The Tor Browser: layout/xul/nsSliderFrame.cpp@ac0c01689b40

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 //

     7 // Eric Vaughan

     8 // Netscape Communications

     9 //

    10 // See documentation in associated header file

    11 //

    13 #include "nsSliderFrame.h"

    14 #include "nsStyleContext.h"

    15 #include "nsPresContext.h"

    16 #include "nsIContent.h"

    17 #include "nsCOMPtr.h"

    18 #include "nsNameSpaceManager.h"

    19 #include "nsGkAtoms.h"

    20 #include "nsHTMLParts.h"

    21 #include "nsIPresShell.h"

    22 #include "nsCSSRendering.h"

    23 #include "nsIDOMMouseEvent.h"

    24 #include "nsScrollbarButtonFrame.h"

    25 #include "nsISliderListener.h"

    26 #include "nsIScrollbarMediator.h"

    27 #include "nsScrollbarFrame.h"

    28 #include "nsRepeatService.h"

    29 #include "nsBoxLayoutState.h"

    30 #include "nsSprocketLayout.h"

    31 #include "nsIServiceManager.h"

    32 #include "nsContentUtils.h"

    33 #include "nsLayoutUtils.h"

    34 #include "nsDisplayList.h"

    35 #include "mozilla/Preferences.h"

    36 #include "mozilla/LookAndFeel.h"

    37 #include "mozilla/MouseEvents.h"

    38 #include <algorithm>

    40 using namespace mozilla;

    42 bool nsSliderFrame::gMiddlePref = false;

    43 int32_t nsSliderFrame::gSnapMultiplier;

    45 // Turn this on if you want to debug slider frames.

    46 #undef DEBUG_SLIDER

    48 static already_AddRefed<nsIContent>

    49 GetContentOfBox(nsIFrame *aBox)

    50 {

    51   nsCOMPtr<nsIContent> content = aBox->GetContent();

    52   return content.forget();

    53 }

    55 nsIFrame*

    56 NS_NewSliderFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)

    57 {

    58   return new (aPresShell) nsSliderFrame(aPresShell, aContext);

    59 }

    61 NS_IMPL_FRAMEARENA_HELPERS(nsSliderFrame)

    63 nsSliderFrame::nsSliderFrame(nsIPresShell* aPresShell, nsStyleContext* aContext):

    64   nsBoxFrame(aPresShell, aContext),

    65   mCurPos(0),

    66   mChange(0),

    67   mUserChanged(false)

    68 {

    69 }

    71 // stop timer

    72 nsSliderFrame::~nsSliderFrame()

    73 {

    74 }

    76 void

    77 nsSliderFrame::Init(nsIContent*      aContent,

    78                     nsIFrame*        aParent,

    79                     nsIFrame*        aPrevInFlow)

    80 {

    81   nsBoxFrame::Init(aContent, aParent, aPrevInFlow);

    83   static bool gotPrefs = false;

    84   if (!gotPrefs) {

    85     gotPrefs = true;

    87     gMiddlePref = Preferences::GetBool("middlemouse.scrollbarPosition");

    88     gSnapMultiplier = Preferences::GetInt("slider.snapMultiplier");

    89   }

    91   mCurPos = GetCurrentPosition(aContent);

    92 }

    94 nsresult

    95 nsSliderFrame::RemoveFrame(ChildListID     aListID,

    96                            nsIFrame*       aOldFrame)

    97 {

    98   nsresult rv = nsBoxFrame::RemoveFrame(aListID, aOldFrame);

    99   if (mFrames.IsEmpty())

   100     RemoveListener();

   102   return rv;

   103 }

   105 nsresult

   106 nsSliderFrame::InsertFrames(ChildListID     aListID,

   107                             nsIFrame*       aPrevFrame,

   108                             nsFrameList&    aFrameList)

   109 {

   110   bool wasEmpty = mFrames.IsEmpty();

   111   nsresult rv = nsBoxFrame::InsertFrames(aListID, aPrevFrame, aFrameList);

   112   if (wasEmpty)

   113     AddListener();

   115   return rv;

   116 }

   118 nsresult

   119 nsSliderFrame::AppendFrames(ChildListID     aListID,

   120                             nsFrameList&    aFrameList)

   121 {

   122   // if we have no children and on was added then make sure we add the

   123   // listener

   124   bool wasEmpty = mFrames.IsEmpty();

   125   nsresult rv = nsBoxFrame::AppendFrames(aListID, aFrameList);

   126   if (wasEmpty)

   127     AddListener();

   129   return rv;

   130 }

   132 int32_t

   133 nsSliderFrame::GetCurrentPosition(nsIContent* content)

   134 {

   135   return GetIntegerAttribute(content, nsGkAtoms::curpos, 0);

   136 }

   138 int32_t

   139 nsSliderFrame::GetMinPosition(nsIContent* content)

   140 {

   141   return GetIntegerAttribute(content, nsGkAtoms::minpos, 0);

   142 }

   144 int32_t

   145 nsSliderFrame::GetMaxPosition(nsIContent* content)

   146 {

   147   return GetIntegerAttribute(content, nsGkAtoms::maxpos, 100);

   148 }

   150 int32_t

   151 nsSliderFrame::GetIncrement(nsIContent* content)

   152 {

   153   return GetIntegerAttribute(content, nsGkAtoms::increment, 1);

   154 }

   157 int32_t

   158 nsSliderFrame::GetPageIncrement(nsIContent* content)

