectsAreaFrame, which is the same
* as the frame returned by GetOptionsContainer. It's the frame which is
* scrolled by us.
* @param aPt the offset of this frame, relative to the rendering reference
* frame
*/
void nsListControlFrame::PaintFocus(nsRenderingContext& aRC, nsPoint aPt)
{
if (mFocused != this) return;
nsPresContext* presContext = PresContext();
nsIFrame* containerFrame = GetOptionsContainer();
if (!containerFrame) return;
nsIFrame* childframe = nullptr;
nsCOMPtr<nsIContent> focusedContent = GetCurrentOption();
if (focusedContent) {
childframe = focusedContent->GetPrimaryFrame();
}
nsRect fRect;
if (childframe) {
// get the child rect
fRect = childframe->GetRect();
// get it into our coordinates
fRect.MoveBy(childframe->GetParent()->GetOffsetTo(this));
} else {
float inflation = nsLayoutUtils::FontSizeInflationFor(this);
fRect.x = fRect.y = 0;
fRect.width = GetScrollPortRect().width;
fRect.height = CalcFallbackRowHeight(inflation);
fRect.MoveBy(containerFrame->GetOffsetTo(this));
}
fRect += aPt;
bool lastItemIsSelected = false;
if (focusedContent) {
nsCOMPtr<nsIDOMHTMLOptionElement> domOpt =
do_QueryInterface(focusedContent);
if (domOpt) {
domOpt->GetSelected(&lastItemIsSelected);
}
}
// set up back stop colors and then ask L&F service for the real colors
nscolor color =
LookAndFeel::GetColor(lastItemIsSelected ?
LookAndFeel::eColorID_WidgetSelectForeground :
LookAndFeel::eColorID_WidgetSelectBackground);
nsCSSRendering::PaintFocus(presContext, aRC, fRect, color);
}
void
nsListControlFrame::InvalidateFocus()
{
if (mFocused != this)
return;
nsIFrame* containerFrame = GetOptionsContainer();
if (containerFrame) {
containerFrame->InvalidateFrame();
}
}
NS_QUERYFRAME_HEAD(nsListControlFrame)
NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
NS_QUERYFRAME_ENTRY(nsIListControlFrame)
NS_QUERYFRAME_ENTRY(nsISelectControlFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsHTMLScrollFrame)
#ifdef ACCESSIBILITY
a11y::AccType
nsListControlFrame::AccessibleType()
{
return a11y::eHTMLSelectListType;
}
#endif
static nscoord
GetMaxOptionHeight(nsIFrame* aContainer)
{
nscoord result = 0;
for (nsIFrame* option = aContainer->GetFirstPrincipalChild();
option; option = option->GetNextSibling()) {
nscoord optionHeight;
if (nsCOMPtr<nsIDOMHTMLOptGroupElement>
(do_QueryInterface(option->GetContent()))) {
// an optgroup
optionHeight = GetMaxOptionHeight(option);
} else {
// an option
optionHeight = option->GetSize().height;
}
if (result < optionHeight)
result = optionHeight;
}
return result;
}
//-----------------------------------------------------------------
// Main Reflow for ListBox/Dropdown
//-----------------------------------------------------------------
nscoord
nsListControlFrame::CalcHeightOfARow()
{
// Calculate the height of a single row in the listbox or dropdown list by
// using the tallest thing in the subtree, since there may be option groups
// in addition to option elements, either of which may be visible or
// invisible, may use different fonts, etc.
int32_t heightOfARow = GetMaxOptionHeight(GetOptionsContainer());
// Check to see if we have zero items (and optimize by checking
// heightOfARow first)
if (heightOfARow == 0 && GetNumberOfOptions() == 0) {
float inflation = nsLayoutUtils::FontSizeInflationFor(this);
heightOfARow = CalcFallbackRowHeight(inflation);
}
return heightOfARow;
}
nscoord
nsListControlFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
// Always add scrollbar widths to the pref-width of the scrolled
// content. Combobox frames depend on this happening in the dropdown,
// and standalone listboxes are overflow:scroll so they need it too.
result = GetScrolledFrame()->GetPrefWidth(aRenderingContext);
result = NSCoordSaturatingAdd(result,
GetDesiredScrollbarSizes(PresContext(), aRenderingContext).LeftRight());
return result;
}
nscoord
nsListControlFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
// Always add scrollbar widths to the min-width of the scrolled
// content. Combobox frames depend on this happening in the dropdown,
// and standalone listboxes are overflow:scroll so they need it too.
result = GetScrolledFrame()->GetMinWidth(aRenderingContext);
result += GetDesiredScrollbarSizes(PresContext(), aRenderingContext).LeftRight();
return result;
}
nsresult
nsListControlFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aReflowState.ComputedWidth() != NS_UNCONSTRAINEDSIZE,
"Must have a computed width");
SchedulePaint();
mHasPendingInterruptAtStartOfReflow = aPresContext->HasPendingInterrupt();
// If all the content and frames are here
// then initialize it before reflow
if (mIsAllContentHere && !mHasBeenInitialized) {
if (false == mIsAllFramesHere) {
CheckIfAllFramesHere();
}
if (mIsAllFramesHere && !mHasBeenInitialized) {
mHasBeenInitialized = true;
}
}
if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
nsFormControlFrame::RegUnRegAccessKey(this, true);
}
if (IsInDropDownMode()) {
return ReflowAsDropdown(aPresContext, aDesiredSize, aReflowState, aStatus);
}
/*
* Due to the fact that our intrinsic height depends on the heights of our
* kids, we end up having to do two-pass reflow, in general -- the first pass
* to find the intrinsic height and a second pass to reflow the scrollframe
* at that height (which will size the scrollbars correctly, etc).
*
* Naturaly, we want to avoid doing the second reflow as much as possible.
* We can skip it in the following cases (in all of which the first reflow is
* already happening at the right height):
*
* - We're reflowing with a constrained computed height -- just use that
* height.
* - We're not dirty and have no dirty kids and shouldn't be reflowing all
* kids. In this case, our cached max height of a child is not going to
* change.
* - We do our first reflow using our cached max height of a child, then
* compute the new max height and it's the same as the old one.
*/
bool autoHeight = (aReflowState.ComputedHeight() == NS_UNCONSTRAINEDSIZE);
mMightNeedSecondPass = autoHeight &&
(NS_SUBTREE_DIRTY(this) || aReflowState.ShouldReflowAllKids());
nsHTMLReflowState state(aReflowState);
int32_t length = GetNumberOfRows();
nscoord oldHeightOfARow = HeightOfARow();
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW) && autoHeight) {
// When not doing an initial reflow, and when the height is auto, start off
// with our computed height set to what we'd expect our height to be.
nscoord computedHeight = CalcIntrinsicHeight(oldHeightOfARow, length);
computedHeight = state.ApplyMinMaxHeight(computedHeight);
state.SetComputedHeight(computedHeight);
}
nsresult rv = nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize,
state, aStatus);
NS_ENSURE_SUCCESS(rv, rv);
if (!mMightNeedSecondPass) {
NS_ASSERTION(!autoHeight || HeightOfARow() == oldHeightOfARow,
"How did our height of a row change if nothing was dirty?");
NS_ASSERTION(!autoHeight ||
!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How do we not need a second pass during initial reflow at "
"auto height?");
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if we don't need a second pass!");
if (!autoHeight) {
// Update our mNumDisplayRows based on our new row height now that we
// know it. Note that if autoHeight and we landed in this code then we
// already set mNumDisplayRows in CalcIntrinsicHeight. Also note that we
// can't use HeightOfARow() here because that just uses a cached value
// that we didn't compute.
nscoord rowHeight = CalcHeightOfARow();
if (rowHeight == 0) {
// Just pick something
mNumDisplayRows = 1;
} else {
mNumDisplayRows = std::max(1, state.ComputedHeight() / rowHeight);
}
}
return rv;
}
mMightNeedSecondPass = false;
// Now see whether we need a second pass. If we do, our nsSelectsAreaFrame
// will have suppressed the scrollbar update.
if (!IsScrollbarUpdateSuppressed()) {
// All done. No need to do more reflow.
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if the height of a row has not "
"changed!");
return rv;
}
SetSuppressScrollbarUpdate(false);
// Gotta reflow again.
