2 * Copyright (C) 2004, 2006, 2007, 2008 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Holger Hans Peter Freyther
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31 #include "Scrollbar.h"
32 #include "ScrollableArea.h"
33 #include "ScrollTypes.h"
36 #include <wtf/HashSet.h>
38 #if PLATFORM(MAC) && defined __OBJC__
39 @protocol WebCoreFrameScrollView;
43 #include "GRefPtrGtk.h"
44 typedef struct _GtkAdjustment GtkAdjustment;
48 class wxScrollWinEvent;
56 class ScrollView : public Widget, public ScrollableArea {
60 // ScrollableArea functions. FrameView overrides the others.
61 virtual int scrollSize(ScrollbarOrientation orientation) const;
62 virtual int scrollPosition(Scrollbar*) const;
63 virtual void setScrollOffset(const IntPoint&);
64 virtual void didCompleteRubberBand(const IntSize&) const;
66 // NOTE: This should only be called by the overriden setScrollOffset from ScrollableArea.
67 virtual void scrollTo(const IntSize& newOffset);
69 // The window thats hosts the ScrollView. The ScrollView will communicate scrolls and repaints to the
70 // host window in the window's coordinate space.
71 virtual HostWindow* hostWindow() const = 0;
73 // Returns a clip rect in host window coordinates. Used to clip the blit on a scroll.
74 virtual IntRect windowClipRect(bool clipToContents = true) const = 0;
76 // Functions for child manipulation and inspection.
77 const HashSet<RefPtr<Widget> >* children() const { return &m_children; }
78 void addChild(PassRefPtr<Widget>);
79 void removeChild(Widget*);
81 // If the scroll view does not use a native widget, then it will have cross-platform Scrollbars. These functions
82 // can be used to obtain those scrollbars.
83 virtual Scrollbar* horizontalScrollbar() const { return m_horizontalScrollbar.get(); }
84 virtual Scrollbar* verticalScrollbar() const { return m_verticalScrollbar.get(); }
85 bool isScrollViewScrollbar(const Widget* child) const { return horizontalScrollbar() == child || verticalScrollbar() == child; }
87 // Functions for setting and retrieving the scrolling mode in each axis (horizontal/vertical). The mode has values of
88 // AlwaysOff, AlwaysOn, and Auto. AlwaysOff means never show a scrollbar, AlwaysOn means always show a scrollbar.
89 // Auto means show a scrollbar only when one is needed.
90 // Note that for platforms with native widgets, these modes are considered advisory. In other words the underlying native
91 // widget may choose not to honor the requested modes.
92 void setScrollbarModes(ScrollbarMode horizontalMode, ScrollbarMode verticalMode, bool horizontalLock = false, bool verticalLock = false);
93 void setHorizontalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(mode, verticalScrollbarMode(), lock, verticalScrollbarLock()); }
94 void setVerticalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(horizontalScrollbarMode(), mode, horizontalScrollbarLock(), lock); };
95 void scrollbarModes(ScrollbarMode& horizontalMode, ScrollbarMode& verticalMode) const;
96 ScrollbarMode horizontalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return horizontal; }
97 ScrollbarMode verticalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return vertical; }
99 void setHorizontalScrollbarLock(bool lock = true) { m_horizontalScrollbarLock = lock; }
100 bool horizontalScrollbarLock() const { return m_horizontalScrollbarLock; }
101 void setVerticalScrollbarLock(bool lock = true) { m_verticalScrollbarLock = lock; }
102 bool verticalScrollbarLock() const { return m_verticalScrollbarLock; }
104 void setScrollingModesLock(bool lock = true) { m_horizontalScrollbarLock = m_verticalScrollbarLock = lock; }
106 virtual void setCanHaveScrollbars(bool);
107 bool canHaveScrollbars() const { return horizontalScrollbarMode() != ScrollbarAlwaysOff || verticalScrollbarMode() != ScrollbarAlwaysOff; }
109 virtual bool avoidScrollbarCreation() const { return false; }
111 // By default you only receive paint events for the area that is visible. In the case of using a
112 // tiled backing store, this function can be set, so that the view paints the entire contents.
113 bool paintsEntireContents() const { return m_paintsEntireContents; }
114 void setPaintsEntireContents(bool);
116 // By default, paint events are clipped to the visible area. If set to
117 // false, paint events are no longer clipped. paintsEntireContents() implies !clipsRepaints().