   159 {

   160   return GetIntegerAttribute(content, nsGkAtoms::pageincrement, 10);

   161 }

   163 int32_t

   164 nsSliderFrame::GetIntegerAttribute(nsIContent* content, nsIAtom* atom, int32_t defaultValue)

   165 {

   166     nsAutoString value;

   167     content->GetAttr(kNameSpaceID_None, atom, value);

   168     if (!value.IsEmpty()) {

   169       nsresult error;

   171       // convert it to an integer

   172       defaultValue = value.ToInteger(&error);

   173     }

   175     return defaultValue;

   176 }

   178 class nsValueChangedRunnable : public nsRunnable

   179 {

   180 public:

   181   nsValueChangedRunnable(nsISliderListener* aListener,

   182                          nsIAtom* aWhich,

   183                          int32_t aValue,

   184                          bool aUserChanged)

   185   : mListener(aListener), mWhich(aWhich),

   186     mValue(aValue), mUserChanged(aUserChanged)

   187   {}

   189   NS_IMETHODIMP Run()

   190   {

   191     return mListener->ValueChanged(nsDependentAtomString(mWhich),

   192                                    mValue, mUserChanged);

   193   }

   195   nsCOMPtr<nsISliderListener> mListener;

   196   nsCOMPtr<nsIAtom> mWhich;

   197   int32_t mValue;

   198   bool mUserChanged;

   199 };

   201 class nsDragStateChangedRunnable : public nsRunnable

   202 {

   203 public:

   204   nsDragStateChangedRunnable(nsISliderListener* aListener,

   205                              bool aDragBeginning)

   206   : mListener(aListener),

   207     mDragBeginning(aDragBeginning)

   208   {}

   210   NS_IMETHODIMP Run()

   211   {

   212     return mListener->DragStateChanged(mDragBeginning);

   213   }

   215   nsCOMPtr<nsISliderListener> mListener;

   216   bool mDragBeginning;

   217 };

   219 nsresult

   220 nsSliderFrame::AttributeChanged(int32_t aNameSpaceID,

   221                                 nsIAtom* aAttribute,

   222                                 int32_t aModType)

   223 {

   224   nsresult rv = nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute,

   225                                              aModType);

   226   // if the current position changes

   227   if (aAttribute == nsGkAtoms::curpos) {

   228      CurrentPositionChanged();

   229   } else if (aAttribute == nsGkAtoms::minpos ||

   230              aAttribute == nsGkAtoms::maxpos) {

   231       // bounds check it.

   233       nsIFrame* scrollbarBox = GetScrollbar();

   234       nsCOMPtr<nsIContent> scrollbar;

   235       scrollbar = GetContentOfBox(scrollbarBox);

   236       int32_t current = GetCurrentPosition(scrollbar);

   237       int32_t min = GetMinPosition(scrollbar);

   238       int32_t max = GetMaxPosition(scrollbar);

   240       // inform the parent <scale> that the minimum or maximum changed

   241       nsIFrame* parent = GetParent();

   242       if (parent) {

   243         nsCOMPtr<nsISliderListener> sliderListener = do_QueryInterface(parent->GetContent());

   244         if (sliderListener) {

   245           nsContentUtils::AddScriptRunner(

   246             new nsValueChangedRunnable(sliderListener, aAttribute,

   247                                        aAttribute == nsGkAtoms::minpos ? min : max, false));

   248         }

   249       }

   251       if (current < min || current > max)

   252       {

   253         if (current < min || max < min)

   254             current = min;

   255         else if (current > max)

   256             current = max;

   258         // set the new position and notify observers

   259         nsScrollbarFrame* scrollbarFrame = do_QueryFrame(scrollbarBox);

   260         if (scrollbarFrame) {

   261           nsIScrollbarMediator* mediator = scrollbarFrame->GetScrollbarMediator();

   262           if (mediator) {

   263             mediator->PositionChanged(scrollbarFrame, GetCurrentPosition(scrollbar), current);

   264           }

   265         }

   267         nsContentUtils::AddScriptRunner(

   268           new nsSetAttrRunnable(scrollbar, nsGkAtoms::curpos, current));

   269       }

   270   }

   272   if (aAttribute == nsGkAtoms::minpos ||

   273       aAttribute == nsGkAtoms::maxpos ||

   274       aAttribute == nsGkAtoms::pageincrement ||

   275       aAttribute == nsGkAtoms::increment) {

   277       PresContext()->PresShell()->

   278         FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);

   279   }

   281   return rv;

   282 }

   284 void

   285 nsSliderFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,

   286                                 const nsRect&           aDirtyRect,

   287                                 const nsDisplayListSet& aLists)

   288 {

   289   if (aBuilder->IsForEventDelivery() && isDraggingThumb()) {

   290     // This is EVIL, we shouldn't be messing with event delivery just to get

   291     // thumb mouse drag events to arrive at the slider!

   292     aLists.Outlines()->AppendNewToTop(new (aBuilder)

   293       nsDisplayEventReceiver(aBuilder, this));

   294     return;

   295   }

   297   nsBoxFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);

   298 }

   300 void

   301 nsSliderFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,

   302                                            const nsRect&           aDirtyRect,

   303                                            const nsDisplayListSet& aLists)

   304 {

   305   // if we are too small to have a thumb don't paint it.

