1 files changed, 311 insertions, 0 deletions
diff --git a/layout/xul/nsScrollbarFrame.cpp b/layout/xul/nsScrollbarFrame.cpp
new file mode 100644
index 0000000000..d9c28a2bf9
--- /dev/null
+++ b/layout/xul/nsScrollbarFrame.cpp
@@ -0,0 +1,311 @@
+/* -*- 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 "nsScrollbarFrame.h"
+#include "nsSliderFrame.h"
+#include "nsScrollbarButtonFrame.h"
+#include "nsGkAtoms.h"
+#include "nsIScrollableFrame.h"
+#include "nsIScrollbarMediator.h"
+#include "mozilla/LookAndFeel.h"
+#include "nsThemeConstants.h"
+#include "nsIContent.h"
+#include "nsIDOMMutationEvent.h"
+
+using namespace mozilla;
+
+//
+// NS_NewScrollbarFrame
+//
+// Creates a new scrollbar frame and returns it
+//
+nsIFrame*
+NS_NewScrollbarFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{
+  return new (aPresShell) nsScrollbarFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsScrollbarFrame)
+
+NS_QUERYFRAME_HEAD(nsScrollbarFrame)
+  NS_QUERYFRAME_ENTRY(nsScrollbarFrame)
+NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
+
+void
+nsScrollbarFrame::Init(nsIContent*       aContent,
+                       nsContainerFrame* aParent,
+                       nsIFrame*         aPrevInFlow)
+{
+  nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
+
+  // We want to be a reflow root since we use reflows to move the
+  // slider.  Any reflow inside the scrollbar frame will be a reflow to
+  // move the slider and will thus not change anything outside of the
+  // scrollbar or change the size of the scrollbar frame.
+  mState |= NS_FRAME_REFLOW_ROOT;
+}
+
+void
+nsScrollbarFrame::Reflow(nsPresContext*          aPresContext,
+                         ReflowOutput&     aDesiredSize,
+                         const ReflowInput& aReflowInput,
+                         nsReflowStatus&          aStatus)
+{
+  nsBoxFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
+
+  // nsGfxScrollFrame may have told us to shrink to nothing. If so, make sure our
+  // desired size agrees.
+  if (aReflowInput.AvailableWidth() == 0) {
+    aDesiredSize.Width() = 0;
+  }
+  if (aReflowInput.AvailableHeight() == 0) {
+    aDesiredSize.Height() = 0;
+  }
+}
+
+nsIAtom*
+nsScrollbarFrame::GetType() const
+{
+  return nsGkAtoms::scrollbarFrame;
+}
+
+nsresult
+nsScrollbarFrame::AttributeChanged(int32_t aNameSpaceID,
+                                   nsIAtom* aAttribute,
+                                   int32_t aModType)
+{
+  nsresult rv = nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute,
+                                             aModType);
+
+  // if the current position changes, notify any nsGfxScrollFrame
+  // parent we may have
+  if (aAttribute != nsGkAtoms::curpos)
+    return rv;
+
+  nsIScrollableFrame* scrollable = do_QueryFrame(GetParent());
+  if (!scrollable)
+    return rv;
+
+  nsCOMPtr<nsIContent> content(mContent);
+  scrollable->CurPosAttributeChanged(content);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsScrollbarFrame::HandlePress(nsPresContext* aPresContext,
+                              WidgetGUIEvent* aEvent,
+                              nsEventStatus* aEventStatus)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScrollbarFrame::HandleMultiplePress(nsPresContext* aPresContext,
+                                      WidgetGUIEvent* aEvent,
+                                      nsEventStatus* aEventStatus,
+                                      bool aControlHeld)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsScrollbarFrame::HandleDrag(nsPresContext* aPresContext,
+                             WidgetGUIEvent* aEvent,
+                             nsEventStatus* aEventStatus)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsScrollbarFrame::HandleRelease(nsPresContext* aPresContext,
+                                WidgetGUIEvent* aEvent,
+                                nsEventStatus* aEventStatus)
+{
+  return NS_OK;
+}
+
+void
+nsScrollbarFrame::SetScrollbarMediatorContent(nsIContent* aMediator)
+{
+  mScrollbarMediator = aMediator;
+}
+
+nsIScrollbarMediator*
+nsScrollbarFrame::GetScrollbarMediator()
+{
+  if (!mScrollbarMediator) {
+    return nullptr;
+  }
+  nsIFrame* f = mScrollbarMediator->GetPrimaryFrame();
+  nsIScrollableFrame* scrollFrame = do_QueryFrame(f);
+  nsIScrollbarMediator* sbm;
+
+  if (scrollFrame) {
