зеркало из https://github.com/mozilla/gecko-dev.git
317 строки
9.0 KiB
C++
317 строки
9.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//
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// Eric Vaughan
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// Netscape Communications
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//
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// See documentation in associated header file
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//
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#include "nsScrollbarButtonFrame.h"
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#include "nsPresContext.h"
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#include "nsIContent.h"
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#include "nsCOMPtr.h"
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#include "nsINameSpaceManager.h"
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#include "nsGkAtoms.h"
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#include "nsSliderFrame.h"
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#include "nsScrollbarFrame.h"
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#include "nsIScrollbarMediator.h"
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#include "nsRepeatService.h"
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#include "mozilla/LookAndFeel.h"
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#include "mozilla/MouseEvents.h"
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using namespace mozilla;
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//
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// NS_NewToolbarFrame
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//
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// Creates a new Toolbar frame and returns it
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//
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nsIFrame*
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NS_NewScrollbarButtonFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsScrollbarButtonFrame(aPresShell, aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsScrollbarButtonFrame)
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NS_IMETHODIMP
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nsScrollbarButtonFrame::HandleEvent(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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NS_ENSURE_ARG_POINTER(aEventStatus);
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// If a web page calls event.preventDefault() we still want to
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// scroll when scroll arrow is clicked. See bug 511075.
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if (!mContent->IsInNativeAnonymousSubtree() &&
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nsEventStatus_eConsumeNoDefault == *aEventStatus) {
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return NS_OK;
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}
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switch (aEvent->message) {
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case NS_MOUSE_BUTTON_DOWN:
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mCursorOnThis = true;
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// if we didn't handle the press ourselves, pass it on to the superclass
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if (HandleButtonPress(aPresContext, aEvent, aEventStatus)) {
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return NS_OK;
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}
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break;
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case NS_MOUSE_BUTTON_UP:
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HandleRelease(aPresContext, aEvent, aEventStatus);
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break;
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case NS_MOUSE_EXIT_SYNTH:
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mCursorOnThis = false;
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break;
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case NS_MOUSE_MOVE: {
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nsPoint cursor =
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nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, this);
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nsRect frameRect(nsPoint(0, 0), GetSize());
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mCursorOnThis = frameRect.Contains(cursor);
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break;
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}
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}
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return nsButtonBoxFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
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}
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bool
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nsScrollbarButtonFrame::HandleButtonPress(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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// Get the desired action for the scrollbar button.
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LookAndFeel::IntID tmpAction;
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uint16_t button = aEvent->AsMouseEvent()->button;
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if (button == WidgetMouseEvent::eLeftButton) {
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tmpAction = LookAndFeel::eIntID_ScrollButtonLeftMouseButtonAction;
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} else if (button == WidgetMouseEvent::eMiddleButton) {
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tmpAction = LookAndFeel::eIntID_ScrollButtonMiddleMouseButtonAction;
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} else if (button == WidgetMouseEvent::eRightButton) {
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tmpAction = LookAndFeel::eIntID_ScrollButtonRightMouseButtonAction;
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} else {
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return false;
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}
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// Get the button action metric from the pres. shell.
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int32_t pressedButtonAction;
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if (NS_FAILED(LookAndFeel::GetInt(tmpAction, &pressedButtonAction))) {
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return false;
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}
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// get the scrollbar control
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nsIFrame* scrollbar;
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GetParentWithTag(nsGkAtoms::scrollbar, this, scrollbar);
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if (scrollbar == nullptr)
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return false;
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// get the scrollbars content node
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nsIContent* content = scrollbar->GetContent();
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static nsIContent::AttrValuesArray strings[] = { &nsGkAtoms::increment,
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&nsGkAtoms::decrement,
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nullptr };
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int32_t index = mContent->FindAttrValueIn(kNameSpaceID_None,
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nsGkAtoms::type,
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strings, eCaseMatters);
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int32_t direction;
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if (index == 0)
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direction = 1;
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else if (index == 1)
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direction = -1;
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else
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return false;
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// Whether or not to repeat the click action.
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bool repeat = true;
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// Use smooth scrolling by default.
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bool smoothScroll = true;
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switch (pressedButtonAction) {
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case 0:
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mIncrement = direction * nsSliderFrame::GetIncrement(content);
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break;
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case 1:
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mIncrement = direction * nsSliderFrame::GetPageIncrement(content);
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break;
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case 2:
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if (direction == -1)
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mIncrement = -nsSliderFrame::GetCurrentPosition(content);
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else
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mIncrement = nsSliderFrame::GetMaxPosition(content) -
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nsSliderFrame::GetCurrentPosition(content);
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// Don't repeat or use smooth scrolling if scrolling to beginning or end
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// of a page.