   306   nsIFrame* thumb = GetChildBox();

   308   if (thumb) {

   309     nsRect thumbRect(thumb->GetRect());

   310     nsMargin m;

   311     thumb->GetMargin(m);

   312     thumbRect.Inflate(m);

   314     nsRect crect;

   315     GetClientRect(crect);

   317     if (crect.width < thumbRect.width || crect.height < thumbRect.height)

   318       return;

   319   }

   321   nsBoxFrame::BuildDisplayListForChildren(aBuilder, aDirtyRect, aLists);

   322 }

   324 NS_IMETHODIMP

   325 nsSliderFrame::DoLayout(nsBoxLayoutState& aState)

   326 {

   327   // get the thumb should be our only child

   328   nsIFrame* thumbBox = GetChildBox();

   330   if (!thumbBox) {

   331     SyncLayout(aState);

   332     return NS_OK;

   333   }

   335   EnsureOrient();

   337 #ifdef DEBUG_LAYOUT

   338   if (mState & NS_STATE_DEBUG_WAS_SET) {

   339       if (mState & NS_STATE_SET_TO_DEBUG)

   340           SetDebug(aState, true);

   341       else

   342           SetDebug(aState, false);

   343   }

   344 #endif

   346   // get the content area inside our borders

   347   nsRect clientRect;

   348   GetClientRect(clientRect);

   350   // get the scrollbar

   351   nsIFrame* scrollbarBox = GetScrollbar();

   352   nsCOMPtr<nsIContent> scrollbar;

   353   scrollbar = GetContentOfBox(scrollbarBox);

   355   // get the thumb's pref size

   356   nsSize thumbSize = thumbBox->GetPrefSize(aState);

   358   if (IsHorizontal())

   359     thumbSize.height = clientRect.height;

   360   else

   361     thumbSize.width = clientRect.width;

   363   int32_t curPos = GetCurrentPosition(scrollbar);

   364   int32_t minPos = GetMinPosition(scrollbar);

   365   int32_t maxPos = GetMaxPosition(scrollbar);

   366   int32_t pageIncrement = GetPageIncrement(scrollbar);

   368   maxPos = std::max(minPos, maxPos);

   369   curPos = clamped(curPos, minPos, maxPos);

   371   nscoord& availableLength = IsHorizontal() ? clientRect.width : clientRect.height;

   372   nscoord& thumbLength = IsHorizontal() ? thumbSize.width : thumbSize.height;

   374   if ((pageIncrement + maxPos - minPos) > 0 && thumbBox->GetFlex(aState) > 0) {

   375     float ratio = float(pageIncrement) / float(maxPos - minPos + pageIncrement);

   376     thumbLength = std::max(thumbLength, NSToCoordRound(availableLength * ratio));

   377   }

   379   // Round the thumb's length to device pixels.

   380   nsPresContext* presContext = PresContext();

   381   thumbLength = presContext->DevPixelsToAppUnits(

   382                   presContext->AppUnitsToDevPixels(thumbLength));

   384   // mRatio translates the thumb position in app units to the value.

   385   mRatio = (minPos != maxPos) ? float(availableLength - thumbLength) / float(maxPos - minPos) : 1;

   387   // in reverse mode, curpos is reversed such that lower values are to the

   388   // right or bottom and increase leftwards or upwards. In this case, use the

   389   // offset from the end instead of the beginning.

   390   bool reverse = mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::dir,

   391                                          nsGkAtoms::reverse, eCaseMatters);

   392   nscoord pos = reverse ? (maxPos - curPos) : (curPos - minPos);

   394   // set the thumb's coord to be the current pos * the ratio.

   395   nsRect thumbRect(clientRect.x, clientRect.y, thumbSize.width, thumbSize.height);

   396   int32_t& thumbPos = (IsHorizontal() ? thumbRect.x : thumbRect.y);

   397   thumbPos += NSToCoordRound(pos * mRatio);

   399   nsRect oldThumbRect(thumbBox->GetRect());

   400   LayoutChildAt(aState, thumbBox, thumbRect);

   402   SyncLayout(aState);

   404   // Redraw only if thumb changed size.

   405   if (!oldThumbRect.IsEqualInterior(thumbRect))

   406     Redraw(aState);

   408   return NS_OK;

   409 }

   412 nsresult

   413 nsSliderFrame::HandleEvent(nsPresContext* aPresContext,

   414                            WidgetGUIEvent* aEvent,

   415                            nsEventStatus* aEventStatus)

   416 {

   417   NS_ENSURE_ARG_POINTER(aEventStatus);

   419   // If a web page calls event.preventDefault() we still want to

   420   // scroll when scroll arrow is clicked. See bug 511075.

   421   if (!mContent->IsInNativeAnonymousSubtree() &&

   422       nsEventStatus_eConsumeNoDefault == *aEventStatus) {

   423     return NS_OK;

   424   }

   426   nsIFrame* scrollbarBox = GetScrollbar();

   427   nsCOMPtr<nsIContent> scrollbar;

   428   scrollbar = GetContentOfBox(scrollbarBox);

   429   bool isHorizontal = IsHorizontal();

   431   if (isDraggingThumb())

   432   {

   433     switch (aEvent->message) {

   434     case NS_TOUCH_MOVE:

   435     case NS_MOUSE_MOVE: {

   436       nsPoint eventPoint;

   437       if (!GetEventPoint(aEvent, eventPoint)) {

   438         break;

   439       }

   440       if (mChange) {

   441         // We're in the process of moving the thumb to the mouse,

   442         // but the mouse just moved.  Make sure to update our

   443         // destination point.

