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3 * Copyright (C) 2009 Holger Hans Peter Freyther
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30 #include "platform/PlatformExport.h"
31 #include "platform/Widget.h"
32 #include "platform/geometry/IntRect.h"
33 #include "platform/scroll/ScrollTypes.h"
34 #include "platform/scroll/ScrollableArea.h"
35 #include "platform/scroll/Scrollbar.h"
37 #include "wtf/HashSet.h"
44 class PLATFORM_EXPORT ScrollView : public Widget, public ScrollableArea {
46 virtual ~ScrollView();
48 // ScrollableArea functions.
49 virtual int scrollSize(ScrollbarOrientation) const OVERRIDE;
50 virtual void setScrollOffset(const IntPoint&) OVERRIDE;
51 virtual bool isScrollCornerVisible() const OVERRIDE;
52 virtual void scrollbarStyleChanged(int newStyle, bool forceUpdate) OVERRIDE;
53 virtual bool userInputScrollable(ScrollbarOrientation) const OVERRIDE;
54 virtual bool shouldPlaceVerticalScrollbarOnLeft() const OVERRIDE;
56 virtual void notifyPageThatContentAreaWillPaint() const;
58 // NOTE: This should only be called by the overriden setScrollOffset from ScrollableArea.
59 virtual void scrollTo(const IntSize& newOffset);
61 // The window thats hosts the ScrollView. The ScrollView will communicate scrolls and repaints to the
62 // host window in the window's coordinate space.
63 virtual HostWindow* hostWindow() const = 0;
65 // Returns a clip rect in host window coordinates. Used to clip the blit on a scroll.
66 virtual IntRect windowClipRect(bool clipToContents = true) const = 0;
68 // Functions for child manipulation and inspection.
69 const HashSet<RefPtr<Widget> >* children() const { return &m_children; }
70 virtual void addChild(PassRefPtr<Widget>);
71 virtual void removeChild(Widget*);
73 // If the scroll view does not use a native widget, then it will have cross-platform Scrollbars. These functions
74 // can be used to obtain those scrollbars.
75 virtual Scrollbar* horizontalScrollbar() const OVERRIDE { return m_horizontalScrollbar.get(); }
76 virtual Scrollbar* verticalScrollbar() const OVERRIDE { return m_verticalScrollbar.get(); }
77 bool isScrollViewScrollbar(const Widget* child) const { return horizontalScrollbar() == child || verticalScrollbar() == child; }
79 void positionScrollbarLayers();
81 // Functions for setting and retrieving the scrolling mode in each axis (horizontal/vertical). The mode has values of
82 // AlwaysOff, AlwaysOn, and Auto. AlwaysOff means never show a scrollbar, AlwaysOn means always show a scrollbar.
83 // Auto means show a scrollbar only when one is needed.
84 // Note that for platforms with native widgets, these modes are considered advisory. In other words the underlying native
85 // widget may choose not to honor the requested modes.
86 void setScrollbarModes(ScrollbarMode horizontalMode, ScrollbarMode verticalMode, bool horizontalLock = false, bool verticalLock = false);
87 void setHorizontalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(mode, verticalScrollbarMode(), lock, verticalScrollbarLock()); }
88 void setVerticalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(horizontalScrollbarMode(), mode, horizontalScrollbarLock(), lock); };
89 void scrollbarModes(ScrollbarMode& horizontalMode, ScrollbarMode& verticalMode) const;
90 ScrollbarMode horizontalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return horizontal; }
91 ScrollbarMode verticalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return vertical; }
93 void setHorizontalScrollbarLock(bool lock = true) { m_horizontalScrollbarLock = lock; }
94 bool horizontalScrollbarLock() const { return m_horizontalScrollbarLock; }
95 void setVerticalScrollbarLock(bool lock = true) { m_verticalScrollbarLock = lock; }
96 bool verticalScrollbarLock() const { return m_verticalScrollbarLock; }
98 void setScrollingModesLock(bool lock = true) { m_horizontalScrollbarLock = m_verticalScrollbarLock = lock; }
100 virtual void setCanHaveScrollbars(bool);
101 bool canHaveScrollbars() const { return horizontalScrollbarMode() != ScrollbarAlwaysOff || verticalScrollbarMode() != ScrollbarAlwaysOff; }
103 // By default you only receive paint events for the area that is visible. In the case of using a
104 // tiled backing store, this function can be set, so that the view paints the entire contents.