// XXXbz We're just changing the height here; do we need to dirty ourselves
// or anything like that? We might need to, per the letter of the reflow
// protocol, but things seem to work fine without it... Is that just an
// implementation detail of nsHTMLScrollFrame that we're depending on?
nsHTMLScrollFrame::DidReflow(aPresContext, &state,
nsDidReflowStatus::FINISHED);
// Now compute the height we want to have
nscoord computedHeight = CalcIntrinsicHeight(HeightOfARow(), length);
computedHeight = state.ApplyMinMaxHeight(computedHeight);
state.SetComputedHeight(computedHeight);
nsHTMLScrollFrame::WillReflow(aPresContext);
// XXXbz to make the ascent really correct, we should add our
// mComputedPadding.top to it (and subtract it from descent). Need that
// because nsGfxScrollFrame just adds in the border....
return nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
}
nsresult
nsListControlFrame::ReflowAsDropdown(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aReflowState.ComputedHeight() == NS_UNCONSTRAINEDSIZE,
"We should not have a computed height here!");
mMightNeedSecondPass = NS_SUBTREE_DIRTY(this) ||
aReflowState.ShouldReflowAllKids();
#ifdef DEBUG
nscoord oldHeightOfARow = HeightOfARow();
nscoord oldVisibleHeight = (GetStateBits() & NS_FRAME_FIRST_REFLOW) ?
NS_UNCONSTRAINEDSIZE : GetScrolledFrame()->GetSize().height;
#endif
nsHTMLReflowState state(aReflowState);
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
// When not doing an initial reflow, and when the height is auto, start off
// with our computed height set to what we'd expect our height to be.
// Note: At this point, mLastDropdownComputedHeight can be
// NS_UNCONSTRAINEDSIZE in cases when last time we didn't have to constrain
// the height. That's fine; just do the same thing as last time.
state.SetComputedHeight(mLastDropdownComputedHeight);
}
nsresult rv = nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize,
state, aStatus);
NS_ENSURE_SUCCESS(rv, rv);
if (!mMightNeedSecondPass) {
NS_ASSERTION(oldVisibleHeight == GetScrolledFrame()->GetSize().height,
"How did our kid's height change if nothing was dirty?");
NS_ASSERTION(HeightOfARow() == oldHeightOfARow,
"How did our height of a row change if nothing was dirty?");
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if we don't need a second pass!");
NS_ASSERTION(!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How can we avoid a second pass during first reflow?");
return rv;
}
mMightNeedSecondPass = false;
// Now see whether we need a second pass. If we do, our nsSelectsAreaFrame
// will have suppressed the scrollbar update.
if (!IsScrollbarUpdateSuppressed()) {
// All done. No need to do more reflow.
NS_ASSERTION(!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How can we avoid a second pass during first reflow?");
return rv;
}
SetSuppressScrollbarUpdate(false);
nscoord visibleHeight = GetScrolledFrame()->GetSize().height;
nscoord heightOfARow = HeightOfARow();
// Gotta reflow again.
// XXXbz We're just changing the height here; do we need to dirty ourselves
// or anything like that? We might need to, per the letter of the reflow
// protocol, but things seem to work fine without it... Is that just an
// implementation detail of nsHTMLScrollFrame that we're depending on?
nsHTMLScrollFrame::DidReflow(aPresContext, &state,
nsDidReflowStatus::FINISHED);
// Now compute the height we want to have.
// Note: no need to apply min/max constraints, since we have no such
// rules applied to the combobox dropdown.
mDropdownCanGrow = false;
if (visibleHeight <= 0 || heightOfARow <= 0) {
// Looks like we have no options. Just size us to a single row height.
state.SetComputedHeight(heightOfARow);
mNumDisplayRows = 1;
} else {
nsComboboxControlFrame* combobox = static_cast<nsComboboxControlFrame*>(mComboboxFrame);
nsPoint translation;
nscoord above, below;
combobox->GetAvailableDropdownSpace(&above, &below, &translation);
if (above <= 0 && below <= 0) {
state.SetComputedHeight(heightOfARow);
mNumDisplayRows = 1;
mDropdownCanGrow = GetNumberOfRows() > 1;
} else {
nscoord bp = aReflowState.ComputedPhysicalBorderPadding().TopBottom();
nscoord availableHeight = std::max(above, below) - bp;
nscoord newHeight;
uint32_t rows;
if (visibleHeight <= availableHeight) {
// The dropdown fits in the available height.
rows = GetNumberOfRows();
mNumDisplayRows = clamped<uint32_t>(rows, 1, kMaxDropDownRows);
if (mNumDisplayRows == rows) {
newHeight = visibleHeight; // use the exact height
} else {
newHeight = mNumDisplayRows * heightOfARow; // approximate
}
} else {
rows = availableHeight / heightOfARow;
mNumDisplayRows = clamped<uint32_t>(rows, 1, kMaxDropDownRows);
newHeight = mNumDisplayRows * heightOfARow; // approximate
}
state.SetComputedHeight(newHeight);
mDropdownCanGrow = visibleHeight - newHeight >= heightOfARow &&
mNumDisplayRows != kMaxDropDownRows;
}
}
mLastDropdownComputedHeight = state.ComputedHeight();
nsHTMLScrollFrame::WillReflow(aPresContext);
return nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
}
ScrollbarStyles
nsListControlFrame::GetScrollbarStyles() const
{
// We can't express this in the style system yet; when we can, this can go away
// and GetScrollbarStyles can be devirtualized
int32_t verticalStyle = IsInDropDownMode() ? NS_STYLE_OVERFLOW_AUTO
: NS_STYLE_OVERFLOW_SCROLL;
return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, verticalStyle);
}
bool
nsListControlFrame::ShouldPropagateComputedHeightToScrolledContent() const
{
return !IsInDropDownMode();
}
//---------------------------------------------------------
nsIFrame*
nsListControlFrame::GetContentInsertionFrame() {
return GetOptionsContainer()->GetContentInsertionFrame();
}
//---------------------------------------------------------
bool
nsListControlFrame::ExtendedSelection(int32_t aStartIndex,
int32_t aEndIndex,
bool aClearAll)
{
return SetOptionsSelectedFromFrame(aStartIndex, aEndIndex,
true, aClearAll);
}
//---------------------------------------------------------
bool
nsListControlFrame::SingleSelection(int32_t aClickedIndex, bool aDoToggle)
{
if (mComboboxFrame) {
mComboboxFrame->UpdateRecentIndex(GetSelectedIndex());
}
bool wasChanged = false;
// Get Current selection
if (aDoToggle) {
wasChanged = ToggleOptionSelectedFromFrame(aClickedIndex);
} else {
wasChanged = SetOptionsSelectedFromFrame(aClickedIndex, aClickedIndex,
true, true);
}
nsWeakFrame weakFrame(this);
ScrollToIndex(aClickedIndex);
if (!weakFrame.IsAlive()) {
return wasChanged;
}
#ifdef ACCESSIBILITY
bool isCurrentOptionChanged = mEndSelectionIndex != aClickedIndex;
#endif
mStartSelectionIndex = aClickedIndex;
mEndSelectionIndex = aClickedIndex;
InvalidateFocus();
#ifdef ACCESSIBILITY
if (isCurrentOptionChanged) {
FireMenuItemActiveEvent();
}
#endif
return wasChanged;
}
void
nsListControlFrame::InitSelectionRange(int32_t aClickedIndex)
{
//
// If nothing is selected, set the start selection depending on where
// the user clicked and what the initial selection is:
// - if the user clicked *before* selectedIndex, set the start index to
// the end of the first contiguous selection.
// - if the user clicked *after* the end of the first contiguous
// selection, set the start index to selectedIndex.
// - if the user clicked *within* the first contiguous selection, set the
// start index to selectedIndex.
// The last two rules, of course, boil down to the same thing: if the user
// clicked >= selectedIndex, return selectedIndex.
//
// This makes it so that shift click works properly when you first click
// in a multiple select.