   444         mDestinationPoint = eventPoint;

   445         StopRepeat();

   446         StartRepeat();

   447         break;

   448       }

   450       nscoord pos = isHorizontal ? eventPoint.x : eventPoint.y;

   452       nsIFrame* thumbFrame = mFrames.FirstChild();

   453       if (!thumbFrame) {

   454         return NS_OK;

   455       }

   457       // take our current position and subtract the start location

   458       pos -= mDragStart;

   459       bool isMouseOutsideThumb = false;

   460       if (gSnapMultiplier) {

   461         nsSize thumbSize = thumbFrame->GetSize();

   462         if (isHorizontal) {

   463           // horizontal scrollbar - check if mouse is above or below thumb

   464           // XXXbz what about looking at the .y of the thumb's rect?  Is that

   465           // always zero here?

   466           if (eventPoint.y < -gSnapMultiplier * thumbSize.height ||

   467               eventPoint.y > thumbSize.height +

   468                                gSnapMultiplier * thumbSize.height)

   469             isMouseOutsideThumb = true;

   470         }

   471         else {

   472           // vertical scrollbar - check if mouse is left or right of thumb

   473           if (eventPoint.x < -gSnapMultiplier * thumbSize.width ||

   474               eventPoint.x > thumbSize.width +

   475                                gSnapMultiplier * thumbSize.width)

   476             isMouseOutsideThumb = true;

   477         }

   478       }

   479       if (aEvent->eventStructType == NS_TOUCH_EVENT) {

   480         *aEventStatus = nsEventStatus_eConsumeNoDefault;

   481       }

   482       if (isMouseOutsideThumb)

   483       {

   484         SetCurrentThumbPosition(scrollbar, mThumbStart, false, false);

   485         return NS_OK;

   486       }

   488       // set it

   489       SetCurrentThumbPosition(scrollbar, pos, false, true); // with snapping

   490     }

   491     break;

   493     case NS_TOUCH_END:

   494     case NS_MOUSE_BUTTON_UP:

   495       if (ShouldScrollForEvent(aEvent)) {

   496         // stop capturing

   497         AddListener();

   498         DragThumb(false);

   499         if (mChange) {

   500           StopRepeat();

   501           mChange = 0;

   502         }

   503         //we MUST call nsFrame HandleEvent for mouse ups to maintain the selection state and capture state.

   504         return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);

   505       }

   506     }

   508     //return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);

   509     return NS_OK;

   510   } else if (ShouldScrollToClickForEvent(aEvent)) {

   511     nsPoint eventPoint;

   512     if (!GetEventPoint(aEvent, eventPoint)) {

   513       return NS_OK;

   514     }

   515     nscoord pos = isHorizontal ? eventPoint.x : eventPoint.y;

   517     // adjust so that the middle of the thumb is placed under the click

   518     nsIFrame* thumbFrame = mFrames.FirstChild();

   519     if (!thumbFrame) {

   520       return NS_OK;

   521     }

   522     nsSize thumbSize = thumbFrame->GetSize();

   523     nscoord thumbLength = isHorizontal ? thumbSize.width : thumbSize.height;

   525     // set it

   526     nsWeakFrame weakFrame(this);

   527     // should aMaySnap be true here?

   528     SetCurrentThumbPosition(scrollbar, pos - thumbLength/2, false, false);

   529     NS_ENSURE_TRUE(weakFrame.IsAlive(), NS_OK);

   531     DragThumb(true);

   532     if (aEvent->eventStructType == NS_TOUCH_EVENT) {

   533       *aEventStatus = nsEventStatus_eConsumeNoDefault;

   534     }

   536     if (isHorizontal)

   537       mThumbStart = thumbFrame->GetPosition().x;

   538     else

   539       mThumbStart = thumbFrame->GetPosition().y;

   541     mDragStart = pos - mThumbStart;

   542   }

   544   // XXX hack until handle release is actually called in nsframe.

   545 //  if (aEvent->message == NS_MOUSE_EXIT_SYNTH || aEvent->message == NS_MOUSE_RIGHT_BUTTON_UP || aEvent->message == NS_MOUSE_LEFT_BUTTON_UP)

   546   //   HandleRelease(aPresContext, aEvent, aEventStatus);

   548   if (aEvent->message == NS_MOUSE_EXIT_SYNTH && mChange)

   549      HandleRelease(aPresContext, aEvent, aEventStatus);

   551   return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);

   552 }

   554 // Helper function to collect the "scroll to click" metric. Beware of

   555 // caching this, users expect to be able to change the system preference

   556 // and see the browser change its behavior immediately.

   557 bool

   558 nsSliderFrame::GetScrollToClick()

   559 {

   560   if (GetScrollbar() != this) {

   561     return LookAndFeel::GetInt(LookAndFeel::eIntID_ScrollToClick, false);

   562   }

   564   if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::movetoclick,

   565                             nsGkAtoms::_true, eCaseMatters)) {

   566     return true;

   567   }

   568   if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::movetoclick,

   569                             nsGkAtoms::_false, eCaseMatters)) {

   570     return false;

   571   }

   573 #ifdef XP_MACOSX

   574   return true;

   575 #else

   576   return false;

   577 #endif

   578 }

   580 nsIFrame*

   581 nsSliderFrame::GetScrollbar()

   582 {

   583   // if we are in a scrollbar then return the scrollbar's content node

   584   // if we are not then return ours.