118 bool clipsRepaints() const { return m_clipsRepaints; }
119 void setClipsRepaints(bool);
121 // By default programmatic scrolling is handled by WebCore and not by the UI application.
122 // In the case of using a tiled backing store, this mode can be set, so that the scroll requests
123 // are delegated to the UI application.
124 bool delegatesScrolling() const { return m_delegatesScrolling; }
125 void setDelegatesScrolling(bool);
127 // Overridden by FrameView to create custom CSS scrollbars if applicable.
128 virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
130 // If the prohibits scrolling flag is set, then all scrolling in the view (even programmatic scrolling) is turned off.
131 void setProhibitsScrolling(bool b) { m_prohibitsScrolling = b; }
132 bool prohibitsScrolling() const { return m_prohibitsScrolling; }
134 // Whether or not a scroll view will blit visible contents when it is scrolled. Blitting is disabled in situations
135 // where it would cause rendering glitches (such as with fixed backgrounds or when the view is partially transparent).
136 void setCanBlitOnScroll(bool);
137 bool canBlitOnScroll() const;
139 // The visible content rect has a location that is the scrolled offset of the document. The width and height are the viewport width
140 // and height. By default the scrollbars themselves are excluded from this rectangle, but an optional boolean argument allows them to be
142 // In the situation the client is responsible for the scrolling (ie. with a tiled backing store) it is possible to use
143 // the actualVisibleContentRect instead, though this must be updated manually, e.g after panning ends.
144 IntRect visibleContentRect(bool includeScrollbars = false) const;
145 IntRect actualVisibleContentRect() const { return m_actualVisibleContentRect.isEmpty() ? visibleContentRect() : m_actualVisibleContentRect; }
146 void setActualVisibleContentRect(const IntRect& actualVisibleContentRect) { m_actualVisibleContentRect = actualVisibleContentRect; }
147 int visibleWidth() const { return visibleContentRect().width(); }
148 int visibleHeight() const { return visibleContentRect().height(); }
150 // Functions for getting/setting the size webkit should use to layout the contents. By default this is the same as the visible
151 // content size. Explicitly setting a layout size value will cause webkit to layout the contents using this size instead.
152 int layoutWidth() const;
153 int layoutHeight() const;
154 IntSize fixedLayoutSize() const;
155 void setFixedLayoutSize(const IntSize&);
156 bool useFixedLayout() const;
157 void setUseFixedLayout(bool enable);
159 // Functions for getting/setting the size of the document contained inside the ScrollView (as an IntSize or as individual width and height
161 IntSize contentsSize() const; // Always at least as big as the visibleWidth()/visibleHeight().
162 int contentsWidth() const { return contentsSize().width(); }
163 int contentsHeight() const { return contentsSize().height(); }
164 virtual void setContentsSize(const IntSize&);
166 #if PLATFORM(ANDROID)
167 int actualWidth() const;
168 int actualHeight() const;
169 int actualScrollX() const;
170 int actualScrollY() const;
173 // Functions for querying the current scrolled position (both as a point, a size, or as individual X and Y values).
174 IntPoint scrollPosition() const { return visibleContentRect().location(); }
175 IntSize scrollOffset() const { return visibleContentRect().location() - IntPoint(); } // Gets the scrolled position as an IntSize. Convenient for adding to other sizes.
176 IntPoint maximumScrollPosition() const; // The maximum position we can be scrolled to.
177 IntPoint minimumScrollPosition() const; // The minimum position we can be scrolled to.
178 // Adjust the passed in scroll position to keep it between the minimum and maximum positions.
179 IntPoint adjustScrollPositionWithinRange(const IntPoint&) const;
180 int scrollX() const { return scrollPosition().x(); }
181 int scrollY() const { return scrollPosition().y(); }
183 IntSize overhangAmount() const;
185 // Functions for scrolling the view.
186 void setScrollPosition(const IntPoint&);
187 void scrollBy(const IntSize& s) { return setScrollPosition(scrollPosition() + s); }
189 // This function scrolls by lines, pages or pixels.
190 bool scroll(ScrollDirection, ScrollGranularity);
192 // A logical scroll that just ends up calling the corresponding physical scroll() based off the document's writing mode.
193 bool logicalScroll(ScrollLogicalDirection, ScrollGranularity);
195 // Scroll the actual contents of the view (either blitting or invalidating as needed).