//
int32_t selectedIndex = GetSelectedIndex();
if (selectedIndex >= 0) {
// Get the end of the contiguous selection
nsRefPtr<dom::HTMLOptionsCollection> options = GetOptions();
NS_ASSERTION(options, "Collection of options is null!");
uint32_t numOptions = options->Length();
// Push i to one past the last selected index in the group.
uint32_t i;
for (i = selectedIndex + 1; i < numOptions; i++) {
if (!options->ItemAsOption(i)->Selected()) {
break;
}
}
if (aClickedIndex < selectedIndex) {
// User clicked before selection, so start selection at end of
// contiguous selection
mStartSelectionIndex = i-1;
mEndSelectionIndex = selectedIndex;
} else {
// User clicked after selection, so start selection at start of
// contiguous selection
mStartSelectionIndex = selectedIndex;
mEndSelectionIndex = i-1;
}
}
}
static uint32_t
CountOptionsAndOptgroups(nsIFrame* aFrame)
{
uint32_t count = 0;
nsFrameList::Enumerator e(aFrame->PrincipalChildList());
for (; !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
nsIContent* content = child->GetContent();
if (content) {
if (content->IsHTML(nsGkAtoms::option)) {
++count;
} else {
nsCOMPtr<nsIDOMHTMLOptGroupElement> optgroup = do_QueryInterface(content);
if (optgroup) {
nsAutoString label;
optgroup->GetLabel(label);
if (label.Length() > 0) {
++count;
}
count += CountOptionsAndOptgroups(child);
}
}
}
}
return count;
}
uint32_t
nsListControlFrame::GetNumberOfRows()
{
return ::CountOptionsAndOptgroups(GetContentInsertionFrame());
}
//---------------------------------------------------------
bool
nsListControlFrame::PerformSelection(int32_t aClickedIndex,
bool aIsShift,
bool aIsControl)
{
bool wasChanged = false;
if (aClickedIndex == kNothingSelected) {
}
else if (GetMultiple()) {
if (aIsShift) {
// Make sure shift+click actually does something expected when
// the user has never clicked on the select
if (mStartSelectionIndex == kNothingSelected) {
InitSelectionRange(aClickedIndex);
}
// Get the range from beginning (low) to end (high)
// Shift *always* works, even if the current option is disabled
int32_t startIndex;
int32_t endIndex;
if (mStartSelectionIndex == kNothingSelected) {
startIndex = aClickedIndex;
endIndex = aClickedIndex;
} else if (mStartSelectionIndex <= aClickedIndex) {
startIndex = mStartSelectionIndex;
endIndex = aClickedIndex;
} else {
startIndex = aClickedIndex;
endIndex = mStartSelectionIndex;
}
// Clear only if control was not pressed
wasChanged = ExtendedSelection(startIndex, endIndex, !aIsControl);
nsWeakFrame weakFrame(this);
ScrollToIndex(aClickedIndex);
if (!weakFrame.IsAlive()) {
return wasChanged;
}
if (mStartSelectionIndex == kNothingSelected) {
mStartSelectionIndex = aClickedIndex;
}
#ifdef ACCESSIBILITY
bool isCurrentOptionChanged = mEndSelectionIndex != aClickedIndex;
#endif
mEndSelectionIndex = aClickedIndex;
InvalidateFocus();
#ifdef ACCESSIBILITY
if (isCurrentOptionChanged) {
FireMenuItemActiveEvent();
}
#endif
} else if (aIsControl) {
wasChanged = SingleSelection(aClickedIndex, true); // might destroy us
} else {
wasChanged = SingleSelection(aClickedIndex, false); // might destroy us
}
} else {
wasChanged = SingleSelection(aClickedIndex, false); // might destroy us
}
return wasChanged;
}
//---------------------------------------------------------
bool
nsListControlFrame::HandleListSelection(nsIDOMEvent* aEvent,
int32_t aClickedIndex)
{
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aEvent);
bool isShift;
bool isControl;
#ifdef XP_MACOSX
mouseEvent->GetMetaKey(&isControl);
#else
mouseEvent->GetCtrlKey(&isControl);
#endif
mouseEvent->GetShiftKey(&isShift);
return PerformSelection(aClickedIndex, isShift, isControl); // might destroy us
}
//---------------------------------------------------------
void
nsListControlFrame::CaptureMouseEvents(bool aGrabMouseEvents)
{
// Currently cocoa widgets use a native popup widget which tracks clicks synchronously,
// so we never want to do mouse capturing. Note that we only bail if the list
// is in drop-down mode, and the caller is requesting capture (we let release capture
// requests go through to ensure that we can release capture requested via other
// code paths, if any exist).
if (aGrabMouseEvents && IsInDropDownMode() && nsComboboxControlFrame::ToolkitHasNativePopup())
return;
if (aGrabMouseEvents) {
nsIPresShell::SetCapturingContent(mContent, CAPTURE_IGNOREALLOWED);
} else {
nsIContent* capturingContent = nsIPresShell::GetCapturingContent();
bool dropDownIsHidden = false;
if (IsInDropDownMode()) {
dropDownIsHidden = !mComboboxFrame->IsDroppedDown();
}
if (capturingContent == mContent || dropDownIsHidden) {
// only clear the capturing content if *we* are the ones doing the
// capturing (or if the dropdown is hidden, in which case NO-ONE should
// be capturing anything - it could be a scrollbar inside this listbox
// which is actually grabbing
// This shouldn't be necessary. We should simply ensure that events targeting
// scrollbars are never visible to DOM consumers.
nsIPresShell::SetCapturingContent(nullptr, 0);
}
}
}
//---------------------------------------------------------
nsresult
nsListControlFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
NS_ENSURE_ARG_POINTER(aEventStatus);
/*const char * desc[] = {"NS_MOUSE_MOVE",
"NS_MOUSE_LEFT_BUTTON_UP",
"NS_MOUSE_LEFT_BUTTON_DOWN",
"<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>",
"NS_MOUSE_MIDDLE_BUTTON_UP",
"NS_MOUSE_MIDDLE_BUTTON_DOWN",
"<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>",
"NS_MOUSE_RIGHT_BUTTON_UP",
"NS_MOUSE_RIGHT_BUTTON_DOWN",
"NS_MOUSE_ENTER_SYNTH",
"NS_MOUSE_EXIT_SYNTH",
"NS_MOUSE_LEFT_DOUBLECLICK",
"NS_MOUSE_MIDDLE_DOUBLECLICK",
"NS_MOUSE_RIGHT_DOUBLECLICK",
"NS_MOUSE_LEFT_CLICK",
"NS_MOUSE_MIDDLE_CLICK",
"NS_MOUSE_RIGHT_CLICK"};
int inx = aEvent->message-NS_MOUSE_MESSAGE_START;
if (inx >= 0 && inx <= (NS_MOUSE_RIGHT_CLICK-NS_MOUSE_MESSAGE_START)) {
printf("Mouse in ListFrame %s [%d]\n", desc[inx], aEvent->message);
} else {
printf("Mouse in ListFrame <UNKNOWN> [%d]\n", aEvent->message);
}*/
if (nsEventStatus_eConsumeNoDefault == *aEventStatus)
return NS_OK;
// do we have style that affects how we are selected?
// do we have user-input style?
const nsStyleUserInterface* uiStyle = StyleUserInterface();
if (uiStyle->mUserInput == NS_STYLE_USER_INPUT_NONE || uiStyle->mUserInput == NS_STYLE_USER_INPUT_DISABLED)
return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED))
return NS_OK;
return nsHTMLScrollFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
//---------------------------------------------------------
nsresult
nsListControlFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
// First check to see if all the content has been added
mIsAllContentHere = mContent->IsDoneAddingChildren();
if (!mIsAllContentHere) {
mIsAllFramesHere = false;
mHasBeenInitialized = false;
}
nsresult rv = nsHTMLScrollFrame::SetInitialChildList(aListID, aChildList);
// If all the content is here now check
// to see if all the frames have been created
/*if (mIsAllContentHere) {
// If all content and frames are here
// the reset/initialize
if (CheckIfAllFramesHere()) {
ResetList(aPresContext);
mHasBeenInitialized = true;
}
}*/
return rv;
}
//---------------------------------------------------------
void
nsListControlFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsHTMLScrollFrame::Init(aContent, aParent, aPrevInFlow);
// we shouldn't have to unregister this listener because when
// our frame goes away all these content node go away as well
// because our frame is the only one who references them.
