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pjs/layout/forms/nsComboboxControlFrame.cpp

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34 KiB
C++
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsCOMPtr.h"
#include "nsComboboxControlFrame.h"
#include "nsFormFrame.h"
#include "nsFormControlFrame.h"
#include "nsIHTMLContent.h"
#include "nsHTMLIIDs.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLParts.h"
#include "nsIFormControl.h"
#include "nsINameSpaceManager.h"
#include "nsIDOMEventReceiver.h"
#include "nsLayoutAtoms.h"
#include "nsIDOMElement.h"
#include "nsListControlFrame.h"
#include "nsIListControlFrame.h"
#include "nsIDOMHTMLCollection.h"
#include "nsIDOMHTMLSelectElement.h"
#include "nsIDOMHTMLOptionElement.h"
#include "nsIPresShell.h"
#include "nsISupportsArray.h"
#include "nsIDeviceContext.h"
#include "nsIView.h"
static NS_DEFINE_IID(kIFormControlFrameIID, NS_IFORMCONTROLFRAME_IID);
static NS_DEFINE_IID(kIComboboxControlFrameIID, NS_ICOMBOBOXCONTROLFRAME_IID);
static NS_DEFINE_IID(kIListControlFrameIID, NS_ILISTCONTROLFRAME_IID);
static NS_DEFINE_IID(kIDOMMouseListenerIID, NS_IDOMMOUSELISTENER_IID);
static NS_DEFINE_IID(kIFrameIID, NS_IFRAME_IID);
static NS_DEFINE_IID(kIAnonymousContentCreatorIID, NS_IANONYMOUS_CONTENT_CREATOR_IID);
// Drop down list event management.
// The combo box uses the following strategy for managing the
// drop-down list.
// If the combo box or it's arrow button is clicked on the drop-down list is displayed
// If mouse exit's the combo box with the drop-down list displayed the drop-down list
// is asked to capture events
// The drop-down list will capture all events including mouse down and up and will always
// return with ListWasSelected method call regardless of whether an item in the list was
// actually selected.
// The ListWasSelected code will turn off mouse-capture for the drop-down list.
// The drop-down list does not explicitly set capture when it is in the drop-down mode.
//XXX: This is temporary. It simulates psuedo states by using a attribute selector on
const char * kMozDropdownActive = "-moz-dropdown-active";
nsresult
NS_NewComboboxControlFrame(nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsComboboxControlFrame* it = new nsComboboxControlFrame;
if (!it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
nsComboboxControlFrame::nsComboboxControlFrame()
: nsAreaFrame()
{
mPresContext = nsnull;
mFormFrame = nsnull;
mListControlFrame = nsnull;
mTextStr = "";
mDisplayContent = nsnull;
mButtonContent = nsnull;
mDroppedDown = PR_FALSE;
mDisplayFrame = nsnull;
mButtonFrame = nsnull;
mDropdownFrame = nsnull;
//Shrink the area around it's contents
SetFlags(NS_BLOCK_SHRINK_WRAP);
}
//--------------------------------------------------------------
nsComboboxControlFrame::~nsComboboxControlFrame()
{
mFormFrame = nsnull;
NS_IF_RELEASE(mPresContext);
NS_IF_RELEASE(mDisplayContent);
NS_IF_RELEASE(mButtonContent);
}
//--------------------------------------------------------------
nsresult
nsComboboxControlFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
NS_PRECONDITION(0 != aInstancePtr, "null ptr");
if (NULL == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kIComboboxControlFrameIID)) {
*aInstancePtr = (void*) ((nsIComboboxControlFrame*) this);
return NS_OK;
}
if (aIID.Equals(kIFormControlFrameIID)) {
*aInstancePtr = (void*) ((nsIFormControlFrame*) this);
return NS_OK;
} else if (aIID.Equals(kIDOMMouseListenerIID)) {
*aInstancePtr = (void*)(nsIDOMMouseListener*) this;
NS_ADDREF_THIS();
return NS_OK;
} else if (aIID.Equals(kIAnonymousContentCreatorIID)) {
*aInstancePtr = (void*)(nsIAnonymousContentCreator*) this;
NS_ADDREF_THIS();
return NS_OK;
}
return nsAreaFrame::QueryInterface(aIID, aInstancePtr);
}
NS_IMETHODIMP
nsComboboxControlFrame::Init(nsIPresContext& aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
// Need to hold on the pres context because it is used later in methods
// which don't have it passed in.