   585    nsIFrame* scrollbar;

   586    nsScrollbarButtonFrame::GetParentWithTag(nsGkAtoms::scrollbar, this, scrollbar);

   588    if (scrollbar == nullptr)

   589        return this;

   591    return scrollbar->IsBoxFrame() ? scrollbar : this;

   592 }

   594 void

   595 nsSliderFrame::PageUpDown(nscoord change)

   596 {

   597   // on a page up or down get our page increment. We get this by getting the scrollbar we are in and

   598   // asking it for the current position and the page increment. If we are not in a scrollbar we will

   599   // get the values from our own node.

   600   nsIFrame* scrollbarBox = GetScrollbar();

   601   nsCOMPtr<nsIContent> scrollbar;

   602   scrollbar = GetContentOfBox(scrollbarBox);

   604   if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::dir,

   605                             nsGkAtoms::reverse, eCaseMatters))

   606     change = -change;

   608   nscoord pageIncrement = GetPageIncrement(scrollbar);

   609   int32_t curpos = GetCurrentPosition(scrollbar);

   610   int32_t minpos = GetMinPosition(scrollbar);

   611   int32_t maxpos = GetMaxPosition(scrollbar);

   613   // get the new position and make sure it is in bounds

   614   int32_t newpos = curpos + change * pageIncrement;

   615   if (newpos < minpos || maxpos < minpos)

   616     newpos = minpos;

   617   else if (newpos > maxpos)

   618     newpos = maxpos;

   620   SetCurrentPositionInternal(scrollbar, newpos, true);

   621 }

   623 // called when the current position changed and we need to update the thumb's location

   624 void

   625 nsSliderFrame::CurrentPositionChanged()

   626 {

   627   nsIFrame* scrollbarBox = GetScrollbar();

   628   nsCOMPtr<nsIContent> scrollbar;

   629   scrollbar = GetContentOfBox(scrollbarBox);

   631   // get the current position

   632   int32_t curPos = GetCurrentPosition(scrollbar);

   634   // do nothing if the position did not change

   635   if (mCurPos == curPos)

   636     return;

   638   // get our current min and max position from our content node

   639   int32_t minPos = GetMinPosition(scrollbar);

   640   int32_t maxPos = GetMaxPosition(scrollbar);

   642   maxPos = std::max(minPos, maxPos);

   643   curPos = clamped(curPos, minPos, maxPos);

   645   // get the thumb's rect

   646   nsIFrame* thumbFrame = mFrames.FirstChild();

   647   if (!thumbFrame)

   648     return; // The thumb may stream in asynchronously via XBL.

   650   nsRect thumbRect = thumbFrame->GetRect();

   652   nsRect clientRect;

   653   GetClientRect(clientRect);

   655   // figure out the new rect

   656   nsRect newThumbRect(thumbRect);

   658   bool reverse = mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::dir,

   659                                          nsGkAtoms::reverse, eCaseMatters);

   660   nscoord pos = reverse ? (maxPos - curPos) : (curPos - minPos);

   662   if (IsHorizontal())

   663      newThumbRect.x = clientRect.x + NSToCoordRound(pos * mRatio);

   664   else

   665      newThumbRect.y = clientRect.y + NSToCoordRound(pos * mRatio);

   667 #ifdef MOZ_WIDGET_GONK

   668   // avoid putting the scroll thumb at subpixel positions which cause needless invalidations

   669   nscoord appUnitsPerPixel = PresContext()->AppUnitsPerDevPixel();

   670   newThumbRect = newThumbRect.ToNearestPixels(appUnitsPerPixel).ToAppUnits(appUnitsPerPixel);

   671 #endif

   672   // set the rect

   673   thumbFrame->SetRect(newThumbRect);

   675   // Request a repaint of the scrollbar

   676   SchedulePaint();

   678   mCurPos = curPos;

   680   // inform the parent <scale> if it exists that the value changed

   681   nsIFrame* parent = GetParent();

   682   if (parent) {

   683     nsCOMPtr<nsISliderListener> sliderListener = do_QueryInterface(parent->GetContent());

   684     if (sliderListener) {

   685       nsContentUtils::AddScriptRunner(

   686         new nsValueChangedRunnable(sliderListener, nsGkAtoms::curpos, mCurPos, mUserChanged));

   687     }

   688   }

   689 }

   691 static void UpdateAttribute(nsIContent* aScrollbar, nscoord aNewPos, bool aNotify, bool aIsSmooth) {

   692   nsAutoString str;

   693   str.AppendInt(aNewPos);

   695   if (aIsSmooth) {

   696     aScrollbar->SetAttr(kNameSpaceID_None, nsGkAtoms::smooth, NS_LITERAL_STRING("true"), false);

   697   }

   698   aScrollbar->SetAttr(kNameSpaceID_None, nsGkAtoms::curpos, str, aNotify);

   699   if (aIsSmooth) {

   700     aScrollbar->UnsetAttr(kNameSpaceID_None, nsGkAtoms::smooth, false);

   701   }

   702 }

   704 // Use this function when you want to set the scroll position via the position

   705 // of the scrollbar thumb, e.g. when dragging the slider. This function scrolls

   706 // the content in such a way that thumbRect.x/.y becomes aNewThumbPos.

   707 void

   708 nsSliderFrame::SetCurrentThumbPosition(nsIContent* aScrollbar, nscoord aNewThumbPos,

   709                                        bool aIsSmooth, bool aMaySnap)

   710 {

   711   nsRect crect;

   712   GetClientRect(crect);

   713   nscoord offset = IsHorizontal() ? crect.x : crect.y;

   714   int32_t newPos = NSToIntRound((aNewThumbPos - offset) / mRatio);

   716   if (aMaySnap && mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::snap,

   717                                         nsGkAtoms::_true, eCaseMatters)) {

   718     // If snap="true", then the slider may only be set to min + (increment * x).