// we need to hook up our listeners before the editor is initialized
mEventListener = new nsListEventListener(this);
mContent->AddSystemEventListener(NS_LITERAL_STRING("keydown"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("keypress"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mousedown"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mouseup"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mousemove"),
mEventListener, false, false);
mStartSelectionIndex = kNothingSelected;
mEndSelectionIndex = kNothingSelected;
mLastDropdownBackstopColor = PresContext()->DefaultBackgroundColor();
if (IsInDropDownMode()) {
AddStateBits(NS_FRAME_IN_POPUP);
}
}
dom::HTMLOptionsCollection*
nsListControlFrame::GetOptions() const
{
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
NS_ENSURE_TRUE(select, nullptr);
return select->Options();
}
dom::HTMLOptionElement*
nsListControlFrame::GetOption(uint32_t aIndex) const
{
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
NS_ENSURE_TRUE(select, nullptr);
return select->Item(aIndex);
}
NS_IMETHODIMP
nsListControlFrame::OnOptionSelected(int32_t aIndex, bool aSelected)
{
if (aSelected) {
ScrollToIndex(aIndex);
}
return NS_OK;
}
void
nsListControlFrame::OnContentReset()
{
ResetList(true);
}
void
nsListControlFrame::ResetList(bool aAllowScrolling)
{
// if all the frames aren't here
// don't bother reseting
if (!mIsAllFramesHere) {
return;
}
if (aAllowScrolling) {
mPostChildrenLoadedReset = true;
// Scroll to the selected index
int32_t indexToSelect = kNothingSelected;
nsCOMPtr<nsIDOMHTMLSelectElement> selectElement(do_QueryInterface(mContent));
NS_ASSERTION(selectElement, "No select element!");
if (selectElement) {
selectElement->GetSelectedIndex(&indexToSelect);
nsWeakFrame weakFrame(this);
ScrollToIndex(indexToSelect);
if (!weakFrame.IsAlive()) {
return;
}
}
}
mStartSelectionIndex = kNothingSelected;
mEndSelectionIndex = kNothingSelected;
InvalidateFocus();
// Combobox will redisplay itself with the OnOptionSelected event
}
void
nsListControlFrame::SetFocus(bool aOn, bool aRepaint)
{
InvalidateFocus();
if (aOn) {
ComboboxFocusSet();
mFocused = this;
} else {
mFocused = nullptr;
}
InvalidateFocus();
}
void nsListControlFrame::ComboboxFocusSet()
{
gLastKeyTime = 0;
}
void
nsListControlFrame::SetComboboxFrame(nsIFrame* aComboboxFrame)
{
if (nullptr != aComboboxFrame) {
mComboboxFrame = do_QueryFrame(aComboboxFrame);
}
}
void
nsListControlFrame::GetOptionText(uint32_t aIndex, nsAString& aStr)
{
aStr.Truncate();
if (dom::HTMLOptionElement* optionElement = GetOption(aIndex)) {
optionElement->GetText(aStr);
}
}
int32_t
nsListControlFrame::GetSelectedIndex()
{
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
return select->SelectedIndex();
}
dom::HTMLOptionElement*
nsListControlFrame::GetCurrentOption()
{
// The mEndSelectionIndex is what is currently being selected. Use
// the selected index if this is kNothingSelected.
int32_t focusedIndex = (mEndSelectionIndex == kNothingSelected) ?
GetSelectedIndex() : mEndSelectionIndex;
if (focusedIndex != kNothingSelected) {
return GetOption(SafeCast<uint32_t>(focusedIndex));
}
// There is no selected item. Return the first non-disabled item.
nsRefPtr<dom::HTMLSelectElement> selectElement =
dom::HTMLSelectElement::FromContent(mContent);
for (uint32_t i = 0, length = selectElement->Length(); i < length; ++i) {
dom::HTMLOptionElement* node = selectElement->Item(i);
if (!node) {
return nullptr;
}
if (!selectElement->IsOptionDisabled(node)) {
return node;
}
}
return nullptr;
}
bool
nsListControlFrame::IsInDropDownMode() const
{
return (mComboboxFrame != nullptr);
}
uint32_t
nsListControlFrame::GetNumberOfOptions()
{
dom::HTMLOptionsCollection* options = GetOptions();
if (!options) {
return 0;
}
return options->Length();
}
//----------------------------------------------------------------------
// nsISelectControlFrame
//----------------------------------------------------------------------
bool nsListControlFrame::CheckIfAllFramesHere()
{
// Get the number of optgroups and options
//int32_t numContentItems = 0;
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(mContent));
if (node) {
// XXX Need to find a fail proff way to determine that
// all the frames are there
mIsAllFramesHere = true;//NS_OK == CountAllChild(node, numContentItems);
}
// now make sure we have a frame each piece of content
return mIsAllFramesHere;
}
NS_IMETHODIMP
nsListControlFrame::DoneAddingChildren(bool aIsDone)
{
mIsAllContentHere = aIsDone;
if (mIsAllContentHere) {
// Here we check to see if all the frames have been created
// for all the content.
// If so, then we can initialize;
if (!mIsAllFramesHere) {
// if all the frames are now present we can initialize
if (CheckIfAllFramesHere()) {
mHasBeenInitialized = true;
ResetList(true);
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsListControlFrame::AddOption(int32_t aIndex)
{
#ifdef DO_REFLOW_DEBUG
printf("---- Id: %d nsLCF %p Added Option %d\n", mReflowId, this, aIndex);
#endif
if (!mIsAllContentHere) {
mIsAllContentHere = mContent->IsDoneAddingChildren();
if (!mIsAllContentHere) {
mIsAllFramesHere = false;
mHasBeenInitialized = false;
} else {
mIsAllFramesHere = (aIndex == static_cast<int32_t>(GetNumberOfOptions()-1));
}
}
// Make sure we scroll to the selected option as needed
mNeedToReset = true;
if (!mHasBeenInitialized) {
return NS_OK;
}
mPostChildrenLoadedReset = mIsAllContentHere;
return NS_OK;
}
static int32_t
DecrementAndClamp(int32_t aSelectionIndex, int32_t aLength)
{
return aLength == 0 ? kNothingSelected : std::max(0, aSelectionIndex - 1);
}
NS_IMETHODIMP
nsListControlFrame::RemoveOption(int32_t aIndex)
{
NS_PRECONDITION(aIndex >= 0, "negative <option> index");
// Need to reset if we're a dropdown
if (IsInDropDownMode()) {
mNeedToReset = true;
mPostChildrenLoadedReset = mIsAllContentHere;
}
if (mStartSelectionIndex != kNothingSelected) {
NS_ASSERTION(mEndSelectionIndex != kNothingSelected, "");
int32_t numOptions = GetNumberOfOptions();
// NOTE: numOptions is the new number of options whereas aIndex is the
// unadjusted index of the removed option (hence the <= below).
NS_ASSERTION(aIndex <= numOptions, "out-of-bounds <option> index");
int32_t forward = mEndSelectionIndex - mStartSelectionIndex;
int32_t* low = forward >= 0 ? &mStartSelectionIndex : &mEndSelectionIndex;
int32_t* high = forward >= 0 ? &mEndSelectionIndex : &mStartSelectionIndex;
if (aIndex < *low)
*low = ::DecrementAndClamp(*low, numOptions);
if (aIndex <= *high)
*high = ::DecrementAndClamp(*high, numOptions);
if (forward == 0)
*low = *high;
}
else
NS_ASSERTION(mEndSelectionIndex == kNothingSelected, "");
InvalidateFocus();
return NS_OK;
}
//---------------------------------------------------------
// Set the option selected in the DOM. This method is named
// as it is because it indicates that the frame is the source
// of this event rather than the receiver.
bool
nsListControlFrame::SetOptionsSelectedFromFrame(int32_t aStartIndex,
int32_t aEndIndex,
bool aValue,
bool aClearAll)
{
nsRefPtr<dom::HTMLSelectElement> selectElement =
dom::HTMLSelectElement::FromContent(mContent);
uint32_t mask = dom::HTMLSelectElement::NOTIFY;
if (aValue) {
mask |= dom::HTMLSelectElement::IS_SELECTED;
}
if (aClearAll) {
mask |= dom::HTMLSelectElement::CLEAR_ALL;
}
return selectElement->SetOptionsSelectedByIndex(aStartIndex, aEndIndex, mask);
}
bool
nsListControlFrame::ToggleOptionSelectedFromFrame(int32_t aIndex)
{
nsRefPtr<dom::HTMLOptionElement> option =
GetOption(static_cast<uint32_t>(aIndex));
NS_ENSURE_TRUE(option, false);
nsRefPtr<dom::HTMLSelectElement> selectElement =
dom::HTMLSelectElement::FromContent(mContent);
uint32_t mask = dom::HTMLSelectElement::NOTIFY;
if (!option->Selected()) {
mask |= dom::HTMLSelectElement::IS_SELECTED;
}
return selectElement->SetOptionsSelectedByIndex(aIndex, aIndex, mask);
}
// Dispatch event and such
bool
nsListControlFrame::UpdateSelection()
{
if (mIsAllFramesHere) {
// if it's a combobox, display the new text
nsWeakFrame weakFrame(this);
if (mComboboxFrame) {
mComboboxFrame->RedisplaySelectedText();
}
// if it's a listbox, fire on change
else if (mIsAllContentHere) {
FireOnChange();
}
return weakFrame.IsAlive();
}
return true;
}
void
nsListControlFrame::ComboboxFinish(int32_t aIndex)
{
gLastKeyTime = 0;
if (mComboboxFrame) {
nsWeakFrame weakFrame(this);
PerformSelection(aIndex, false, false); // might destroy us
if (!weakFrame.IsAlive() || !mComboboxFrame) {
return;
}
int32_t displayIndex = mComboboxFrame->GetIndexOfDisplayArea();
if (displayIndex != aIndex) {
mComboboxFrame->RedisplaySelectedText(); // might destroy us
}
if (weakFrame.IsAlive() && mComboboxFrame) {
mComboboxFrame->RollupFromList(); // might destroy us
}
}
}
// Send out an onchange notification.