196 void scrollContents(const IntSize& scrollDelta);
198 // This gives us a means of blocking painting on our scrollbars until the first layout has occurred.
199 void setScrollbarsSuppressed(bool suppressed, bool repaintOnUnsuppress = false);
200 bool scrollbarsSuppressed() const { return m_scrollbarsSuppressed; }
202 // Event coordinates are assumed to be in the coordinate space of a window that contains
203 // the entire widget hierarchy. It is up to the platform to decide what the precise definition
204 // of containing window is. (For example on Mac it is the containing NSWindow.)
205 IntPoint windowToContents(const IntPoint&) const;
206 IntPoint contentsToWindow(const IntPoint&) const;
207 IntRect windowToContents(const IntRect&) const;
208 IntRect contentsToWindow(const IntRect&) const;
210 // Functions for converting to and from screen coordinates.
211 IntRect contentsToScreen(const IntRect&) const;
212 IntPoint screenToContents(const IntPoint&) const;
214 // 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
215 // we know that we are either not in a window right now or if that window is not visible.
216 bool isOffscreen() const;
218 // These functions are used to enable scrollbars to avoid window resizer controls that overlap the scroll view. This happens on Mac
220 virtual IntRect windowResizerRect() const { return IntRect(); }
221 bool containsScrollbarsAvoidingResizer() const;
222 void adjustScrollbarsAvoidingResizerCount(int overlapDelta);
223 void windowResizerRectChanged();
225 virtual void setParent(ScrollView*); // Overridden to update the overlapping scrollbar count.
227 // Called when our frame rect changes (or the rect/scroll position of an ancestor changes).
228 virtual void frameRectsChanged();
230 // Widget override to update our scrollbars and notify our contents of the resize.
231 virtual void setFrameRect(const IntRect&);
232 virtual void setBoundsSize(const IntSize&);
234 // For platforms that need to hit test scrollbars from within the engine's event handlers (like Win32).
235 Scrollbar* scrollbarAtPoint(const IntPoint& windowPoint);
237 // This function exists for scrollviews that need to handle wheel events manually.
238 // On Mac the underlying NSScrollView just does the scrolling, but on other platforms
239 // (like Windows), we need this function in order to do the scroll ourselves.
240 void wheelEvent(PlatformWheelEvent&);
241 #if ENABLE(GESTURE_EVENTS)
242 void gestureEvent(const PlatformGestureEvent&);
245 IntPoint convertChildToSelf(const Widget* child, const IntPoint& point) const
247 IntPoint newPoint = point;
248 if (!isScrollViewScrollbar(child))
249 newPoint = point - scrollOffset();
250 newPoint.move(child->x(), child->y());
254 IntPoint convertSelfToChild(const Widget* child, const IntPoint& point) const
256 IntPoint newPoint = point;
257 if (!isScrollViewScrollbar(child))
258 newPoint = point + scrollOffset();
259 newPoint.move(-child->x(), -child->y());
263 // Widget override. Handles painting of the contents of the view as well as the scrollbars.
264 virtual void paint(GraphicsContext*, const IntRect&);
265 void paintScrollbars(GraphicsContext*, const IntRect&);
267 // Widget overrides to ensure that our children's visibility status is kept up to date when we get shown and hidden.
270 virtual void setParentVisible(bool);
273 static const int noPanScrollRadius = 15;
274 void addPanScrollIcon(const IntPoint&);
275 void removePanScrollIcon();
276 void paintPanScrollIcon(GraphicsContext*);
278 virtual bool isPointInScrollbarCorner(const IntPoint&);
279 virtual bool scrollbarCornerPresent() const;
281 virtual IntRect convertFromScrollbarToContainingView(const Scrollbar*, const IntRect&) const;
282 virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar*, const IntRect&) const;
283 virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar*, const IntPoint&) const;
284 virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const;
289 virtual void repaintContentRectangle(const IntRect&, bool now = false);
290 virtual void paintContents(GraphicsContext*, const IntRect& damageRect) = 0;
292 void calculateOverhangAreasForPainting(IntRect& horizontalOverhangRect, IntRect& verticalOverhangRect);
293 virtual void paintOverhangAreas(GraphicsContext*, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect);
295 virtual void contentsResized() = 0;
296 virtual void visibleContentsResized() = 0;
298 IntSize boundsSize() const { return m_boundsSize; }
299 void setInitialBoundsSize(const IntSize&);
301 // These functions are used to create/destroy scrollbars.
