author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 17 Sep 2010 09:07:27 +0300 | |
branch | RCL_3 |
changeset 1 | 9d347b658349 |
parent 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2004, 2006, 2007, 2008 Apple Inc. All rights reserved. |
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* Copyright (C) 2009 Holger Hans Peter Freyther |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef ScrollView_h |
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#define ScrollView_h |
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#include "IntRect.h" |
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#include "Scrollbar.h" |
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#include "ScrollbarClient.h" |
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#include "ScrollTypes.h" |
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#include "Widget.h" |
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#include <wtf/HashSet.h> |
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#if PLATFORM(MAC) && defined __OBJC__ |
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@protocol WebCoreFrameScrollView; |
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#endif |
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#if PLATFORM(GTK) |
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typedef struct _GtkAdjustment GtkAdjustment; |
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#endif |
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#if PLATFORM(WX) |
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class wxScrollWinEvent; |
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#endif |
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namespace WebCore { |
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class HostWindow; |
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class PlatformWheelEvent; |
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class Scrollbar; |
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class ScrollView : public Widget, public ScrollbarClient { |
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public: |
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~ScrollView(); |
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// ScrollbarClient function. FrameView overrides the other two. |
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virtual void valueChanged(Scrollbar*); |
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// The window thats hosts the ScrollView. The ScrollView will communicate scrolls and repaints to the |
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// host window in the window's coordinate space. |
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virtual HostWindow* hostWindow() const = 0; |
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// Returns a clip rect in host window coordinates. Used to clip the blit on a scroll. |
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virtual IntRect windowClipRect(bool clipToContents = true) const = 0; |
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// Functions for child manipulation and inspection. |
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const HashSet<RefPtr<Widget> >* children() const { return &m_children; } |
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void addChild(PassRefPtr<Widget>); |
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void removeChild(Widget*); |
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// If the scroll view does not use a native widget, then it will have cross-platform Scrollbars. These functions |
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// can be used to obtain those scrollbars. |
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Scrollbar* horizontalScrollbar() const { return m_horizontalScrollbar.get(); } |
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Scrollbar* verticalScrollbar() const { return m_verticalScrollbar.get(); } |
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bool isScrollViewScrollbar(const Widget* child) const { return horizontalScrollbar() == child || verticalScrollbar() == child; } |
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// Functions for setting and retrieving the scrolling mode in each axis (horizontal/vertical). The mode has values of |
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// AlwaysOff, AlwaysOn, and Auto. AlwaysOff means never show a scrollbar, AlwaysOn means always show a scrollbar. |
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// Auto means show a scrollbar only when one is needed. |
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// Note that for platforms with native widgets, these modes are considered advisory. In other words the underlying native |
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// widget may choose not to honor the requested modes. |
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void setScrollbarModes(ScrollbarMode horizontalMode, ScrollbarMode verticalMode, bool horizontalLock = false, bool verticalLock = false); |
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void setHorizontalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(mode, verticalScrollbarMode(), lock, verticalScrollbarLock()); } |
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void setVerticalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(horizontalScrollbarMode(), mode, horizontalScrollbarLock(), lock); }; |
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void scrollbarModes(ScrollbarMode& horizontalMode, ScrollbarMode& verticalMode) const; |
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ScrollbarMode horizontalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return horizontal; } |
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ScrollbarMode verticalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return vertical; } |
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void setHorizontalScrollbarLock(bool lock = true) { m_horizontalScrollbarLock = lock; } |
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bool horizontalScrollbarLock() const { return m_horizontalScrollbarLock; } |
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void setVerticalScrollbarLock(bool lock = true) { m_verticalScrollbarLock = lock; } |
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bool verticalScrollbarLock() const { return m_verticalScrollbarLock; } |
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void setScrollingModesLock(bool lock = true) { m_horizontalScrollbarLock = m_verticalScrollbarLock = lock; } |
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virtual void setCanHaveScrollbars(bool); |
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bool canHaveScrollbars() const { return horizontalScrollbarMode() != ScrollbarAlwaysOff || verticalScrollbarMode() != ScrollbarAlwaysOff; } |
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virtual bool avoidScrollbarCreation() { return false; } |
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// By default you only receive paint events for the area that is visible. In the case of using a |
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// tiled backing store, this function can be set, so that the view paints the entire contents. |
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bool paintsEntireContents() const { return m_paintsEntireContents; } |
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void setPaintsEntireContents(bool); |
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// Overridden by FrameView to create custom CSS scrollbars if applicable. |
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virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation); |
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// If the prohibits scrolling flag is set, then all scrolling in the view (even programmatic scrolling) is turned off. |
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void setProhibitsScrolling(bool b) { m_prohibitsScrolling = b; } |
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bool prohibitsScrolling() const { return m_prohibitsScrolling; } |
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// Whether or not a scroll view will blit visible contents when it is scrolled. Blitting is disabled in situations |
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// where it would cause rendering glitches (such as with fixed backgrounds or when the view is partially transparent). |
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void setCanBlitOnScroll(bool); |
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bool canBlitOnScroll() const; |
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// The visible content rect has a location that is the scrolled offset of the document. The width and height are the viewport width |
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// and height. By default the scrollbars themselves are excluded from this rectangle, but an optional boolean argument allows them to be |
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// included. |
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IntRect visibleContentRect(bool includeScrollbars = false) const; |
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int visibleWidth() const { return visibleContentRect().width(); } |