mPresContext = &aPresContext;
NS_ADDREF(mPresContext);
return nsAreaFrame::Init(aPresContext, aContent, aParent, aContext, aPrevInFlow);
}
//--------------------------------------------------------------
PRBool
nsComboboxControlFrame::IsSuccessful(nsIFormControlFrame* aSubmitter)
{
nsAutoString name;
return (NS_CONTENT_ATTR_HAS_VALUE == GetName(&name));
}
// Initialize the text string in the combobox using either the current
// selection in the list box or the first item item in the list box.
void
nsComboboxControlFrame::InitTextStr(PRBool aUpdate)
{
nsIFormControlFrame* fcFrame = nsnull;
nsIFrame* dropdownFrame = GetDropdownFrame();
nsresult result = dropdownFrame->QueryInterface(kIFormControlFrameIID, (void**)&fcFrame);
// Reset the list, so we can ask it for it's selected item.
fcFrame->Reset();
// Update the selected text string
mListControlFrame->GetSelectedItem(mTextStr);
if (mTextStr == "") {
// No selection so use the first item in the list box
if ((NS_OK == result) && (nsnull != fcFrame)) {
// Set listbox selection to first item in the list box
fcFrame->SetProperty(nsHTMLAtoms::selectedindex, "0");
// Get the listbox selection as a string
mListControlFrame->GetSelectedItem(mTextStr);
}
}
// Update the display by setting the value attribute
mDisplayContent->SetAttribute(kNameSpaceID_None, nsHTMLAtoms::value, mTextStr, aUpdate);
}
//--------------------------------------------------------------
// Reset the combo box back to it original state.
void
nsComboboxControlFrame::Reset()
{
// Reset the dropdown list to its original state
nsIFormControlFrame* fcFrame = nsnull;
nsIFrame* dropdownFrame = GetDropdownFrame();
nsresult result = dropdownFrame->QueryInterface(kIFormControlFrameIID, (void**)&fcFrame);
if ((NS_OK == result) && (nsnull != fcFrame)) {
fcFrame->Reset();
}
// Update the combobox using the text string returned from the dropdown list
InitTextStr(PR_TRUE);
}
void
nsComboboxControlFrame::PostCreateWidget(nsIPresContext* aPresContext,
nscoord& aWidth,
nscoord& aHeight)
{
Reset();
}
//--------------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::GetType(PRInt32* aType) const
{
*aType = NS_FORM_SELECT;
return NS_OK;
}
//--------------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::GetFormContent(nsIContent*& aContent) const
{
nsIContent* content;
nsresult rv;
rv = GetContent(&content);
aContent = content;
return rv;
}
//--------------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::GetFont(nsIPresContext* aPresContext,
nsFont& aFont)
{
nsFormControlHelper::GetFont(this, aPresContext, mStyleContext, aFont);
return NS_OK;
}
//--------------------------------------------------------------
nscoord
nsComboboxControlFrame::GetVerticalBorderWidth(float aPixToTwip) const
{
return 0;
}
//--------------------------------------------------------------
nscoord
nsComboboxControlFrame::GetHorizontalBorderWidth(float aPixToTwip) const
{
return 0;
}
//--------------------------------------------------------------
nscoord
nsComboboxControlFrame::GetVerticalInsidePadding(float aPixToTwip,
nscoord aInnerHeight) const
{
return 0;
}
//--------------------------------------------------------------
nscoord
nsComboboxControlFrame::GetHorizontalInsidePadding(nsIPresContext& aPresContext,
float aPixToTwip,
nscoord aInnerWidth,
nscoord aCharWidth) const
{
return 0;
}
void
nsComboboxControlFrame::SetFocus(PRBool aOn, PRBool aRepaint)
{
//XXX: TODO Implement focus for combobox.