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repeat = smoothScroll = false;
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break;
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case 3:
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default:
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// We were told to ignore this click, or someone assigned a non-standard
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// value to the button's action.
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return false;
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}
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// set this attribute so we can style it later
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nsWeakFrame weakFrame(this);
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mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::active, NS_LITERAL_STRING("true"), true);
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nsIPresShell::SetCapturingContent(mContent, CAPTURE_IGNOREALLOWED);
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if (weakFrame.IsAlive()) {
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DoButtonAction(smoothScroll);
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}
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if (repeat)
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StartRepeat();
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return true;
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}
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NS_IMETHODIMP
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nsScrollbarButtonFrame::HandleRelease(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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nsIPresShell::SetCapturingContent(nullptr, 0);
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// we're not active anymore
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mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::active, true);
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StopRepeat();
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return NS_OK;
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}
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void nsScrollbarButtonFrame::Notify()
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{
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// Since this is only going to get called if we're scrolling a page length
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// or a line increment, we will always use smooth scrolling.
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if (mCursorOnThis ||
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LookAndFeel::GetInt(
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LookAndFeel::eIntID_ScrollbarButtonAutoRepeatBehavior, 0)) {
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DoButtonAction(true);
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}
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}
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void
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nsScrollbarButtonFrame::MouseClicked(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent)
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{
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nsButtonBoxFrame::MouseClicked(aPresContext, aEvent);
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//MouseClicked();
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}
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void
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nsScrollbarButtonFrame::DoButtonAction(bool aSmoothScroll)
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{
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// get the scrollbar control
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nsIFrame* scrollbar;
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GetParentWithTag(nsGkAtoms::scrollbar, this, scrollbar);
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if (scrollbar == nullptr)
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return;
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// get the scrollbars content node
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nsCOMPtr<nsIContent> content = scrollbar->GetContent();
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// get the current pos
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int32_t curpos = nsSliderFrame::GetCurrentPosition(content);
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int32_t oldpos = curpos;
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// get the max pos
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int32_t maxpos = nsSliderFrame::GetMaxPosition(content);
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// increment the given amount
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if (mIncrement)
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curpos += mIncrement;
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// make sure the current position is between the current and max positions
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if (curpos < 0)
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curpos = 0;
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else if (curpos > maxpos)
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curpos = maxpos;
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nsScrollbarFrame* sb = do_QueryFrame(scrollbar);
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if (sb) {
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nsIScrollbarMediator* m = sb->GetScrollbarMediator();
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if (m) {
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m->ScrollbarButtonPressed(sb, oldpos, curpos);
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return;
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}
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}
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// set the current position of the slider.
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nsAutoString curposStr;
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curposStr.AppendInt(curpos);
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if (aSmoothScroll)
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content->SetAttr(kNameSpaceID_None, nsGkAtoms::smooth, NS_LITERAL_STRING("true"), false);
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content->SetAttr(kNameSpaceID_None, nsGkAtoms::curpos, curposStr, true);
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if (aSmoothScroll)
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content->UnsetAttr(kNameSpaceID_None, nsGkAtoms::smooth, false);
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}
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nsresult
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nsScrollbarButtonFrame::GetChildWithTag(nsPresContext* aPresContext,
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nsIAtom* atom, nsIFrame* start,
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nsIFrame*& result)
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{
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// recursively search our children
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nsIFrame* childFrame = start->GetFirstPrincipalChild();
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while (nullptr != childFrame)
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{
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// get the content node
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nsIContent* child = childFrame->GetContent();
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if (child) {
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// see if it is the child
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if (child->Tag() == atom)
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{
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result = childFrame;
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return NS_OK;
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}
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}
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// recursive search the child
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GetChildWithTag(aPresContext, atom, childFrame, result);
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if (result != nullptr)
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return NS_OK;
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childFrame = childFrame->GetNextSibling();
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}
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result = nullptr;
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return NS_OK;
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}
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nsresult
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nsScrollbarButtonFrame::GetParentWithTag(nsIAtom* toFind, nsIFrame* start,
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nsIFrame*& result)
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{
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while (start)
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{
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start = start->GetParent();
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if (start) {
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// get the content node
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nsIContent* child = start->GetContent();
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if (child && child->Tag() == toFind) {
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result = start;
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return NS_OK;
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}
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}
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}
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result = nullptr;
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return NS_OK;
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}
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void
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nsScrollbarButtonFrame::DestroyFrom(nsIFrame* aDestructRoot)
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{
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// Ensure our repeat service isn't going... it's possible that a scrollbar can disappear out
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// from under you while you're in the process of scrolling.
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StopRepeat();
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nsButtonBoxFrame::DestroyFrom(aDestructRoot);
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}
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