105 bool paintsEntireContents() const { return m_paintsEntireContents; }
106 void setPaintsEntireContents(bool);
108 // By default, paint events are clipped to the visible area. If set to
109 // false, paint events are no longer clipped. paintsEntireContents() implies !clipsRepaints().
110 bool clipsRepaints() const { return m_clipsRepaints; }
111 void setClipsRepaints(bool);
113 // Overridden by FrameView to create custom CSS scrollbars if applicable.
114 virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
116 // Whether or not a scroll view will blit visible contents when it is scrolled. Blitting is disabled in situations
117 // where it would cause rendering glitches (such as with fixed backgrounds or when the view is partially transparent).
118 void setCanBlitOnScroll(bool);
119 bool canBlitOnScroll() const;
121 // The visible content rect has a location that is the scrolled offset of the document. The width and height are the viewport width
122 // and height. By default the scrollbars themselves are excluded from this rectangle, but an optional boolean argument allows them to be
124 virtual IntRect visibleContentRect(IncludeScrollbarsInRect = ExcludeScrollbars) const OVERRIDE;
125 IntSize visibleSize() const { return visibleContentRect().size(); }
126 virtual int visibleWidth() const OVERRIDE { return visibleContentRect().width(); }
127 virtual int visibleHeight() const OVERRIDE { return visibleContentRect().height(); }
129 // visibleContentRect().size() is computed from unscaledVisibleContentSize() divided by the value of visibleContentScaleFactor.
130 // For the main frame, visibleContentScaleFactor is equal to the page's pageScaleFactor; it's 1 otherwise.
131 IntSize unscaledVisibleContentSize(IncludeScrollbarsInRect = ExcludeScrollbars) const;
132 virtual float visibleContentScaleFactor() const { return 1; }
134 // Offset used to convert incoming input events while emulating device metics.
135 virtual IntSize inputEventsOffsetForEmulation() const { return IntSize(); }
137 // Scale used to convert incoming input events. Usually the same as visibleContentScaleFactor(), unless specifically changed.
138 virtual float inputEventsScaleFactor() const { return visibleContentScaleFactor(); }
140 // Functions for getting/setting the size of the document contained inside the ScrollView (as an IntSize or as individual width and height
142 virtual IntSize contentsSize() const OVERRIDE; // Always at least as big as the visibleWidth()/visibleHeight().
143 int contentsWidth() const { return contentsSize().width(); }
144 int contentsHeight() const { return contentsSize().height(); }
145 virtual void setContentsSize(const IntSize&);
147 // Functions for querying the current scrolled position (both as a point, a size, or as individual X and Y values).
148 virtual IntPoint scrollPosition() const OVERRIDE { return visibleContentRect().location(); }
149 IntSize scrollOffset() const { return toIntSize(visibleContentRect().location()); } // Gets the scrolled position as an IntSize. Convenient for adding to other sizes.
150 virtual IntPoint maximumScrollPosition() const OVERRIDE; // The maximum position we can be scrolled to.
151 virtual IntPoint minimumScrollPosition() const OVERRIDE; // The minimum position we can be scrolled to.
152 // Adjust the passed in scroll position to keep it between the minimum and maximum positions.
153 IntPoint adjustScrollPositionWithinRange(const IntPoint&) const;
154 int scrollX() const { return scrollPosition().x(); }
155 int scrollY() const { return scrollPosition().y(); }
157 virtual IntSize overhangAmount() const OVERRIDE;
159 void cacheCurrentScrollPosition() { m_cachedScrollPosition = scrollPosition(); }
160 IntPoint cachedScrollPosition() const { return m_cachedScrollPosition; }
162 // Functions for scrolling the view.