}
// Toggle dropdown list.
void
nsComboboxControlFrame::ToggleList(nsIPresContext* aPresContext)
{
if (PR_TRUE == mDroppedDown) {
ShowList(aPresContext, PR_FALSE);
} else {
ShowList(aPresContext, PR_TRUE);
}
}
void
nsComboboxControlFrame::ShowPopup(PRBool aShowPopup)
{
//XXX: This is temporary. It simulates a psuedo dropdown states by using a attribute selector
// This will not be need if the event state supports active states for use with the dropdown list
// Currently, the event state manager will reset the active state to the content which has focus
// which causes the active state to be removed from the event state manager immediately after it
// it the select is set to the active state.
nsCOMPtr<nsIAtom> activeAtom ( dont_QueryInterface(NS_NewAtom(kMozDropdownActive)));
if (PR_TRUE == aShowPopup) {
mContent->SetAttribute(kNameSpaceID_None, activeAtom, "", PR_TRUE);
} else {
mContent->UnsetAttribute(kNameSpaceID_None, activeAtom, PR_TRUE);
}
}
// Show the dropdown list
void
nsComboboxControlFrame::ShowList(nsIPresContext* aPresContext, PRBool aShowList)
{
if (PR_TRUE == aShowList) {
mListControlFrame->AboutToDropDown();
ShowPopup(PR_TRUE);
mDroppedDown = PR_TRUE;
// The listcontrol frame will call back to the nsComboboxControlFrame's ListWasSelected
// which will stop the capture.
mListControlFrame->CaptureMouseEvents(PR_TRUE);
} else {
ShowPopup(PR_FALSE);
mDroppedDown = PR_FALSE;
}
}
//-------------------------------------------------------------
// this is in response to the MouseClick from the containing browse button
// XXX: TODO still need to get filters from accept attribute
void
nsComboboxControlFrame::MouseClicked(nsIPresContext* aPresContext)
{
ToggleList(aPresContext);
}
nsresult
nsComboboxControlFrame::ReflowComboChildFrame(nsIFrame* aFrame,
nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus,
nscoord aAvailableWidth,
nscoord aAvailableHeight)
{
// Constrain the child's width and height to aAvailableWidth and aAvailableHeight
nsSize availSize(aAvailableWidth, aAvailableHeight);
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aFrame,
availSize);
kidReflowState.computedWidth = aAvailableWidth;
kidReflowState.computedHeight = aAvailableHeight;
// Reflow child
nsresult rv = ReflowChild(aFrame, aPresContext, aDesiredSize, kidReflowState, aStatus);
// Set the child's width and height to it's desired size
nsRect rect;
aFrame->GetRect(rect);
rect.width = aDesiredSize.width;
rect.height = aDesiredSize.height;
aFrame->SetRect(rect);
return rv;
}
// Suggest a size for the child frame.
// Only frames which implement the nsIFormControlFrame interface and
// honor the SetSuggestedSize method will be placed and sized correctly.
void
nsComboboxControlFrame::SetChildFrameSize(nsIFrame* aFrame, nscoord aWidth, nscoord aHeight)
{
nsIFormControlFrame* fcFrame = nsnull;
nsresult result = aFrame->QueryInterface(kIFormControlFrameIID, (void**)&fcFrame);
if (NS_SUCCEEDED(result) && (nsnull != fcFrame)) {
fcFrame->SetSuggestedSize(aWidth, aHeight);
}
}
nsresult
nsComboboxControlFrame::GetPrimaryComboFrame(nsIPresContext& aPresContext, nsIContent* aContent, nsIFrame** aFrame)
{
nsresult rv = NS_OK;
// Get the primary frame from the presentation shell.