   719     // Otherwise, the slider may be set to any positive integer.

   720     int32_t increment = GetIncrement(aScrollbar);

   721     newPos = NSToIntRound(newPos / float(increment)) * increment;

   722   }

   724   SetCurrentPosition(aScrollbar, newPos, aIsSmooth);

   725 }

   727 // Use this function when you know the target scroll position of the scrolled content.

   728 // aNewPos should be passed to this function as a position as if the minpos is 0.

   729 // That is, the minpos will be added to the position by this function. In a reverse

   730 // direction slider, the newpos should be the distance from the end.

   731 void

   732 nsSliderFrame::SetCurrentPosition(nsIContent* aScrollbar, int32_t aNewPos,

   733                                   bool aIsSmooth)

   734 {

   735    // get min and max position from our content node

   736   int32_t minpos = GetMinPosition(aScrollbar);

   737   int32_t maxpos = GetMaxPosition(aScrollbar);

   739   // in reverse direction sliders, flip the value so that it goes from

   740   // right to left, or bottom to top.

   741   if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::dir,

   742                             nsGkAtoms::reverse, eCaseMatters))

   743     aNewPos = maxpos - aNewPos;

   744   else

   745     aNewPos += minpos;

   747   // get the new position and make sure it is in bounds

   748   if (aNewPos < minpos || maxpos < minpos)

   749     aNewPos = minpos;

   750   else if (aNewPos > maxpos)

   751     aNewPos = maxpos;

   753   SetCurrentPositionInternal(aScrollbar, aNewPos, aIsSmooth);

   754 }

   756 void

   757 nsSliderFrame::SetCurrentPositionInternal(nsIContent* aScrollbar, int32_t aNewPos,

   758                                           bool aIsSmooth)

   759 {

   760   nsCOMPtr<nsIContent> scrollbar = aScrollbar;

   761   nsIFrame* scrollbarBox = GetScrollbar();

   763   mUserChanged = true;

   765   nsScrollbarFrame* scrollbarFrame = do_QueryFrame(scrollbarBox);

   766   if (scrollbarFrame) {

   767     // See if we have a mediator.

   768     nsIScrollbarMediator* mediator = scrollbarFrame->GetScrollbarMediator();

   769     if (mediator) {

   770       nsRefPtr<nsPresContext> context = PresContext();

   771       nsCOMPtr<nsIContent> content = GetContent();

   772       mediator->PositionChanged(scrollbarFrame, GetCurrentPosition(scrollbar), aNewPos);

   773       // 'mediator' might be dangling now...

   774       UpdateAttribute(scrollbar, aNewPos, false, aIsSmooth);

   775       nsIFrame* frame = content->GetPrimaryFrame();

   776       if (frame && frame->GetType() == nsGkAtoms::sliderFrame) {

   777         static_cast<nsSliderFrame*>(frame)->CurrentPositionChanged();

   778       }

   779       mUserChanged = false;

   780       return;

   781     }

   782   }

   784   UpdateAttribute(scrollbar, aNewPos, true, aIsSmooth);

   785   mUserChanged = false;

   787 #ifdef DEBUG_SLIDER

   788   printf("Current Pos=%d\n",aNewPos);

   789 #endif

   791 }

   793 nsIAtom*

   794 nsSliderFrame::GetType() const

   795 {

   796   return nsGkAtoms::sliderFrame;

   797 }

   799 nsresult

   800 nsSliderFrame::SetInitialChildList(ChildListID     aListID,

   801                                    nsFrameList&    aChildList)

   802 {

   803   nsresult r = nsBoxFrame::SetInitialChildList(aListID, aChildList);

   805   AddListener();

   807   return r;

   808 }

   810 nsresult

   811 nsSliderMediator::HandleEvent(nsIDOMEvent* aEvent)

   812 {

   813   // Only process the event if the thumb is not being dragged.

   814   if (mSlider && !mSlider->isDraggingThumb())

   815     return mSlider->StartDrag(aEvent);

   817   return NS_OK;

   818 }

   820 nsresult

   821 nsSliderFrame::StartDrag(nsIDOMEvent* aEvent)

   822 {

   823 #ifdef DEBUG_SLIDER

   824   printf("Begin dragging\n");

   825 #endif

   826   if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,

   827                             nsGkAtoms::_true, eCaseMatters))

   828     return NS_OK;

   830   WidgetGUIEvent* event = aEvent->GetInternalNSEvent()->AsGUIEvent();

   832   if (!ShouldScrollForEvent(event)) {

   833     return NS_OK;

   834   }

   836   nsPoint pt;

   837   if (!GetEventPoint(event, pt)) {

   838     return NS_OK;

   839   }

   840   bool isHorizontal = IsHorizontal();

   841   nscoord pos = isHorizontal ? pt.x : pt.y;

   843   // If we should scroll-to-click, first place the middle of the slider thumb

   844   // under the mouse.