163 virtual void setScrollPosition(const IntPoint&);
164 void scrollBy(const IntSize& s) { return setScrollPosition(scrollPosition() + s); }
166 bool scroll(ScrollDirection, ScrollGranularity);
168 // Scroll the actual contents of the view (either blitting or invalidating as needed).
169 void scrollContents(const IntSize& scrollDelta);
171 // This gives us a means of blocking painting on our scrollbars until the first layout has occurred.
172 void setScrollbarsSuppressed(bool suppressed, bool repaintOnUnsuppress = false);
173 bool scrollbarsSuppressed() const { return m_scrollbarsSuppressed; }
175 IntPoint rootViewToContents(const IntPoint&) const;
176 IntPoint contentsToRootView(const IntPoint&) const;
177 IntRect rootViewToContents(const IntRect&) const;
178 IntRect contentsToRootView(const IntRect&) const;
180 // Event coordinates are assumed to be in the coordinate space of a window that contains
181 // the entire widget hierarchy. It is up to the platform to decide what the precise definition
182 // of containing window is. (For example on Mac it is the containing NSWindow.)
183 IntPoint windowToContents(const IntPoint&) const;
184 IntPoint contentsToWindow(const IntPoint&) const;
185 IntRect windowToContents(const IntRect&) const;
186 IntRect contentsToWindow(const IntRect&) const;
188 // Functions for converting to screen coordinates.
189 IntRect contentsToScreen(const IntRect&) const;
191 // These functions are used to enable scrollbars to avoid window resizer controls that overlap the scroll view. This happens on Mac
193 virtual IntRect windowResizerRect() const { return IntRect(); }
194 bool containsScrollbarsAvoidingResizer() const;
195 void adjustScrollbarsAvoidingResizerCount(int overlapDelta);
196 void windowResizerRectChanged();
198 virtual void setParent(Widget*) OVERRIDE; // Overridden to update the overlapping scrollbar count.
200 // Called when our frame rect changes (or the rect/scroll position of an ancestor changes).
201 virtual void frameRectsChanged() OVERRIDE;
203 // Widget override to update our scrollbars and notify our contents of the resize.
204 virtual void setFrameRect(const IntRect&) OVERRIDE;
206 // For platforms that need to hit test scrollbars from within the engine's event handlers (like Win32).
207 Scrollbar* scrollbarAtPoint(const IntPoint& windowPoint);
209 virtual IntPoint convertChildToSelf(const Widget* child, const IntPoint& point) const OVERRIDE
211 IntPoint newPoint = point;
212 if (!isScrollViewScrollbar(child))
213 newPoint = point - scrollOffset();
214 newPoint.moveBy(child->location());
218 virtual IntPoint convertSelfToChild(const Widget* child, const IntPoint& point) const OVERRIDE
220 IntPoint newPoint = point;
221 if (!isScrollViewScrollbar(child))
222 newPoint = point + scrollOffset();
223 newPoint.moveBy(-child->location());
227 // Widget override. Handles painting of the contents of the view as well as the scrollbars.
228 virtual void paint(GraphicsContext*, const IntRect&) OVERRIDE;
229 void paintScrollbars(GraphicsContext*, const IntRect&);
231 // Widget overrides to ensure that our children's visibility status is kept up to date when we get shown and hidden.