nsCOMPtr<nsIPresShell> presShell;
rv = aPresContext.GetShell(getter_AddRefs(presShell));
if (NS_SUCCEEDED(rv) && presShell) {
presShell->GetPrimaryFrameFor(aContent, aFrame);
}
return rv;
}
nsIFrame*
nsComboboxControlFrame::GetButtonFrame(nsIPresContext& aPresContext)
{
if (mButtonFrame == nsnull) {
NS_ASSERTION(mButtonContent != nsnull, "nsComboboxControlFrame mButtonContent is null");
GetPrimaryComboFrame(aPresContext, mButtonContent, &mButtonFrame);
}
return mButtonFrame;
}
nsIFrame*
nsComboboxControlFrame::GetDisplayFrame(nsIPresContext& aPresContext)
{
if (mDisplayFrame == nsnull) {
NS_ASSERTION(mDisplayContent != nsnull, "nsComboboxControlFrame mDisplayContent is null");
GetPrimaryComboFrame(aPresContext, mDisplayContent, &mDisplayFrame);
}
return mDisplayFrame;
}
nsIFrame*
nsComboboxControlFrame::GetDropdownFrame()
{
return mDropdownFrame;
}
nsresult
nsComboboxControlFrame::GetScreenHeight(nsIPresContext& aPresContext,
nscoord& aHeight)
{
aHeight = 0;
nsIDeviceContext* context;
aPresContext.GetDeviceContext( &context );
if ( nsnull != context )
{
PRInt32 height;
PRInt32 width;
context->GetDeviceSurfaceDimensions(width, height);
float devUnits;
context->GetDevUnitsToAppUnits(devUnits);
aHeight = NSToIntRound(float( height) / devUnits );
NS_RELEASE( context );
return NS_OK;
}
return NS_ERROR_FAILURE;
}
nsresult
nsComboboxControlFrame::PositionDropdown(nsIPresContext& aPresContext,
nscoord aHeight,
nsRect aAbsoluteTwipsRect,
nsRect aAbsolutePixelRect)
{
// Position the dropdown list. It is positioned below the display frame if there is enough
// room on the screen to display the entire list. Otherwise it is placed above the display
// frame.
// Note: As first glance, it appears that you could simply get the absolute bounding box for the
// dropdown list by first getting it's view, then getting the view's nsIWidget, then asking the nsIWidget
// for it's AbsoluteBounds. The problem with this approach, is that the dropdown lists y location can
// change based on whether the dropdown is placed below or above the display frame.
// The approach, taken here is to get use the absolute position of the display frame and use it's location
// to determine if the dropdown will go offscreen.
// Use the height calculated for the area frame so it includes both
// the display and button heights.
nsresult rv = NS_OK;
nsIFrame* dropdownFrame = GetDropdownFrame();
nscoord dropdownYOffset = aHeight;
/* XXX: Enable this code to debug popping up above the display frame, rather than below it
nscoord screenHeightInPixels = 0;
if (NS_SUCCEEDED(GetScreenHeight(aPresContext, screenHeightInPixels))) {
nsRect absoluteRect;
// Get the height of the dropdown list in pixels.
nsRect dropdownRect;
dropdownFrame->GetRect(dropdownRect);
float t2p;
aPresContext.GetTwipsToPixels(&t2p);
nscoord absoluteDropDownHeight = NSTwipsToIntPixels(dropdownRect.height, t2p);
// Check to see if the drop-down list will go offscreen
if (NS_SUCCEEDED(rv) && ((aAbsolutePixelRect.y + aAbsolutePixelRect.height + absoluteDropDownHeight) > screenHeightInPixels)) {
// move the dropdown list up
dropdownYOffset = - (aAbsoluteTwipsRect.height);
}
}
*/
nsRect dropdownRect;
dropdownFrame->GetRect(dropdownRect);
dropdownRect.x = 0;
dropdownRect.y = dropdownYOffset;
dropdownFrame->SetRect(dropdownRect);
return rv;
}
// Calculate a frame's position in screen coordinates
nsresult
nsComboboxControlFrame::GetAbsoluteFramePosition(nsIPresContext& aPresContext,
nsIFrame *aFrame,
nsRect& aAbsoluteTwipsRect,
nsRect& aAbsolutePixelRect)
{
//XXX: This code needs to take the view's offset into account when calculating
//the absolute coordinate of the frame.
nsresult rv = NS_OK;
aFrame->GetRect(aAbsoluteTwipsRect);
// Get conversions between twips and pixels
float t2p;
float p2t;
aPresContext.GetTwipsToPixels(&t2p);
aPresContext.GetPixelsToTwips(&p2t);
// Add in frame's offset from it it's containing view
nsIView *containingView = nsnull;
nsPoint offset;
rv = aFrame->GetOffsetFromView(offset, &containingView);
if (NS_SUCCEEDED(rv) && (nsnull != containingView)) {
aAbsoluteTwipsRect.x += offset.x;
aAbsoluteTwipsRect.y += offset.y;
// Addin the containing view's offset form it's containing widget
nsIWidget* widget = nsnull;
nscoord widgetx = 0;
nscoord widgety = 0;
rv = containingView->GetOffsetFromWidget(&widgetx, &widgety, widget);
if (NS_SUCCEEDED(rv) && (nsnull != widget)) {
aAbsoluteTwipsRect.x += widgetx;
aAbsoluteTwipsRect.y += widgety;
// Add in the absolute offset of the widget.
