michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: //
michael@0: // Eric Vaughan
michael@0: // Netscape Communications
michael@0: //
michael@0: // See documentation in associated header file
michael@0: //
michael@0: 
michael@0: #include "nsScrollbarFrame.h"
michael@0: #include "nsScrollbarButtonFrame.h"
michael@0: #include "nsGkAtoms.h"
michael@0: #include "nsIScrollableFrame.h"
michael@0: #include "nsIScrollbarMediator.h"
michael@0: #include "mozilla/LookAndFeel.h"
michael@0: #include "nsThemeConstants.h"
michael@0: #include "nsRenderingContext.h"
michael@0: #include "nsIContent.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: 
michael@0: //
michael@0: // NS_NewScrollbarFrame
michael@0: //
michael@0: // Creates a new scrollbar frame and returns it
michael@0: //
michael@0: nsIFrame*
michael@0: NS_NewScrollbarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
michael@0: {
michael@0:   return new (aPresShell) nsScrollbarFrame (aPresShell, aContext);
michael@0: }
michael@0: 
michael@0: NS_IMPL_FRAMEARENA_HELPERS(nsScrollbarFrame)
michael@0: 
michael@0: NS_QUERYFRAME_HEAD(nsScrollbarFrame)
michael@0:   NS_QUERYFRAME_ENTRY(nsScrollbarFrame)
michael@0: NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
michael@0: 
michael@0: void
michael@0: nsScrollbarFrame::Init(nsIContent* aContent,
michael@0:                        nsIFrame*   aParent,
michael@0:                        nsIFrame*   aPrevInFlow)
michael@0: {
michael@0:   nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
michael@0: 
michael@0:   // We want to be a reflow root since we use reflows to move the
michael@0:   // slider.  Any reflow inside the scrollbar frame will be a reflow to
michael@0:   // move the slider and will thus not change anything outside of the
michael@0:   // scrollbar or change the size of the scrollbar frame.
michael@0:   mState |= NS_FRAME_REFLOW_ROOT;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsScrollbarFrame::Reflow(nsPresContext*          aPresContext,
michael@0:                          nsHTMLReflowMetrics&     aDesiredSize,
michael@0:                          const nsHTMLReflowState& aReflowState,
michael@0:                          nsReflowStatus&          aStatus)
michael@0: {
michael@0:   nsresult rv = nsBoxFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
michael@0:   NS_ENSURE_SUCCESS(rv, rv);
michael@0: 
michael@0:   // nsGfxScrollFrame may have told us to shrink to nothing. If so, make sure our
michael@0:   // desired size agrees.
michael@0:   if (aReflowState.AvailableWidth() == 0) {
michael@0:     aDesiredSize.Width() = 0;
michael@0:   }
michael@0:   if (aReflowState.AvailableHeight() == 0) {
michael@0:     aDesiredSize.Height() = 0;
michael@0:   }
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: nsIAtom*
michael@0: nsScrollbarFrame::GetType() const
michael@0: {
michael@0:   return nsGkAtoms::scrollbarFrame;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsScrollbarFrame::AttributeChanged(int32_t aNameSpaceID,
michael@0:                                    nsIAtom* aAttribute,
michael@0:                                    int32_t aModType)
michael@0: {
michael@0:   nsresult rv = nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute,
michael@0:                                              aModType);
michael@0: 
michael@0:   // if the current position changes, notify any nsGfxScrollFrame
michael@0:   // parent we may have
michael@0:   if (aAttribute != nsGkAtoms::curpos)
michael@0:     return rv;
michael@0: 
michael@0:   nsIScrollableFrame* scrollable = do_QueryFrame(GetParent());
michael@0:   if (!scrollable)
michael@0:     return rv;
michael@0: 
michael@0:   nsCOMPtr<nsIContent> kungFuDeathGrip(mContent);
michael@0:   scrollable->CurPosAttributeChanged(mContent);
michael@0:   return rv;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsScrollbarFrame::HandlePress(nsPresContext* aPresContext,
michael@0:                               WidgetGUIEvent* aEvent,
michael@0:                               nsEventStatus* aEventStatus)
michael@0: {
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsScrollbarFrame::HandleMultiplePress(nsPresContext* aPresContext,
michael@0:                                       WidgetGUIEvent* aEvent,
michael@0:                                       nsEventStatus* aEventStatus,
michael@0:                                       bool aControlHeld)
michael@0: {
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP 
michael@0: nsScrollbarFrame::HandleDrag(nsPresContext* aPresContext,
michael@0:                              WidgetGUIEvent* aEvent,
michael@0:                              nsEventStatus* aEventStatus)
michael@0: {
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP 
michael@0: nsScrollbarFrame::HandleRelease(nsPresContext* aPresContext,
michael@0:                                 WidgetGUIEvent* aEvent,
michael@0:                                 nsEventStatus* aEventStatus)
michael@0: {
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsScrollbarFrame::SetScrollbarMediatorContent(nsIContent* aMediator)
michael@0: {
michael@0:   mScrollbarMediator = aMediator;
michael@0: }
michael@0: 
michael@0: nsIScrollbarMediator*
michael@0: nsScrollbarFrame::GetScrollbarMediator()
michael@0: {
michael@0:   if (!mScrollbarMediator)
michael@0:     return nullptr;
michael@0:   nsIFrame* f = mScrollbarMediator->GetPrimaryFrame();
michael@0: 
michael@0:   // check if the frame is a scroll frame. If so, get the scrollable frame
michael@0:   // inside it.
michael@0:   nsIScrollableFrame* scrollFrame = do_QueryFrame(f);
michael@0:   if (scrollFrame) {
michael@0:     f = scrollFrame->GetScrolledFrame();
michael@0:   }
michael@0: 
michael@0:   nsIScrollbarMediator* sbm = do_QueryFrame(f);
michael@0:   return sbm;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsScrollbarFrame::GetMargin(nsMargin& aMargin)
michael@0: {
michael@0:   aMargin.SizeTo(0,0,0,0);
michael@0: 
michael@0:   if (LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) != 0) {
michael@0:     nsPresContext* presContext = PresContext();
michael@0:     nsITheme* theme = presContext->GetTheme();
michael@0:     if (theme) {
michael@0:       nsIntSize size;
michael@0:       bool isOverridable;
michael@0:       nsRefPtr<nsRenderingContext> rc =
michael@0:         presContext->PresShell()->CreateReferenceRenderingContext();
michael@0:       theme->GetMinimumWidgetSize(rc, this, NS_THEME_SCROLLBAR, &size,
michael@0:                                   &isOverridable);
michael@0:       if (IsHorizontal()) {
michael@0:         aMargin.top = -presContext->DevPixelsToAppUnits(size.height);
michael@0:       }
michael@0:       else {
michael@0:         if (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
michael@0:           aMargin.right = -presContext->DevPixelsToAppUnits(size.width);
michael@0:         }
michael@0:         else {
michael@0:           aMargin.left = -presContext->DevPixelsToAppUnits(size.width);
michael@0:         }
michael@0:       }
michael@0:       return NS_OK;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   return nsBox::GetMargin(aMargin);
michael@0: }