   845   nsCOMPtr<nsIContent> scrollbar;

   846   nscoord newpos = pos;

   847   bool scrollToClick = ShouldScrollToClickForEvent(event);

   848   if (scrollToClick) {

   849     // adjust so that the middle of the thumb is placed under the click

   850     nsIFrame* thumbFrame = mFrames.FirstChild();

   851     if (!thumbFrame) {

   852       return NS_OK;

   853     }

   854     nsSize thumbSize = thumbFrame->GetSize();

   855     nscoord thumbLength = isHorizontal ? thumbSize.width : thumbSize.height;

   857     newpos -= (thumbLength/2);

   859     nsIFrame* scrollbarBox = GetScrollbar();

   860     scrollbar = GetContentOfBox(scrollbarBox);

   861   }

   863   DragThumb(true);

   865   if (scrollToClick) {

   866     // should aMaySnap be true here?

   867     SetCurrentThumbPosition(scrollbar, newpos, false, false);

   868   }

   870   nsIFrame* thumbFrame = mFrames.FirstChild();

   871   if (!thumbFrame) {

   872     return NS_OK;

   873   }

   875   if (isHorizontal)

   876     mThumbStart = thumbFrame->GetPosition().x;

   877   else

   878     mThumbStart = thumbFrame->GetPosition().y;

   880   mDragStart = pos - mThumbStart;

   882 #ifdef DEBUG_SLIDER

   883   printf("Pressed mDragStart=%d\n",mDragStart);

   884 #endif

   886   return NS_OK;

   887 }

   889 void

   890 nsSliderFrame::DragThumb(bool aGrabMouseEvents)

   891 {

   892   // inform the parent <scale> that a drag is beginning or ending

   893   nsIFrame* parent = GetParent();

   894   if (parent) {

   895     nsCOMPtr<nsISliderListener> sliderListener = do_QueryInterface(parent->GetContent());

   896     if (sliderListener) {

   897       nsContentUtils::AddScriptRunner(

   898         new nsDragStateChangedRunnable(sliderListener, aGrabMouseEvents));

   899     }

   900   }

   902   nsIPresShell::SetCapturingContent(aGrabMouseEvents ? GetContent() : nullptr,

   903                                     aGrabMouseEvents ? CAPTURE_IGNOREALLOWED : 0);

   904 }

   906 bool

   907 nsSliderFrame::isDraggingThumb()

   908 {

   909   return (nsIPresShell::GetCapturingContent() == GetContent());

   910 }

   912 void

   913 nsSliderFrame::AddListener()

   914 {

   915   if (!mMediator) {

   916     mMediator = new nsSliderMediator(this);

   917   }

   919   nsIFrame* thumbFrame = mFrames.FirstChild();

   920   if (!thumbFrame) {

   921     return;

   922   }

   923   thumbFrame->GetContent()->

   924     AddSystemEventListener(NS_LITERAL_STRING("mousedown"), mMediator,

   925                            false, false);

   926   thumbFrame->GetContent()->

   927     AddSystemEventListener(NS_LITERAL_STRING("touchstart"), mMediator,

   928                            false, false);

   929 }

   931 void

   932 nsSliderFrame::RemoveListener()

   933 {

   934   NS_ASSERTION(mMediator, "No listener was ever added!!");

   936   nsIFrame* thumbFrame = mFrames.FirstChild();

   937   if (!thumbFrame)

   938     return;

   940   thumbFrame->GetContent()->

   941     RemoveSystemEventListener(NS_LITERAL_STRING("mousedown"), mMediator, false);

   942 }

   944 bool

   945 nsSliderFrame::ShouldScrollForEvent(WidgetGUIEvent* aEvent)

   946 {

   947   switch (aEvent->message) {

   948     case NS_TOUCH_START:

   949     case NS_TOUCH_END:

   950       return true;

   951     case NS_MOUSE_BUTTON_DOWN:

   952     case NS_MOUSE_BUTTON_UP: {

   953       uint16_t button = aEvent->AsMouseEvent()->button;

   954       return (button == WidgetMouseEvent::eLeftButton) ||

   955              (button == WidgetMouseEvent::eMiddleButton && gMiddlePref);

   956     }

   957     default:

   958       return false;

   959   }

   960 }

   962 bool

   963 nsSliderFrame::ShouldScrollToClickForEvent(WidgetGUIEvent* aEvent)

   964 {

   965   if (!ShouldScrollForEvent(aEvent)) {

   966     return false;

   967   }

   969   if (aEvent->message == NS_TOUCH_START) {

   970     return GetScrollToClick();

   971   }

   973   if (aEvent->message != NS_MOUSE_BUTTON_DOWN) {

   974     return false;

   975   }

   977 #ifdef XP_MACOSX

   978   // On Mac, clicking the scrollbar thumb should never scroll to click.

   979   if (IsEventOverThumb(aEvent)) {

   980     return false;

   981   }

   982 #endif

   984   WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();

   985   if (mouseEvent->button == WidgetMouseEvent::eLeftButton) {

   986 #ifdef XP_MACOSX

   987     bool invertPref = mouseEvent->IsAlt();

   988 #else

   989     bool invertPref = mouseEvent->IsShift();

   990 #endif

   991     return GetScrollToClick() != invertPref;

   992   }

   994   return true;

   995 }

   997 bool

   998 nsSliderFrame::IsEventOverThumb(WidgetGUIEvent* aEvent)

   999 {

  1000   nsIFrame* thumbFrame = mFrames.FirstChild();

  1001   if (!thumbFrame) {

  1002     return false;

  1003   }

  1005   nsPoint eventPoint;

  1006   if (!GetEventPoint(aEvent, eventPoint)) {

  1007     return false;

  1008   }

  1010   bool isHorizontal = IsHorizontal();