nsRect absBounds;
widget->GetAbsoluteBounds(absBounds);
// Convert widget coordinates to twips
aAbsoluteTwipsRect.x += NSIntPixelsToTwips(absBounds.x, p2t);
aAbsoluteTwipsRect.y += NSIntPixelsToTwips(absBounds.y, p2t);
NS_RELEASE(widget);
}
}
// convert to pixel coordinates
if (NS_SUCCEEDED(rv)) {
aAbsolutePixelRect.x = NSTwipsToIntPixels(aAbsoluteTwipsRect.x, t2p);
aAbsolutePixelRect.y = NSTwipsToIntPixels(aAbsoluteTwipsRect.y, t2p);
aAbsolutePixelRect.width = NSTwipsToIntPixels(aAbsoluteTwipsRect.width, t2p);
aAbsolutePixelRect.height = NSTwipsToIntPixels(aAbsoluteTwipsRect.height, t2p);
}
return rv;
}
NS_IMETHODIMP
nsComboboxControlFrame::Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
nsIFrame* buttonFrame = GetButtonFrame(aPresContext);
nsIFrame* displayFrame = GetDisplayFrame(aPresContext);
nsIFrame* dropdownFrame = GetDropdownFrame();
// Don't try to do any special sizing and positioning unless all of the frames
// have been created.
if ((nsnull == displayFrame) ||
(nsnull == buttonFrame) ||
(nsnull == dropdownFrame))
{
// Since combobox frames are missing just do a normal area frame reflow
return nsAreaFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
}
// size of each part of the combo box
nsRect displayRect;
nsRect buttonRect;
nsRect dropdownRect;
if (!mFormFrame && (eReflowReason_Initial == aReflowState.reason)) {
nsFormFrame::AddFormControlFrame(aPresContext, *this);
}
// Get the current sizes of the combo box child frames
displayFrame->GetRect(displayRect);
buttonFrame->GetRect(buttonRect);
dropdownFrame->GetRect(dropdownRect);
nsHTMLReflowState firstPassState(aReflowState);
// Only reflow the display and button if they are the target of
// the incremental reflow, unless they change size. If they do
// then everything needs to be reflowed.
if (eReflowReason_Incremental == firstPassState.reason) {
nsIFrame* targetFrame;
firstPassState.reflowCommand->GetTarget(targetFrame);
if ((targetFrame == buttonFrame) || (targetFrame == displayFrame)) {
nsRect oldDisplayRect = displayRect;
nsRect oldButtonRect = buttonRect;
rv = nsAreaFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
displayFrame->GetRect(displayRect);
buttonFrame->GetRect(buttonRect);
if ((oldDisplayRect == displayRect) && (oldButtonRect == buttonRect)) {
// Reposition the popup.
nsRect absoluteTwips;
nsRect absolutePixels;
GetAbsoluteFramePosition(aPresContext, displayFrame, absoluteTwips, absolutePixels);
PositionDropdown(aPresContext, displayRect.height, absoluteTwips, absolutePixels);
return rv;
}
}
nsIReflowCommand::ReflowType type;
aReflowState.reflowCommand->GetType(type);
firstPassState.reason = eReflowReason_StyleChange;
firstPassState.reflowCommand = nsnull;
}
//Set the desired size for the button and display frame
if (NS_UNCONSTRAINEDSIZE == firstPassState.computedWidth) {
// A width has not been specified for the select so size the display area to
// match the width of the longest item in the drop-down list. The dropdown
// list has already been reflowed and sized to shrink around its contents above.