232 virtual void show() OVERRIDE;
233 virtual void hide() OVERRIDE;
234 virtual void setParentVisible(bool) OVERRIDE;
237 static const int noPanScrollRadius = 15;
238 void addPanScrollIcon(const IntPoint&);
239 void removePanScrollIcon();
240 void paintPanScrollIcon(GraphicsContext*);
242 virtual bool isPointInScrollbarCorner(const IntPoint&);
243 virtual bool scrollbarCornerPresent() const;
244 virtual IntRect scrollCornerRect() const OVERRIDE;
245 virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect);
246 virtual void paintScrollbar(GraphicsContext*, Scrollbar*, const IntRect&);
248 virtual IntRect convertFromScrollbarToContainingView(const Scrollbar*, const IntRect&) const OVERRIDE;
249 virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar*, const IntRect&) const OVERRIDE;
250 virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar*, const IntPoint&) const OVERRIDE;
251 virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const OVERRIDE;
253 void calculateAndPaintOverhangAreas(GraphicsContext*, const IntRect& dirtyRect);
254 void calculateAndPaintOverhangBackground(GraphicsContext*, const IntRect& dirtyRect);
256 virtual bool isScrollView() const OVERRIDE FINAL { return true; }
261 virtual void repaintContentRectangle(const IntRect&);
262 virtual void paintContents(GraphicsContext*, const IntRect& damageRect) = 0;
264 virtual void paintOverhangAreas(GraphicsContext*, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect);
266 virtual void scrollbarExistenceDidChange() = 0;
267 // These functions are used to create/destroy scrollbars.
268 void setHasHorizontalScrollbar(bool);
269 void setHasVerticalScrollbar(bool);
271 virtual void updateScrollCorner();
272 virtual void invalidateScrollCornerRect(const IntRect&) OVERRIDE;
274 // Scroll the content by blitting the pixels.
275 virtual bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect);
276 // Scroll the content by invalidating everything.
277 virtual void scrollContentsSlowPath(const IntRect& updateRect);
279 void setScrollOrigin(const IntPoint&, bool updatePositionAtAll, bool updatePositionSynchronously);
281 // Subclassed by FrameView to check the writing-mode of the document.
282 virtual bool isVerticalDocument() const { return true; }
283 virtual bool isFlippedDocument() const { return false; }
285 // Called to update the scrollbars to accurately reflect the state of the view.
286 void updateScrollbars(const IntSize& desiredOffset);
288 IntSize excludeScrollbars(const IntSize&) const;
291 RefPtr<Scrollbar> m_horizontalScrollbar;
292 RefPtr<Scrollbar> m_verticalScrollbar;
293 ScrollbarMode m_horizontalScrollbarMode;
294 ScrollbarMode m_verticalScrollbarMode;
296 bool m_horizontalScrollbarLock;
297 bool m_verticalScrollbarLock;
299 HashSet<RefPtr<Widget> > m_children;
301 // This bool is unused on Mac OS because we directly ask the platform widget
302 // whether it is safe to blit on scroll.
303 bool m_canBlitOnScroll;
305 IntSize m_scrollOffset; // FIXME: Would rather store this as a position, but we will wait to make this change until more code is shared.
306 IntPoint m_cachedScrollPosition;
307 IntSize m_contentsSize;
309 int m_scrollbarsAvoidingResizer;
310 bool m_scrollbarsSuppressed;
312 bool m_inUpdateScrollbars;
313 unsigned m_updateScrollbarsPass;
315 IntPoint m_panScrollIconPoint;
316 bool m_drawPanScrollIcon;
318 bool m_paintsEntireContents;
319 bool m_clipsRepaints;
324 IntRect rectToCopyOnScroll() const;
326 // Called when the scroll position within this view changes. FrameView overrides this to generate repaint invalidations.
327 virtual void repaintFixedElementsAfterScrolling() { }
328 virtual void updateFixedElementsAfterScrolling() { }
330 void calculateOverhangAreasForPainting(IntRect& horizontalOverhangRect, IntRect& verticalOverhangRect);
331 void updateOverhangAreas();
333 virtual int pageStep(ScrollbarOrientation) const OVERRIDE;
334 }; // class ScrollView
336 DEFINE_TYPE_CASTS(ScrollView, Widget, widget, widget->isScrollView(), widget.isScrollView());
338 } // namespace WebCore
340 #endif // ScrollView_h