  1011   nsRect thumbRect = thumbFrame->GetRect();

  1012   nscoord eventPos = isHorizontal ? eventPoint.x : eventPoint.y;

  1013   nscoord thumbStart = isHorizontal ? thumbRect.x : thumbRect.y;

  1014   nscoord thumbEnd = isHorizontal ? thumbRect.XMost() : thumbRect.YMost();

  1016   return eventPos >= thumbStart && eventPos < thumbEnd;

  1017 }

  1019 NS_IMETHODIMP

  1020 nsSliderFrame::HandlePress(nsPresContext* aPresContext,

  1021                            WidgetGUIEvent* aEvent,

  1022                            nsEventStatus* aEventStatus)

  1023 {

  1024   if (!ShouldScrollForEvent(aEvent) || ShouldScrollToClickForEvent(aEvent)) {

  1025     return NS_OK;

  1026   }

  1028   if (IsEventOverThumb(aEvent)) {

  1029     return NS_OK;

  1030   }

  1032   nsIFrame* thumbFrame = mFrames.FirstChild();

  1033   if (!thumbFrame) // display:none?

  1034     return NS_OK;

  1036   if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,

  1037                             nsGkAtoms::_true, eCaseMatters))

  1038     return NS_OK;

  1040   nsRect thumbRect = thumbFrame->GetRect();

  1042   nscoord change = 1;

  1043   nsPoint eventPoint;

  1044   if (!GetEventPoint(aEvent, eventPoint)) {

  1045     return NS_OK;

  1046   }

  1047   if (IsHorizontal() ? eventPoint.x < thumbRect.x

  1048                      : eventPoint.y < thumbRect.y)

  1049     change = -1;

  1051   mChange = change;

  1052   DragThumb(true);

  1053   mDestinationPoint = eventPoint;

  1054   StartRepeat();

  1055   PageUpDown(change);

  1056   return NS_OK;

  1057 }

  1059 NS_IMETHODIMP

  1060 nsSliderFrame::HandleRelease(nsPresContext* aPresContext,

  1061                              WidgetGUIEvent* aEvent,

  1062                              nsEventStatus* aEventStatus)

  1063 {

  1064   StopRepeat();

  1066   return NS_OK;

  1067 }

  1069 void

  1070 nsSliderFrame::DestroyFrom(nsIFrame* aDestructRoot)

  1071 {

  1072   // tell our mediator if we have one we are gone.

  1073   if (mMediator) {

  1074     mMediator->SetSlider(nullptr);

  1075     mMediator = nullptr;

  1076   }

  1077   StopRepeat();

  1079   // call base class Destroy()

  1080   nsBoxFrame::DestroyFrom(aDestructRoot);

  1081 }

  1083 nsSize

  1084 nsSliderFrame::GetPrefSize(nsBoxLayoutState& aState)

  1085 {

  1086   EnsureOrient();

  1087   return nsBoxFrame::GetPrefSize(aState);

  1088 }

  1090 nsSize

  1091 nsSliderFrame::GetMinSize(nsBoxLayoutState& aState)

  1092 {

  1093   EnsureOrient();

  1095   // our min size is just our borders and padding

  1096   return nsBox::GetMinSize(aState);

  1097 }

  1099 nsSize

  1100 nsSliderFrame::GetMaxSize(nsBoxLayoutState& aState)

  1101 {

  1102   EnsureOrient();

  1103   return nsBoxFrame::GetMaxSize(aState);

  1104 }

  1106 void

  1107 nsSliderFrame::EnsureOrient()

  1108 {

  1109   nsIFrame* scrollbarBox = GetScrollbar();

  1111   bool isHorizontal = (scrollbarBox->GetStateBits() & NS_STATE_IS_HORIZONTAL) != 0;

  1112   if (isHorizontal)

  1113       mState |= NS_STATE_IS_HORIZONTAL;

  1114   else

  1115       mState &= ~NS_STATE_IS_HORIZONTAL;

  1116 }

  1119 void nsSliderFrame::Notify(void)

  1120 {

  1121     bool stop = false;

  1123     nsIFrame* thumbFrame = mFrames.FirstChild();

  1124     if (!thumbFrame) {

  1125       StopRepeat();

  1126       return;

  1127     }

  1128     nsRect thumbRect = thumbFrame->GetRect();

  1130     bool isHorizontal = IsHorizontal();

  1132     // See if the thumb has moved past our destination point.

  1133     // if it has we want to stop.

  1134     if (isHorizontal) {

  1135         if (mChange < 0) {

  1136             if (thumbRect.x < mDestinationPoint.x)

  1137                 stop = true;

  1138         } else {

  1139             if (thumbRect.x + thumbRect.width > mDestinationPoint.x)

  1140                 stop = true;

  1141         }

  1142     } else {

  1143          if (mChange < 0) {

  1144             if (thumbRect.y < mDestinationPoint.y)

  1145                 stop = true;

  1146         } else {

  1147             if (thumbRect.y + thumbRect.height > mDestinationPoint.y)

  1148                 stop = true;

  1149         }

  1150     }

  1153     if (stop) {

  1154       StopRepeat();

  1155     } else {

  1156       PageUpDown(mChange);

  1157     }

  1158 }

  1160 NS_IMPL_ISUPPORTS(nsSliderMediator,

  1161                   nsIDOMEventListener)

The Tor Browser / file revision

layout/xul/nsSliderFrame.cpp@ac0c01689b40

layout/xul/nsSliderFrame.cpp