// Reflow the dropdown shrink-wrapped.
nsHTMLReflowMetrics dropdownDesiredSize(aDesiredSize);
ReflowComboChildFrame(dropdownFrame, aPresContext, dropdownDesiredSize, firstPassState, aStatus, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
dropdownFrame->GetRect(dropdownRect);
// Get maximum size and height of a option in the dropdown
nsSize size;
mListControlFrame->GetMaximumSize(size);
// Set width of display to match width of the drop down
SetChildFrameSize(displayFrame, dropdownRect.width, size.height);
// Size the button to be the same height as the displayFrame
SetChildFrameSize(buttonFrame, size.height, size.height);
// Reflow display + button
nsAreaFrame::Reflow(aPresContext, aDesiredSize, firstPassState, aStatus);
displayFrame->GetRect(displayRect);
// Reflow the dropdown list to match the width of the display + button
ReflowComboChildFrame(dropdownFrame, aPresContext, dropdownDesiredSize, firstPassState, aStatus, aDesiredSize.width, NS_UNCONSTRAINEDSIZE);
dropdownFrame->GetRect(dropdownRect);
} else {
// A width has been specified for the select.
// Make the display frame's width + button frame width = the width specified.
nsHTMLReflowMetrics dropdownDesiredSize(aDesiredSize);
ReflowComboChildFrame(dropdownFrame, aPresContext, dropdownDesiredSize, firstPassState, aStatus, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
// Get unconstrained size of the dropdown list.
nsSize size;
mListControlFrame->GetMaximumSize(size);
// Size the button to be the same height as the displayFrame
SetChildFrameSize(buttonFrame, size.height, size.height);
// Compute display width
buttonFrame->GetRect(buttonRect);
nscoord displayWidth;
displayWidth = firstPassState.computedWidth - buttonRect.width;
// Set the displayFrame to match the displayWidth computed above
SetChildFrameSize(displayFrame, displayWidth, size.height);
// Reflow again with the width of the display frame set.
nsAreaFrame::Reflow(aPresContext, aDesiredSize, firstPassState, aStatus);
// Reflow the dropdown list to match the width of the display + button
ReflowComboChildFrame(dropdownFrame, aPresContext, dropdownDesiredSize, firstPassState, aStatus, aDesiredSize.width, NS_UNCONSTRAINEDSIZE);
}
nsRect absoluteTwips;
nsRect absolutePixels;
GetAbsoluteFramePosition(aPresContext, displayFrame, absoluteTwips, absolutePixels);
PositionDropdown(aPresContext, aDesiredSize.height, absoluteTwips, absolutePixels);
return rv;
}
//--------------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::GetName(nsString* aResult)
{
nsresult result = NS_FORM_NOTOK;
if (mContent) {
nsIHTMLContent* formControl = nsnull;
result = mContent->QueryInterface(kIHTMLContentIID, (void**)&formControl);
if ((NS_OK == result) && formControl) {
nsHTMLValue value;
result = formControl->GetHTMLAttribute(nsHTMLAtoms::name, value);
if (NS_CONTENT_ATTR_HAS_VALUE == result) {
if (eHTMLUnit_String == value.GetUnit()) {
value.GetStringValue(*aResult);
}
}
NS_RELEASE(formControl);
}
}
return result;
}
PRInt32
nsComboboxControlFrame::GetMaxNumValues()
{
return 1;
}
PRBool
nsComboboxControlFrame::GetNamesValues(PRInt32 aMaxNumValues, PRInt32& aNumValues,
nsString* aValues, nsString* aNames)
{
nsAutoString name;
nsresult result = GetName(&name);
if ((aMaxNumValues <= 0) || (NS_CONTENT_ATTR_HAS_VALUE != result)) {
return PR_FALSE;
}
// use our name and the text widgets value
aNames[0] = name;
aValues[0] = mTextStr;
aNumValues = 1;
nsresult status = PR_TRUE;
return status;
}
//--------------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("ComboboxControl", aResult);
}
NS_IMETHODIMP
nsComboboxControlFrame::ReResolveStyleContext(nsIPresContext* aPresContext,
nsIStyleContext* aParentContext,
PRInt32 aParentChange,
nsStyleChangeList* aChangeList,
PRInt32* aLocalChange)
{
PRInt32 ourChange = aParentChange;
nsresult rv = nsAreaFrame::ReResolveStyleContext(aPresContext, aParentContext, aParentChange, aChangeList, aLocalChange);