void
nsListControlFrame::FireOnChange()
{
if (mComboboxFrame) {
// Return hit without changing anything
int32_t index = mComboboxFrame->UpdateRecentIndex(NS_SKIP_NOTIFY_INDEX);
if (index == NS_SKIP_NOTIFY_INDEX)
return;
// See if the selection actually changed
if (index == GetSelectedIndex())
return;
}
// Dispatch the change event.
nsContentUtils::DispatchTrustedEvent(mContent->OwnerDoc(), mContent,
NS_LITERAL_STRING("change"), true,
false);
}
NS_IMETHODIMP
nsListControlFrame::OnSetSelectedIndex(int32_t aOldIndex, int32_t aNewIndex)
{
if (mComboboxFrame) {
// UpdateRecentIndex with NS_SKIP_NOTIFY_INDEX, so that we won't fire an onchange
// event for this setting of selectedIndex.
mComboboxFrame->UpdateRecentIndex(NS_SKIP_NOTIFY_INDEX);
}
nsWeakFrame weakFrame(this);
ScrollToIndex(aNewIndex);
if (!weakFrame.IsAlive()) {
return NS_OK;
}
mStartSelectionIndex = aNewIndex;
mEndSelectionIndex = aNewIndex;
InvalidateFocus();
#ifdef ACCESSIBILITY
FireMenuItemActiveEvent();
#endif
return NS_OK;
}
//----------------------------------------------------------------------
// End nsISelectControlFrame
//----------------------------------------------------------------------
nsresult
nsListControlFrame::SetFormProperty(nsIAtom* aName,
const nsAString& aValue)
{
if (nsGkAtoms::selected == aName) {
return NS_ERROR_INVALID_ARG; // Selected is readonly according to spec.
} else if (nsGkAtoms::selectedindex == aName) {
// You shouldn't be calling me for this!!!
return NS_ERROR_INVALID_ARG;
}
// We should be told about selectedIndex by the DOM element through
// OnOptionSelected
return NS_OK;
}
void
nsListControlFrame::AboutToDropDown()
{
NS_ASSERTION(IsInDropDownMode(),
"AboutToDropDown called without being in dropdown mode");
// Our widget doesn't get invalidated on changes to the rest of the document,
// so compute and store this color at the start of a dropdown so we don't
// get weird painting behaviour.
// We start looking for backgrounds above the combobox frame to avoid
// duplicating the combobox frame's background and compose each background
// color we find underneath until we have an opaque color, or run out of
// backgrounds. We compose with the PresContext default background color,
// which is always opaque, in case we don't end up with an opaque color.
// This gives us a very poor approximation of translucency.
nsIFrame* comboboxFrame = do_QueryFrame(mComboboxFrame);
nsStyleContext* context = comboboxFrame->StyleContext()->GetParent();
mLastDropdownBackstopColor = NS_RGBA(0,0,0,0);
while (NS_GET_A(mLastDropdownBackstopColor) < 255 && context) {
mLastDropdownBackstopColor =
NS_ComposeColors(context->StyleBackground()->mBackgroundColor,
mLastDropdownBackstopColor);
context = context->GetParent();
}
mLastDropdownBackstopColor =
NS_ComposeColors(PresContext()->DefaultBackgroundColor(),
mLastDropdownBackstopColor);
if (mIsAllContentHere && mIsAllFramesHere && mHasBeenInitialized) {
nsWeakFrame weakFrame(this);
ScrollToIndex(GetSelectedIndex());
if (!weakFrame.IsAlive()) {
return;
}
#ifdef ACCESSIBILITY
FireMenuItemActiveEvent(); // Inform assistive tech what got focus
#endif
}
mItemSelectionStarted = false;
}
// We are about to be rolledup from the outside (ComboboxFrame)
void
nsListControlFrame::AboutToRollup()
{
// We've been updating the combobox with the keyboard up until now, but not
// with the mouse. The problem is, even with mouse selection, we are
// updating the <select>. So if the mouse goes over an option just before
// he leaves the box and clicks, that's what the <select> will show.
//
// To deal with this we say "whatever is in the combobox is canonical."
// - IF the combobox is different from the current selected index, we
// reset the index.
if (IsInDropDownMode()) {
ComboboxFinish(mComboboxFrame->GetIndexOfDisplayArea()); // might destroy us
}
}
nsresult
nsListControlFrame::DidReflow(nsPresContext* aPresContext,
const nsHTMLReflowState* aReflowState,
nsDidReflowStatus aStatus)
{
nsresult rv;
bool wasInterrupted = !mHasPendingInterruptAtStartOfReflow &&
aPresContext->HasPendingInterrupt();
rv = nsHTMLScrollFrame::DidReflow(aPresContext, aReflowState, aStatus);
if (mNeedToReset && !wasInterrupted) {
mNeedToReset = false;
// Suppress scrolling to the selected element if we restored
// scroll history state AND the list contents have not changed
// since we loaded all the children AND nothing else forced us
// to scroll by calling ResetList(true). The latter two conditions
// are folded into mPostChildrenLoadedReset.
//
// The idea is that we want scroll history restoration to trump ResetList
// scrolling to the selected element, when the ResetList was probably only
// caused by content loading normally.
ResetList(!DidHistoryRestore() || mPostChildrenLoadedReset);
}
mHasPendingInterruptAtStartOfReflow = false;
return rv;
}
nsIAtom*
nsListControlFrame::GetType() const
{
return nsGkAtoms::listControlFrame;
}
#ifdef DEBUG_FRAME_DUMP
nsresult
nsListControlFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("ListControl"), aResult);
}
#endif
nscoord
nsListControlFrame::GetHeightOfARow()
{
return HeightOfARow();
}
nsresult
nsListControlFrame::IsOptionDisabled(int32_t anIndex, bool &aIsDisabled)
{
nsRefPtr<dom::HTMLSelectElement> sel =
dom::HTMLSelectElement::FromContent(mContent);
if (sel) {
sel->IsOptionDisabled(anIndex, &aIsDisabled);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
//----------------------------------------------------------------------
// helper
//----------------------------------------------------------------------
bool
nsListControlFrame::IsLeftButton(nsIDOMEvent* aMouseEvent)
{
// only allow selection with the left button
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
if (mouseEvent) {
int16_t whichButton;
if (NS_SUCCEEDED(mouseEvent->GetButton(&whichButton))) {
return whichButton != 0?false:true;
}
}
return false;
}
nscoord
nsListControlFrame::CalcFallbackRowHeight(float aFontSizeInflation)
{
nscoord rowHeight = 0;
nsRefPtr<nsFontMetrics> fontMet;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fontMet),
aFontSizeInflation);
if (fontMet) {
rowHeight = fontMet->MaxHeight();
}
return rowHeight;
}
nscoord
nsListControlFrame::CalcIntrinsicHeight(nscoord aHeightOfARow,
int32_t aNumberOfOptions)
{
NS_PRECONDITION(!IsInDropDownMode(),
"Shouldn't be in dropdown mode when we call this");
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
if (select) {
mNumDisplayRows = select->Size();
} else {
mNumDisplayRows = 1;
}
if (mNumDisplayRows < 1) {
mNumDisplayRows = 4;
}
return mNumDisplayRows * aHeightOfARow;
}
//----------------------------------------------------------------------
// nsIDOMMouseListener
//----------------------------------------------------------------------
nsresult
nsListControlFrame::MouseUp(nsIDOMEvent* aMouseEvent)
{
NS_ASSERTION(aMouseEvent != nullptr, "aMouseEvent is null.");
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
UpdateInListState(aMouseEvent);
mButtonDown = false;
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
// only allow selection with the left button
// if a right button click is on the combobox itself
// or on the select when in listbox mode, then let the click through
if (!IsLeftButton(aMouseEvent)) {
if (IsInDropDownMode()) {
if (!IgnoreMouseEventForSelection(aMouseEvent)) {
aMouseEvent->PreventDefault();
aMouseEvent->StopPropagation();
} else {
CaptureMouseEvents(false);
return NS_OK;
}
CaptureMouseEvents(false);
return NS_ERROR_FAILURE; // means consume event
} else {
CaptureMouseEvents(false);
return NS_OK;
}
}
const nsStyleVisibility* vis = StyleVisibility();
if (!vis->IsVisible()) {
return NS_OK;
}
if (IsInDropDownMode()) {
// XXX This is a bit of a hack, but.....
// But the idea here is to make sure you get an "onclick" event when you mouse
// down on the select and the drag over an option and let go
// And then NOT get an "onclick" event when when you click down on the select
// and then up outside of the select
// the EventStateManager tracks the content of the mouse down and the mouse up
// to make sure they are the same, and the onclick is sent in the PostHandleEvent
// depeneding on whether the clickCount is non-zero.