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int visibleHeight() const { return visibleContentRect().height(); } |
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// Functions for getting/setting the size webkit should use to layout the contents. By default this is the same as the visible |
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// content size. Explicitly setting a layout size value will cause webkit to layout the contents using this size instead. |
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int layoutWidth() const; |
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int layoutHeight() const; |
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IntSize fixedLayoutSize() const; |
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void setFixedLayoutSize(const IntSize&); |
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bool useFixedLayout() const; |
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void setUseFixedLayout(bool enable); |
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// Functions for getting/setting the size of the document contained inside the ScrollView (as an IntSize or as individual width and height |
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// values). |
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IntSize contentsSize() const; // Always at least as big as the visibleWidth()/visibleHeight(). |
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int contentsWidth() const { return contentsSize().width(); } |
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int contentsHeight() const { return contentsSize().height(); } |
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virtual void setContentsSize(const IntSize&); |
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// Functions for querying the current scrolled position (both as a point, a size, or as individual X and Y values). |
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IntPoint scrollPosition() const { return visibleContentRect().location(); } |
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IntSize scrollOffset() const { return visibleContentRect().location() - IntPoint(); } // Gets the scrolled position as an IntSize. Convenient for adding to other sizes. |
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IntPoint maximumScrollPosition() const; // The maximum position we can be scrolled to. |
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int scrollX() const { return scrollPosition().x(); } |
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int scrollY() const { return scrollPosition().y(); } |
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// Functions for scrolling the view. |
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void setScrollPosition(const IntPoint&); |
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void scrollBy(const IntSize& s) { return setScrollPosition(scrollPosition() + s); } |
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// This function scrolls by lines, pages or pixels. |
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bool scroll(ScrollDirection, ScrollGranularity); |
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// Scroll the actual contents of the view (either blitting or invalidating as needed). |
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void scrollContents(const IntSize& scrollDelta); |
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// This gives us a means of blocking painting on our scrollbars until the first layout has occurred. |
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void setScrollbarsSuppressed(bool suppressed, bool repaintOnUnsuppress = false); |
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bool scrollbarsSuppressed() const { return m_scrollbarsSuppressed; } |
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// Event coordinates are assumed to be in the coordinate space of a window that contains |
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// the entire widget hierarchy. It is up to the platform to decide what the precise definition |
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// of containing window is. (For example on Mac it is the containing NSWindow.) |
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IntPoint windowToContents(const IntPoint&) const; |
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IntPoint contentsToWindow(const IntPoint&) const; |
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IntRect windowToContents(const IntRect&) const; |
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IntRect contentsToWindow(const IntRect&) const; |
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// Functions for converting to and from screen coordinates. |
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IntRect contentsToScreen(const IntRect&) const; |
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IntPoint screenToContents(const IntPoint&) const; |
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// The purpose of this function is to answer whether or not the scroll view is currently visible. Animations and painting updates can be suspended if |
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// we know that we are either not in a window right now or if that window is not visible. |
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bool isOffscreen() const; |
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|
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// These functions are used to enable scrollbars to avoid window resizer controls that overlap the scroll view. This happens on Mac |
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// for example. |
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virtual IntRect windowResizerRect() const { return IntRect(); } |
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bool containsScrollbarsAvoidingResizer() const; |
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void adjustScrollbarsAvoidingResizerCount(int overlapDelta); |
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virtual void setParent(ScrollView*); // Overridden to update the overlapping scrollbar count. |
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// Called when our frame rect changes (or the rect/scroll position of an ancestor changes). |
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virtual void frameRectsChanged(); |
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// Widget override to update our scrollbars and notify our contents of the resize. |
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virtual void setFrameRect(const IntRect&); |
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// For platforms that need to hit test scrollbars from within the engine's event handlers (like Win32). |
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Scrollbar* scrollbarAtPoint(const IntPoint& windowPoint); |
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// This function exists for scrollviews that need to handle wheel events manually. |
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// On Mac the underlying NSScrollView just does the scrolling, but on other platforms |
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// (like Windows), we need this function in order to do the scroll ourselves. |
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void wheelEvent(PlatformWheelEvent&); |
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IntPoint convertChildToSelf(const Widget* child, const IntPoint& point) const |
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{ |
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IntPoint newPoint = point; |
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if (!isScrollViewScrollbar(child)) |
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newPoint = point - scrollOffset(); |
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newPoint.move(child->x(), child->y()); |
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return newPoint; |
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} |
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IntPoint convertSelfToChild(const Widget* child, const IntPoint& point) const |
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{ |
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IntPoint newPoint = point; |
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if (!isScrollViewScrollbar(child)) |
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newPoint = point + scrollOffset(); |
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newPoint.move(-child->x(), -child->y()); |
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return newPoint; |
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} |
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// Widget override. Handles painting of the contents of the view as well as the scrollbars. |
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virtual void paint(GraphicsContext*, const IntRect&); |
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void paintScrollbars(GraphicsContext*, const IntRect&); |
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// Widget overrides to ensure that our children's visibility status is kept up to date when we get shown and hidden. |
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virtual void show(); |
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virtual void hide(); |