+    nsIFrame* scrolledFrame = scrollFrame->GetScrolledFrame();
+    sbm = do_QueryFrame(scrolledFrame);
+    if (sbm) {
+      return sbm;
+    }
+  }
+  sbm = do_QueryFrame(f);
+  if (f && !sbm) {
+    f = f->PresContext()->PresShell()->GetRootScrollFrame();
+    if (f && f->GetContent() == mScrollbarMediator) {
+      return do_QueryFrame(f);
+    }
+  }
+  return sbm;
+}
+
+nsresult
+nsScrollbarFrame::GetXULMargin(nsMargin& aMargin)
+{
+  nsresult rv = NS_ERROR_FAILURE;
+  aMargin.SizeTo(0,0,0,0);
+
+  if (LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) != 0) {
+    nsPresContext* presContext = PresContext();
+    nsITheme* theme = presContext->GetTheme();
+    if (theme) {
+      LayoutDeviceIntSize size;
+      bool isOverridable;
+      theme->GetMinimumWidgetSize(presContext, this, NS_THEME_SCROLLBAR, &size,
+                                  &isOverridable);
+      if (IsXULHorizontal()) {
+        aMargin.top = -presContext->DevPixelsToAppUnits(size.height);
+      }
+      else {
+        aMargin.left = -presContext->DevPixelsToAppUnits(size.width);
+      }
+      rv = NS_OK;
+    }
+  }
+
+  if (NS_FAILED(rv)) {
+    rv = nsBox::GetXULMargin(aMargin);
+  }
+
+  if (NS_SUCCEEDED(rv) && !IsXULHorizontal()) {
+    nsIScrollbarMediator* scrollFrame = GetScrollbarMediator();
+    if (scrollFrame && !scrollFrame->IsScrollbarOnRight()) {
+      Swap(aMargin.left, aMargin.right);
+    }
+  }
+
+  return rv;
+}
+
+void
+nsScrollbarFrame::SetIncrementToLine(int32_t aDirection)
+{
+  // get the scrollbar's content node
+  nsIContent* content = GetContent();
+  mSmoothScroll = true;
+  mIncrement = aDirection * nsSliderFrame::GetIncrement(content);
+}
+
+void
+nsScrollbarFrame::SetIncrementToPage(int32_t aDirection)
+{
+  // get the scrollbar's content node
+  nsIContent* content = GetContent();
+  mSmoothScroll = true;
+  mIncrement = aDirection * nsSliderFrame::GetPageIncrement(content);
+}
+
+void
+nsScrollbarFrame::SetIncrementToWhole(int32_t aDirection)
+{
+  // get the scrollbar's content node
+  nsIContent* content = GetContent();
+  if (aDirection == -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.
+  mSmoothScroll = false;
+}
+
+int32_t
+nsScrollbarFrame::MoveToNewPosition()
+{
+  // get the scrollbar's content node
+  nsCOMPtr<nsIContent> content = GetContent();
+
+  // get the current pos
+  int32_t curpos = nsSliderFrame::GetCurrentPosition(content);
+
+  // get the max pos
+  int32_t maxpos = nsSliderFrame::GetMaxPosition(content);
+
+  // save the old curpos
+  int32_t oldCurpos = curpos;
+
+  // 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;
+  }
+
+  // set the current position of the slider.
+  nsAutoString curposStr;
+  curposStr.AppendInt(curpos);
+
+  nsWeakFrame weakFrame(this);
+  if (mSmoothScroll) {
+    content->SetAttr(kNameSpaceID_None, nsGkAtoms::smooth, NS_LITERAL_STRING("true"), false);
+  }
+  content->SetAttr(kNameSpaceID_None, nsGkAtoms::curpos, curposStr, false);
+  // notify the nsScrollbarFrame of the change
+  AttributeChanged(kNameSpaceID_None, nsGkAtoms::curpos, nsIDOMMutationEvent::MODIFICATION);
+  if (!weakFrame.IsAlive()) {
+    return curpos;
+  }
+  // notify all nsSliderFrames of the change
+  nsIFrame::ChildListIterator childLists(this);
+  for (; !childLists.IsDone(); childLists.Next()) {
+    nsFrameList::Enumerator childFrames(childLists.CurrentList());
+    for (; !childFrames.AtEnd(); childFrames.Next()) {
+      nsIFrame* f = childFrames.get();
+      nsSliderFrame* sliderFrame = do_QueryFrame(f);
+      if (sliderFrame) {
+        sliderFrame->AttributeChanged(kNameSpaceID_None, nsGkAtoms::curpos, nsIDOMMutationEvent::MODIFICATION);
+        if (!weakFrame.IsAlive()) {
+          return curpos;
+        }
+      }
+    }
+  }
+  // See if we have appearance information for a theme.
+  const nsStyleDisplay* disp = StyleDisplay();
+  nsPresContext* presContext = PresContext();
+  if (disp->mAppearance) {
+    nsITheme *theme = presContext->GetTheme();
+    if (theme && theme->ThemeSupportsWidget(presContext, this, disp->mAppearance)) {
+      bool repaint;
+      nsAttrValue oldValue;
+      oldValue.SetTo(oldCurpos);
+      theme->WidgetStateChanged(this, disp->mAppearance, nsGkAtoms::curpos,
+          &repaint, &oldValue);
+    }
+  }
+  content->UnsetAttr(kNameSpaceID_None, nsGkAtoms::smooth, false);
+  return curpos;
+}