// So we cheat here by either setting or unsetting the clcikCount in the native event
// so the right thing happens for the onclick event
WidgetMouseEvent* mouseEvent =
aMouseEvent->GetInternalNSEvent()->AsMouseEvent();
int32_t selectedIndex;
if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
// If it's disabled, disallow the click and leave.
bool isDisabled = false;
IsOptionDisabled(selectedIndex, isDisabled);
if (isDisabled) {
aMouseEvent->PreventDefault();
aMouseEvent->StopPropagation();
CaptureMouseEvents(false);
return NS_ERROR_FAILURE;
}
if (kNothingSelected != selectedIndex) {
nsWeakFrame weakFrame(this);
ComboboxFinish(selectedIndex);
if (!weakFrame.IsAlive())
return NS_OK;
FireOnChange();
}
mouseEvent->clickCount = 1;
} else {
// the click was out side of the select or its dropdown
mouseEvent->clickCount = IgnoreMouseEventForSelection(aMouseEvent) ? 1 : 0;
}
} else {
CaptureMouseEvents(false);
// Notify
if (mChangesSinceDragStart) {
// reset this so that future MouseUps without a prior MouseDown
// won't fire onchange
mChangesSinceDragStart = false;
FireOnChange();
}
}
return NS_OK;
}
void
nsListControlFrame::UpdateInListState(nsIDOMEvent* aEvent)
{
if (!mComboboxFrame || !mComboboxFrame->IsDroppedDown())
return;
nsPoint pt = nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(aEvent, this);
nsRect borderInnerEdge = GetScrollPortRect();
if (pt.y >= borderInnerEdge.y && pt.y < borderInnerEdge.YMost()) {
mItemSelectionStarted = true;
}
}
bool nsListControlFrame::IgnoreMouseEventForSelection(nsIDOMEvent* aEvent)
{
if (!mComboboxFrame)
return false;
// Our DOM listener does get called when the dropdown is not
// showing, because it listens to events on the SELECT element
if (!mComboboxFrame->IsDroppedDown())
return true;
return !mItemSelectionStarted;
}
#ifdef ACCESSIBILITY
void
nsListControlFrame::FireMenuItemActiveEvent()
{
if (mFocused != this && !IsInDropDownMode()) {
return;
}
nsCOMPtr<nsIContent> optionContent = GetCurrentOption();
if (!optionContent) {
return;
}
FireDOMEvent(NS_LITERAL_STRING("DOMMenuItemActive"), optionContent);
}
#endif
nsresult
nsListControlFrame::GetIndexFromDOMEvent(nsIDOMEvent* aMouseEvent,
int32_t& aCurIndex)
{
if (IgnoreMouseEventForSelection(aMouseEvent))
return NS_ERROR_FAILURE;
if (nsIPresShell::GetCapturingContent() != mContent) {
// If we're not capturing, then ignore movement in the border
nsPoint pt = nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(aMouseEvent, this);
nsRect borderInnerEdge = GetScrollPortRect();
if (!borderInnerEdge.Contains(pt)) {
return NS_ERROR_FAILURE;
}
}
nsRefPtr<dom::HTMLOptionElement> option;
for (nsCOMPtr<nsIContent> content =
PresContext()->EventStateManager()->GetEventTargetContent(nullptr);
content && !option;
content = content->GetParent()) {
option = dom::HTMLOptionElement::FromContent(content);
}
if (option) {
aCurIndex = option->Index();
MOZ_ASSERT(aCurIndex >= 0);
return NS_OK;
}
int32_t numOptions = GetNumberOfOptions();
if (numOptions < 1)
return NS_ERROR_FAILURE;
nsPoint pt = nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(aMouseEvent, this);
// If the event coordinate is above the first option frame, then target the
// first option frame
nsRefPtr<dom::HTMLOptionElement> firstOption = GetOption(0);
NS_ASSERTION(firstOption, "Can't find first option that's supposed to be there");
nsIFrame* optionFrame = firstOption->GetPrimaryFrame();
if (optionFrame) {
nsPoint ptInOptionFrame = pt - optionFrame->GetOffsetTo(this);
if (ptInOptionFrame.y < 0 && ptInOptionFrame.x >= 0 &&
ptInOptionFrame.x < optionFrame->GetSize().width) {
aCurIndex = 0;
return NS_OK;
}
}
nsRefPtr<dom::HTMLOptionElement> lastOption = GetOption(numOptions - 1);
// If the event coordinate is below the last option frame, then target the
// last option frame
NS_ASSERTION(lastOption, "Can't find last option that's supposed to be there");
optionFrame = lastOption->GetPrimaryFrame();
if (optionFrame) {
nsPoint ptInOptionFrame = pt - optionFrame->GetOffsetTo(this);
if (ptInOptionFrame.y >= optionFrame->GetSize().height && ptInOptionFrame.x >= 0 &&
ptInOptionFrame.x < optionFrame->GetSize().width) {
aCurIndex = numOptions - 1;
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
nsresult
nsListControlFrame::MouseDown(nsIDOMEvent* aMouseEvent)
{
NS_ASSERTION(aMouseEvent != nullptr, "aMouseEvent is null.");
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
UpdateInListState(aMouseEvent);
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
// only allow selection with the left button
// if a right button click is on the combobox itself
// or on the select when in listbox mode, then let the click through
if (!IsLeftButton(aMouseEvent)) {
if (IsInDropDownMode()) {
if (!IgnoreMouseEventForSelection(aMouseEvent)) {
aMouseEvent->PreventDefault();
aMouseEvent->StopPropagation();
} else {
return NS_OK;
}
return NS_ERROR_FAILURE; // means consume event
} else {
return NS_OK;
}
}
int32_t selectedIndex;
if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
// Handle Like List
mButtonDown = true;
CaptureMouseEvents(true);
nsWeakFrame weakFrame(this);
bool change =
HandleListSelection(aMouseEvent, selectedIndex); // might destroy us
if (!weakFrame.IsAlive()) {
return NS_OK;
}
mChangesSinceDragStart = change;
} else {
// NOTE: the combo box is responsible for dropping it down
if (mComboboxFrame) {
if (XRE_GetProcessType() == GeckoProcessType_Content && BrowserTabsRemote()) {
nsContentUtils::DispatchChromeEvent(mContent->OwnerDoc(), mContent,
NS_LITERAL_STRING("mozshowdropdown"), true,
false);
return NS_OK;
}
if (!IgnoreMouseEventForSelection(aMouseEvent)) {
return NS_OK;
}
if (!nsComboboxControlFrame::ToolkitHasNativePopup())
{
bool isDroppedDown = mComboboxFrame->IsDroppedDown();
nsIFrame* comboFrame = do_QueryFrame(mComboboxFrame);
nsWeakFrame weakFrame(comboFrame);
mComboboxFrame->ShowDropDown(!isDroppedDown);
if (!weakFrame.IsAlive())
return NS_OK;
if (isDroppedDown) {
CaptureMouseEvents(false);
}
}
}
}
return NS_OK;
}
//----------------------------------------------------------------------
// nsIDOMMouseMotionListener
//----------------------------------------------------------------------
nsresult
nsListControlFrame::MouseMove(nsIDOMEvent* aMouseEvent)
{
NS_ASSERTION(aMouseEvent, "aMouseEvent is null.");
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
UpdateInListState(aMouseEvent);
if (IsInDropDownMode()) {
if (mComboboxFrame->IsDroppedDown()) {
int32_t selectedIndex;
if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
PerformSelection(selectedIndex, false, false); // might destroy us
}
}
} else {// XXX - temporary until we get drag events
if (mButtonDown) {
return DragMove(aMouseEvent); // might destroy us
}
}
return NS_OK;
}
nsresult
nsListControlFrame::DragMove(nsIDOMEvent* aMouseEvent)
{
NS_ASSERTION(aMouseEvent, "aMouseEvent is null.");
UpdateInListState(aMouseEvent);
if (!IsInDropDownMode()) {
int32_t selectedIndex;
if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
// Don't waste cycles if we already dragged over this item
if (selectedIndex == mEndSelectionIndex) {
return NS_OK;
}
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
NS_ASSERTION(mouseEvent, "aMouseEvent is not an nsIDOMMouseEvent!");
bool isControl;
#ifdef XP_MACOSX
mouseEvent->GetMetaKey(&isControl);
#else
mouseEvent->GetCtrlKey(&isControl);
#endif
nsWeakFrame weakFrame(this);
// Turn SHIFT on when you are dragging, unless control is on.
bool wasChanged = PerformSelection(selectedIndex,
!isControl, isControl);
if (!weakFrame.IsAlive()) {
return NS_OK;
}
mChangesSinceDragStart = mChangesSinceDragStart || wasChanged;
}
}
return NS_OK;
}
//----------------------------------------------------------------------
// Scroll helpers.
//----------------------------------------------------------------------
void
nsListControlFrame::ScrollToIndex(int32_t aIndex)
{
if (aIndex < 0) {
// XXX shouldn't we just do nothing if we're asked to scroll to
// kNothingSelected?