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virtual void setParentVisible(bool); |
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// Pan scrolling. |
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static const int noPanScrollRadius = 15; |
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void addPanScrollIcon(const IntPoint&); |
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void removePanScrollIcon(); |
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void paintPanScrollIcon(GraphicsContext*); |
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virtual bool isPointInScrollbarCorner(const IntPoint&); |
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virtual bool scrollbarCornerPresent() const; |
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virtual IntRect convertFromScrollbarToContainingView(const Scrollbar*, const IntRect&) const; |
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virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar*, const IntRect&) const; |
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virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar*, const IntPoint&) const; |
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virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const; |
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protected: |
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ScrollView(); |
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virtual void repaintContentRectangle(const IntRect&, bool now = false); |
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virtual void paintContents(GraphicsContext*, const IntRect& damageRect) = 0; |
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virtual void contentsResized() = 0; |
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virtual void visibleContentsResized() = 0; |
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|
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// These functions are used to create/destroy scrollbars. |
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void setHasHorizontalScrollbar(bool); |
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void setHasVerticalScrollbar(bool); |
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IntRect scrollCornerRect() const; |
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virtual void updateScrollCorner(); |
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virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect); |
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|
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// Scroll the content by blitting the pixels |
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virtual bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect); |
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private: |
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RefPtr<Scrollbar> m_horizontalScrollbar; |
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RefPtr<Scrollbar> m_verticalScrollbar; |
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ScrollbarMode m_horizontalScrollbarMode; |
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ScrollbarMode m_verticalScrollbarMode; |
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bool m_horizontalScrollbarLock; |
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bool m_verticalScrollbarLock; |
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bool m_prohibitsScrolling; |
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HashSet<RefPtr<Widget> > m_children; |
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// This bool is unused on Mac OS because we directly ask the platform widget |
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// whether it is safe to blit on scroll. |
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bool m_canBlitOnScroll; |
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IntSize m_scrollOffset; // FIXME: Would rather store this as a position, but we will wait to make this change until more code is shared. |
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IntSize m_fixedLayoutSize; |
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IntSize m_contentsSize; |
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int m_scrollbarsAvoidingResizer; |
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bool m_scrollbarsSuppressed; |
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bool m_inUpdateScrollbars; |
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unsigned m_updateScrollbarsPass; |
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IntPoint m_panScrollIconPoint; |
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bool m_drawPanScrollIcon; |
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bool m_useFixedLayout; |
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bool m_paintsEntireContents; |
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void init(); |
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void destroy(); |
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// Called to update the scrollbars to accurately reflect the state of the view. |
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void updateScrollbars(const IntSize& desiredOffset); |
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// Called when the scroll position within this view changes. FrameView overrides this to generate repaint invalidations. |
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virtual void repaintFixedElementsAfterScrolling() {} |
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void platformInit(); |
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void platformDestroy(); |
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void platformAddChild(Widget*); |
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void platformRemoveChild(Widget*); |
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void platformSetScrollbarModes(); |
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void platformScrollbarModes(ScrollbarMode& horizontal, ScrollbarMode& vertical) const; |
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void platformSetCanBlitOnScroll(bool); |
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bool platformCanBlitOnScroll() const; |
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IntRect platformVisibleContentRect(bool includeScrollbars) const; |
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IntSize platformContentsSize() const; |
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void platformSetContentsSize(); |
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IntRect platformContentsToScreen(const IntRect&) const; |
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IntPoint platformScreenToContents(const IntPoint&) const; |
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void platformSetScrollPosition(const IntPoint&); |
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bool platformScroll(ScrollDirection, ScrollGranularity); |
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void platformSetScrollbarsSuppressed(bool repaintOnUnsuppress); |
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void platformRepaintContentRectangle(const IntRect&, bool now); |
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bool platformIsOffscreen() const; |
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#if PLATFORM(MAC) && defined __OBJC__ |
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public: |
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NSView* documentView() const; |
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private: |
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NSScrollView<WebCoreFrameScrollView>* scrollView() const; |
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#endif |
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#if PLATFORM(GTK) |
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public: |
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void setGtkAdjustments(GtkAdjustment* hadj, GtkAdjustment* vadj, bool resetValues = true); |
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GtkAdjustment* m_horizontalAdjustment; |
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GtkAdjustment* m_verticalAdjustment; |
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void setScrollOffset(const IntSize& offset) { m_scrollOffset = offset; } |
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#endif |
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#if PLATFORM(WX) |
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public: |
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virtual void setPlatformWidget(wxWindow*); |
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void adjustScrollbars(int x = -1, int y = -1, bool refresh = true); |
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private: |
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class ScrollViewPrivate; |
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ScrollViewPrivate* m_data; |
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#endif |
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}; // class ScrollView |
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} // namespace WebCore |
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#endif // ScrollView_h |