if (NS_FAILED(rv)) {
return rv;
}
if (aLocalChange) {
*aLocalChange = ourChange;
}
if (NS_COMFALSE != rv) {
PRInt32 childChange;
// Update child list
nsIFrame* dropdownFrame = GetDropdownFrame();
dropdownFrame->ReResolveStyleContext(aPresContext, mStyleContext, ourChange, aChangeList, &childChange);
}
return rv;
}
nsresult
nsComboboxControlFrame::MouseDown(nsIDOMEvent* aMouseEvent)
{
ToggleList(mPresContext);
return NS_OK;
}
//----------------------------------------------------------------------
// nsIComboboxControlFrame
//----------------------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::SetDropDown(nsIFrame* aDropDownFrame)
{
mDropdownFrame = aDropDownFrame;
if (NS_OK != mDropdownFrame->QueryInterface(kIListControlFrameIID, (void**)&mListControlFrame)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
void
nsComboboxControlFrame::SelectionChanged()
{
if (nsnull != mDisplayContent) {
mDisplayContent->SetAttribute(kNameSpaceID_None, nsHTMLAtoms::value, mTextStr, PR_TRUE);
}
// Dispatch the NS_FORM_CHANGE event
nsEventStatus status = nsEventStatus_eIgnore;
nsGUIEvent event;
event.eventStructType = NS_GUI_EVENT;
event.widget = nsnull;
event.message = NS_FORM_CHANGE;
// Have the content handle the event.
mContent->HandleDOMEvent(*mPresContext, &event, nsnull, NS_EVENT_FLAG_INIT, status);
// Now have the frame handle the event
nsIFrame* frame = nsnull;
nsIFrame* dropdownFrame = GetDropdownFrame();
nsresult result = dropdownFrame->QueryInterface(kIFrameIID, (void**)&frame);
if ((NS_SUCCEEDED(result)) && (nsnull != frame)) {
frame->HandleEvent(*mPresContext, &event, status);
}
}
NS_IMETHODIMP
nsComboboxControlFrame::ListWasSelected(nsIPresContext* aPresContext)
{
ShowList(aPresContext, PR_FALSE);
mListControlFrame->CaptureMouseEvents(PR_FALSE);
nsString str;
if (nsnull != mListControlFrame) {
mListControlFrame->GetSelectedItem(str);
// Check to see if the selection changed
if (PR_FALSE == str.Equals(mTextStr)) {
mTextStr = str;
//XXX:TODO look at the ordinal position of the selected content in the listbox to tell
// if the selection has changed, rather than looking at the text string.
// There may be more than one item in the dropdown list with the same label.
SelectionChanged();
}
}
return NS_OK;
}
nsresult
nsComboboxControlFrame::RequiresWidget(PRBool& aRequiresWidget)
{
aRequiresWidget = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
nsComboboxControlFrame::SetProperty(nsIAtom* aName, const nsString& aValue)
{
nsIFormControlFrame* fcFrame = nsnull;
nsIFrame* dropdownFrame = GetDropdownFrame();
nsresult result = dropdownFrame->QueryInterface(kIFormControlFrameIID, (void**)&fcFrame);
if ((NS_SUCCEEDED(result)) && (nsnull != fcFrame)) {
return fcFrame->SetProperty(aName, aValue);
}
return result;
}
NS_IMETHODIMP
nsComboboxControlFrame::GetProperty(nsIAtom* aName, nsString& aValue)
{
nsIFormControlFrame* fcFrame = nsnull;
nsIFrame* dropdownFrame = GetDropdownFrame();
nsresult result = dropdownFrame->QueryInterface(kIFormControlFrameIID, (void**)&fcFrame);
if ((NS_SUCCEEDED(result)) && (nsnull != fcFrame)) {
return fcFrame->GetProperty(aName, aValue);
}
return result;
}
NS_IMETHODIMP
nsComboboxControlFrame::CreateAnonymousContent(nsISupportsArray& aChildList)
{
// The frames used to display the combo box and the button used to popup the dropdown list
// are created through anonymous content. The dropdown list is not created through anonymous
// content because it's frame is initialized specifically for the drop-down case and it is placed
// a special list referenced through NS_COMBO_FRAME_POPUP_LIST_INDEX to keep separate from the
// layout of the display and button.
//
// Note: The value attribute of the display content is set when an item is selected in the dropdown list.
// If the content specified below does not honor the value attribute than nothing will be displayed.