ScrollTo(nsPoint(0, 0), nsIScrollableFrame::INSTANT);
} else {
nsRefPtr<dom::HTMLOptionElement> option =
GetOption(SafeCast<uint32_t>(aIndex));
if (option) {
ScrollToFrame(*option);
}
}
}
void
nsListControlFrame::ScrollToFrame(dom::HTMLOptionElement& aOptElement)
{
// otherwise we find the content's frame and scroll to it
nsIFrame* childFrame = aOptElement.GetPrimaryFrame();
if (childFrame) {
PresContext()->PresShell()->
ScrollFrameRectIntoView(childFrame,
nsRect(nsPoint(0, 0), childFrame->GetSize()),
nsIPresShell::ScrollAxis(), nsIPresShell::ScrollAxis(),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN |
nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY);
}
}
//---------------------------------------------------------------------
// Ok, the entire idea of this routine is to move to the next item that
// is suppose to be selected. If the item is disabled then we search in
// the same direction looking for the next item to select. If we run off
// the end of the list then we start at the end of the list and search
// backwards until we get back to the original item or an enabled option
//
// aStartIndex - the index to start searching from
// aNewIndex - will get set to the new index if it finds one
// aNumOptions - the total number of options in the list
// aDoAdjustInc - the initial increment 1-n
// aDoAdjustIncNext - the increment used to search for the next enabled option
//
// the aDoAdjustInc could be a "1" for a single item or
// any number greater representing a page of items
//
void
nsListControlFrame::AdjustIndexForDisabledOpt(int32_t aStartIndex,
int32_t &aNewIndex,
int32_t aNumOptions,
int32_t aDoAdjustInc,
int32_t aDoAdjustIncNext)
{
// Cannot select anything if there is nothing to select
if (aNumOptions == 0) {
aNewIndex = kNothingSelected;
return;
}
// means we reached the end of the list and now we are searching backwards
bool doingReverse = false;
// lowest index in the search range
int32_t bottom = 0;
// highest index in the search range
int32_t top = aNumOptions;
// Start off keyboard options at selectedIndex if nothing else is defaulted to
//
// XXX Perhaps this should happen for mouse too, to start off shift click
// automatically in multiple ... to do this, we'd need to override
// OnOptionSelected and set mStartSelectedIndex if nothing is selected. Not
// sure of the effects, though, so I'm not doing it just yet.
int32_t startIndex = aStartIndex;
if (startIndex < bottom) {
startIndex = GetSelectedIndex();
}
int32_t newIndex = startIndex + aDoAdjustInc;
// make sure we start off in the range
if (newIndex < bottom) {
newIndex = 0;
} else if (newIndex >= top) {
newIndex = aNumOptions-1;
}
while (1) {
// if the newIndex isn't disabled, we are golden, bail out
bool isDisabled = true;
if (NS_SUCCEEDED(IsOptionDisabled(newIndex, isDisabled)) && !isDisabled) {
break;
}
// it WAS disabled, so sart looking ahead for the next enabled option
newIndex += aDoAdjustIncNext;
// well, if we reach end reverse the search
if (newIndex < bottom) {
if (doingReverse) {
return; // if we are in reverse mode and reach the end bail out
} else {
// reset the newIndex to the end of the list we hit
// reverse the incrementer
// set the other end of the list to our original starting index
newIndex = bottom;
aDoAdjustIncNext = 1;
doingReverse = true;
top = startIndex;
}
} else if (newIndex >= top) {
if (doingReverse) {
return; // if we are in reverse mode and reach the end bail out
} else {
// reset the newIndex to the end of the list we hit
// reverse the incrementer
// set the other end of the list to our original starting index
newIndex = top - 1;
aDoAdjustIncNext = -1;
doingReverse = true;
bottom = startIndex;
}
}
}
// Looks like we found one
aNewIndex = newIndex;
}
nsAString&
nsListControlFrame::GetIncrementalString()
{
if (sIncrementalString == nullptr)
sIncrementalString = new nsString();
return *sIncrementalString;
}
void
nsListControlFrame::Shutdown()
{
delete sIncrementalString;
sIncrementalString = nullptr;
}
void
nsListControlFrame::DropDownToggleKey(nsIDOMEvent* aKeyEvent)
{
// Cocoa widgets do native popups, so don't try to show
// dropdowns there.
if (IsInDropDownMode() && !nsComboboxControlFrame::ToolkitHasNativePopup()) {
aKeyEvent->PreventDefault();
if (!mComboboxFrame->IsDroppedDown()) {
mComboboxFrame->ShowDropDown(true);
} else {
nsWeakFrame weakFrame(this);
// mEndSelectionIndex is the last item that got selected.
ComboboxFinish(mEndSelectionIndex);
if (weakFrame.IsAlive()) {
FireOnChange();
}
}
}
}
nsresult
nsListControlFrame::KeyDown(nsIDOMEvent* aKeyEvent)
{
MOZ_ASSERT(aKeyEvent, "aKeyEvent is null.");
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
AutoIncrementalSearchResetter incrementalSearchResetter;
// Don't check defaultPrevented value because other browsers don't prevent
// the key navigation of list control even if preventDefault() is called.
const WidgetKeyboardEvent* keyEvent =
aKeyEvent->GetInternalNSEvent()->AsKeyboardEvent();
MOZ_ASSERT(keyEvent,
"DOM event must have WidgetKeyboardEvent for its internal event");
if (keyEvent->IsAlt()) {
if (keyEvent->keyCode == NS_VK_UP || keyEvent->keyCode == NS_VK_DOWN) {
DropDownToggleKey(aKeyEvent);
}
return NS_OK;
}
// now make sure there are options or we are wasting our time
nsRefPtr<dom::HTMLOptionsCollection> options = GetOptions();
NS_ENSURE_TRUE(options, NS_ERROR_FAILURE);
uint32_t numOptions = options->Length();
// this is the new index to set
int32_t newIndex = kNothingSelected;
bool isControlOrMeta = (keyEvent->IsControl() || keyEvent->IsMeta());
// Don't try to handle multiple-select pgUp/pgDown in single-select lists.
if (isControlOrMeta && !GetMultiple() &&
(keyEvent->keyCode == NS_VK_PAGE_UP ||
keyEvent->keyCode == NS_VK_PAGE_DOWN)) {
return NS_OK;
}
if (isControlOrMeta && (keyEvent->keyCode == NS_VK_UP ||
keyEvent->keyCode == NS_VK_LEFT ||
keyEvent->keyCode == NS_VK_DOWN ||
keyEvent->keyCode == NS_VK_RIGHT ||
keyEvent->keyCode == NS_VK_HOME ||
keyEvent->keyCode == NS_VK_END)) {
// Don't go into multiple-select mode unless this list can handle it.
isControlOrMeta = mControlSelectMode = GetMultiple();
} else if (keyEvent->keyCode != NS_VK_SPACE) {
mControlSelectMode = false;
}
switch (keyEvent->keyCode) {
case NS_VK_UP:
case NS_VK_LEFT:
AdjustIndexForDisabledOpt(mEndSelectionIndex, newIndex,
static_cast<int32_t>(numOptions),
-1, -1);
break;
case NS_VK_DOWN:
case NS_VK_RIGHT:
AdjustIndexForDisabledOpt(mEndSelectionIndex, newIndex,
static_cast<int32_t>(numOptions),
1, 1);
break;
case NS_VK_RETURN:
if (IsInDropDownMode()) {
// If the select element is a dropdown style, Enter key should be
// consumed everytime since Enter key may be pressed accidentally after
// the dropdown is closed by Enter key press.
aKeyEvent->PreventDefault();
if (mComboboxFrame->IsDroppedDown()) {
nsWeakFrame weakFrame(this);
ComboboxFinish(mEndSelectionIndex);
if (!weakFrame.IsAlive()) {
return NS_OK;
}
}
// XXX This is strange. On other browsers, "change" event is fired
// immediately after the selected item is changed rather than
// Enter key is pressed.
