The Tor Browser: layout/xul/nsScrollbarButtonFrame.cpp@7e26c7da4463 (annotated)

layout/xul/nsScrollbarButtonFrame.cpp@7e26c7da4463 (annotated)

layout/xul/nsScrollbarButtonFrame.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

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

The Tor Browser / annotate

layout/xul/nsScrollbarButtonFrame.cpp@7e26c7da4463 (annotated)

layout/xul/nsScrollbarButtonFrame.cpp