// In addition, if the frame created by content below for does not implement the nsIFormControlFrame
// interface and honor the SetSuggestedSize method the placement and size of the display area will not
// match what is normally desired for a combobox.
// For now the content that is created corresponds to two input buttons. It would be better to create the
// tag as something other than input, but then there isn't any way to create a button frame since it
// isn't possible to set the display type in CSS2 to create a button frame.
// create content used for display
nsIAtom* tag = NS_NewAtom("input");
NS_NewHTMLInputElement(&mDisplayContent, tag);
NS_ADDREF(mDisplayContent);
mDisplayContent->SetAttribute(kNameSpaceID_None, nsHTMLAtoms::type, nsAutoString("button"), PR_FALSE);
//XXX: Do not use nsHTMLAtoms::id use nsHTMLAtoms::kClass instead. There will end up being multiple
//ids set to the same value which is illegal.
mDisplayContent->SetAttribute(kNameSpaceID_None, nsHTMLAtoms::id, nsAutoString("-moz-display"), PR_FALSE);
aChildList.AppendElement(mDisplayContent);
// create button which drops the list down
tag = NS_NewAtom("input");
NS_NewHTMLInputElement(&mButtonContent, tag);
NS_ADDREF(mButtonContent);
mButtonContent->SetAttribute(kNameSpaceID_None, nsHTMLAtoms::type, nsAutoString("button"), PR_FALSE);
aChildList.AppendElement(mButtonContent);
// get the reciever interface from the browser button's content node
nsCOMPtr<nsIDOMEventReceiver> reciever(do_QueryInterface(mButtonContent));
// 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.
reciever->AddEventListenerByIID(this, kIDOMMouseListenerIID);
// get the reciever interface from the browser button's content node
nsCOMPtr<nsIDOMEventReceiver> displayReciever(do_QueryInterface(mDisplayContent));
// 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.
displayReciever->AddEventListenerByIID(this, kIDOMMouseListenerIID);
return NS_OK;
}
NS_IMETHODIMP
nsComboboxControlFrame::SetSuggestedSize(nscoord aWidth, nscoord aHeight)
{
return NS_OK;
}
NS_IMETHODIMP
nsComboboxControlFrame::DeleteFrame(nsIPresContext& aPresContext)
{
// Cleanup frames in popup child list
mPopupFrames.DeleteFrames(aPresContext);
return nsAreaFrame::DeleteFrame(aPresContext);
}
NS_IMETHODIMP
nsComboboxControlFrame::FirstChild(nsIAtom* aListName,
nsIFrame** aFirstChild) const
{
if (nsLayoutAtoms::popupList == aListName) {
*aFirstChild = mPopupFrames.FirstChild();
} else {
nsAreaFrame::FirstChild(aListName, aFirstChild);
}
return NS_OK;
}
NS_IMETHODIMP
nsComboboxControlFrame::SetInitialChildList(nsIPresContext& aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
nsresult rv = NS_OK;
if (nsLayoutAtoms::popupList == aListName) {
mPopupFrames.SetFrames(aChildList);
} else {
rv = nsAreaFrame::SetInitialChildList(aPresContext, aListName, aChildList);
InitTextStr(PR_FALSE);
}
return rv;
}
NS_IMETHODIMP
nsComboboxControlFrame::GetAdditionalChildListName(PRInt32 aIndex,
nsIAtom** aListName) const
{
// Maintain a seperate child list for the dropdown list (i.e. popup listbox)
// This is necessary because we don't want the listbox to be included in the layout
// of the combox's children because it would take up space, when it is suppose to
// be floating above the display.
NS_PRECONDITION(nsnull != aListName, "null OUT parameter pointer");
if (aIndex <= NS_AREA_FRAME_ABSOLUTE_LIST_INDEX) {
return nsAreaFrame::GetAdditionalChildListName(aIndex, aListName);
}
*aListName = nsnull;
if (NS_COMBO_FRAME_POPUP_LIST_INDEX == aIndex) {
*aListName = nsLayoutAtoms::popupList;
NS_ADDREF(*aListName);
}
return NS_OK;
}
PRIntn
nsComboboxControlFrame::GetSkipSides() const
{
// Don't skip any sides during border rendering
return 0;
}
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