FireOnChange();
return NS_OK;
}
// If this is single select listbox, Enter key doesn't cause anything.
if (!GetMultiple()) {
return NS_OK;
}
newIndex = mEndSelectionIndex;
break;
case NS_VK_ESCAPE: {
// If the select element is a listbox style, Escape key causes nothing.
if (!IsInDropDownMode()) {
return NS_OK;
}
AboutToRollup();
// If the select element is a dropdown style, Enter key should be
// consumed everytime since Escape key may be pressed accidentally after
// the dropdown is closed by Escepe key.
aKeyEvent->PreventDefault();
return NS_OK;
}
case NS_VK_PAGE_UP: {
int32_t itemsPerPage =
std::max(1, static_cast<int32_t>(mNumDisplayRows - 1));
AdjustIndexForDisabledOpt(mEndSelectionIndex, newIndex,
static_cast<int32_t>(numOptions),
-itemsPerPage, -1);
break;
}
case NS_VK_PAGE_DOWN: {
int32_t itemsPerPage =
std::max(1, static_cast<int32_t>(mNumDisplayRows - 1));
AdjustIndexForDisabledOpt(mEndSelectionIndex, newIndex,
static_cast<int32_t>(numOptions),
itemsPerPage, 1);
break;
}
case NS_VK_HOME:
AdjustIndexForDisabledOpt(0, newIndex,
static_cast<int32_t>(numOptions),
0, 1);
break;
case NS_VK_END:
AdjustIndexForDisabledOpt(static_cast<int32_t>(numOptions) - 1, newIndex,
static_cast<int32_t>(numOptions),
0, -1);
break;
#if defined(XP_WIN)
case NS_VK_F4:
if (!isControlOrMeta) {
DropDownToggleKey(aKeyEvent);
}
return NS_OK;
#endif
default: // printable key will be handled by keypress event.
incrementalSearchResetter.Cancel();
return NS_OK;
}
aKeyEvent->PreventDefault();
// Actually process the new index and let the selection code
// do the scrolling for us
PostHandleKeyEvent(newIndex, 0, keyEvent->IsShift(), isControlOrMeta);
return NS_OK;
}
nsresult
nsListControlFrame::KeyPress(nsIDOMEvent* aKeyEvent)
{
MOZ_ASSERT(aKeyEvent, "aKeyEvent is null.");
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
AutoIncrementalSearchResetter incrementalSearchResetter;
const WidgetKeyboardEvent* keyEvent =
aKeyEvent->GetInternalNSEvent()->AsKeyboardEvent();
MOZ_ASSERT(keyEvent,
"DOM event must have WidgetKeyboardEvent for its internal event");
// Select option with this as the first character
// XXX Not I18N compliant
// Don't do incremental search if the key event has already consumed.
if (keyEvent->mFlags.mDefaultPrevented) {
return NS_OK;
}
if (keyEvent->IsAlt()) {
return NS_OK;
}
// With some keyboard layout, space key causes non-ASCII space.
// So, the check in keydown event handler isn't enough, we need to check it
// again with keypress event.
if (keyEvent->charCode != ' ') {
mControlSelectMode = false;
}
bool isControlOrMeta = (keyEvent->IsControl() || keyEvent->IsMeta());
if (isControlOrMeta && keyEvent->charCode != ' ') {
return NS_OK;
}
// NOTE: If keyCode of keypress event is not 0, charCode is always 0.
// Therefore, all non-printable keys are not handled after this block.
if (!keyEvent->charCode) {
// Backspace key will delete the last char in the string. Otherwise,
// non-printable keypress should reset incremental search.
if (keyEvent->keyCode == NS_VK_BACK) {
incrementalSearchResetter.Cancel();
if (!GetIncrementalString().IsEmpty()) {
GetIncrementalString().Truncate(GetIncrementalString().Length() - 1);
}
aKeyEvent->PreventDefault();
} else {
// XXX When a select element has focus, even if the key causes nothing,
// it might be better to call preventDefault() here because nobody
// should expect one of other elements including chrome handles the
// key event.
}
return NS_OK;
}
incrementalSearchResetter.Cancel();
// We ate the key if we got this far.
aKeyEvent->PreventDefault();
// XXX Why don't we check/modify timestamp first?
// Incremental Search: if time elapsed is below
// INCREMENTAL_SEARCH_KEYPRESS_TIME, append this keystroke to the search
// string we will use to find options and start searching at the current
// keystroke. Otherwise, Truncate the string if it's been a long time
// since our last keypress.
if (keyEvent->time - gLastKeyTime > INCREMENTAL_SEARCH_KEYPRESS_TIME) {
// If this is ' ' and we are at the beginning of the string, treat it as
// "select this option" (bug 191543)
if (keyEvent->charCode == ' ') {
// Actually process the new index and let the selection code
// do the scrolling for us
PostHandleKeyEvent(mEndSelectionIndex, keyEvent->charCode,
keyEvent->IsShift(), isControlOrMeta);
return NS_OK;
}
GetIncrementalString().Truncate();
}
gLastKeyTime = keyEvent->time;
// Append this keystroke to the search string.
char16_t uniChar = ToLowerCase(static_cast<char16_t>(keyEvent->charCode));
GetIncrementalString().Append(uniChar);
// See bug 188199, if all letters in incremental string are same, just try to
// match the first one
nsAutoString incrementalString(GetIncrementalString());
uint32_t charIndex = 1, stringLength = incrementalString.Length();
while (charIndex < stringLength &&
incrementalString[charIndex] == incrementalString[charIndex - 1]) {
charIndex++;
}
if (charIndex == stringLength) {
incrementalString.Truncate(1);
stringLength = 1;
}
// Determine where we're going to start reading the string
// If we have multiple characters to look for, we start looking *at* the
// current option. If we have only one character to look for, we start
// looking *after* the current option.
// Exception: if there is no option selected to start at, we always start
// *at* 0.
int32_t startIndex = GetSelectedIndex();
if (startIndex == kNothingSelected) {
startIndex = 0;
} else if (stringLength == 1) {
startIndex++;
}
// now make sure there are options or we are wasting our time
nsRefPtr<dom::HTMLOptionsCollection> options = GetOptions();
NS_ENSURE_TRUE(options, NS_ERROR_FAILURE);
uint32_t numOptions = options->Length();
nsWeakFrame weakFrame(this);
for (uint32_t i = 0; i < numOptions; ++i) {
uint32_t index = (i + startIndex) % numOptions;
nsRefPtr<dom::HTMLOptionElement> optionElement =
options->ItemAsOption(index);
if (!optionElement || !optionElement->GetPrimaryFrame()) {
continue;
}
nsAutoString text;
if (NS_FAILED(optionElement->GetText(text)) ||
!StringBeginsWith(
nsContentUtils::TrimWhitespace<
nsContentUtils::IsHTMLWhitespaceOrNBSP>(text, false),
incrementalString, nsCaseInsensitiveStringComparator())) {
continue;
}
bool wasChanged = PerformSelection(index, keyEvent->IsShift(), isControlOrMeta);
if (!weakFrame.IsAlive()) {
return NS_OK;
}
if (!wasChanged) {
break;
}
// If UpdateSelection() returns false, that means the frame is no longer
// alive. We should stop doing anything.
if (!UpdateSelection()) {
return NS_OK;
}
break;
}
return NS_OK;
}
void
nsListControlFrame::PostHandleKeyEvent(int32_t aNewIndex,
uint32_t aCharCode,
bool aIsShift,
bool aIsControlOrMeta)
{
if (aNewIndex == kNothingSelected) {
return;
}
// If you hold control, but not shift, no key will actually do anything
// except space.
nsWeakFrame weakFrame(this);
bool wasChanged = false;
if (aIsControlOrMeta && !aIsShift && aCharCode != ' ') {
mStartSelectionIndex = aNewIndex;
mEndSelectionIndex = aNewIndex;
InvalidateFocus();
ScrollToIndex(aNewIndex);
if (!weakFrame.IsAlive()) {
return;
}
#ifdef ACCESSIBILITY
FireMenuItemActiveEvent();
#endif
} else if (mControlSelectMode && aCharCode == ' ') {
wasChanged = SingleSelection(aNewIndex, true);
} else {
wasChanged = PerformSelection(aNewIndex, aIsShift, aIsControlOrMeta);
}
if (wasChanged && weakFrame.IsAlive()) {
// dispatch event, update combobox, etc.
UpdateSelection();
}
}
/******************************************************************************
* nsListEventListener
*****************************************************************************/
NS_IMPL_ISUPPORTS(nsListEventListener, nsIDOMEventListener)
NS_IMETHODIMP
nsListEventListener::HandleEvent(nsIDOMEvent* aEvent)
{
if (!mFrame)
return NS_OK;
nsAutoString eventType;
aEvent->GetType(eventType);
if (eventType.EqualsLiteral("keydown"))
return mFrame->nsListControlFrame::KeyDown(aEvent);
if (eventType.EqualsLiteral("keypress"))
return mFrame->nsListControlFrame::KeyPress(aEvent);
if (eventType.EqualsLiteral("mousedown"))
return mFrame->nsListControlFrame::MouseDown(aEvent);
if (eventType.EqualsLiteral("mouseup"))
return mFrame->nsListControlFrame::MouseUp(aEvent);
if (eventType.EqualsLiteral("mousemove"))
return mFrame->nsListControlFrame::MouseMove(aEvent);
NS_ABORT();
return NS_OK;
}
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