302 void setHasHorizontalScrollbar(bool);
303 void setHasVerticalScrollbar(bool);
305 IntRect scrollCornerRect() const;
306 virtual void updateScrollCorner();
307 virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect);
309 // Scroll the content by blitting the pixels.
310 virtual bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect);
311 // Scroll the content by invalidating everything.
312 virtual void scrollContentsSlowPath(const IntRect& updateRect);
314 void setScrollOrigin(const IntPoint&, bool updatePositionAtAll, bool updatePositionSynchronously);
315 IntPoint scrollOrigin() { return m_scrollOrigin; }
317 // Subclassed by FrameView to check the writing-mode of the document.
318 virtual bool isVerticalDocument() const { return true; }
319 virtual bool isFlippedDocument() const { return false; }
322 RefPtr<Scrollbar> m_horizontalScrollbar;
323 RefPtr<Scrollbar> m_verticalScrollbar;
324 ScrollbarMode m_horizontalScrollbarMode;
325 ScrollbarMode m_verticalScrollbarMode;
327 bool m_horizontalScrollbarLock;
328 bool m_verticalScrollbarLock;
330 bool m_prohibitsScrolling;
332 HashSet<RefPtr<Widget> > m_children;
334 // This bool is unused on Mac OS because we directly ask the platform widget
335 // whether it is safe to blit on scroll.
336 bool m_canBlitOnScroll;
338 IntRect m_actualVisibleContentRect;
339 IntSize m_scrollOffset; // FIXME: Would rather store this as a position, but we will wait to make this change until more code is shared.
340 IntSize m_fixedLayoutSize;
341 IntSize m_contentsSize;
343 int m_scrollbarsAvoidingResizer;
344 bool m_scrollbarsSuppressed;
346 bool m_inUpdateScrollbars;
347 unsigned m_updateScrollbarsPass;
349 IntPoint m_panScrollIconPoint;
350 bool m_drawPanScrollIcon;
351 bool m_useFixedLayout;
353 bool m_paintsEntireContents;
354 bool m_clipsRepaints;
355 bool m_delegatesScrolling;
357 // There are 8 possible combinations of writing mode and direction. Scroll origin will be non-zero in the x or y axis
358 // if there is any reversed direction or writing-mode. The combinations are:
359 // writing-mode / direction scrollOrigin.x() set scrollOrigin.y() set
360 // horizontal-tb / ltr NO NO
361 // horizontal-tb / rtl YES NO
362 // horizontal-bt / ltr NO YES
363 // horizontal-bt / rtl YES YES
364 // vertical-lr / ltr NO NO
365 // vertical-lr / rtl NO YES
366 // vertical-rl / ltr YES NO
367 // vertical-rl / rtl YES YES
368 IntPoint m_scrollOrigin;
370 IntSize m_boundsSize;
375 // Called to update the scrollbars to accurately reflect the state of the view.
376 void updateScrollbars(const IntSize& desiredOffset);
378 // Called when the scroll position within this view changes. FrameView overrides this to generate repaint invalidations.
379 virtual void repaintFixedElementsAfterScrolling() {}
382 void platformDestroy();
383 void platformAddChild(Widget*);
384 void platformRemoveChild(Widget*);
385 void platformSetScrollbarModes();
386 void platformScrollbarModes(ScrollbarMode& horizontal, ScrollbarMode& vertical) const;
387 void platformSetCanBlitOnScroll(bool);
388 bool platformCanBlitOnScroll() const;
389 IntRect platformVisibleContentRect(bool includeScrollbars) const;
390 IntSize platformContentsSize() const;
391 void platformSetContentsSize();
392 IntRect platformContentsToScreen(const IntRect&) const;
393 IntPoint platformScreenToContents(const IntPoint&) const;
394 void platformSetScrollPosition(const IntPoint&);
395 bool platformScroll(ScrollDirection, ScrollGranularity);
396 void platformSetScrollbarsSuppressed(bool repaintOnUnsuppress);
397 void platformRepaintContentRectangle(const IntRect&, bool now);
398 bool platformIsOffscreen() const;
400 void platformSetScrollOrigin(const IntPoint&, bool updatePositionAtAll, bool updatePositionSynchronously);
402 #if PLATFORM(ANDROID)
403 int platformActualWidth() const;
404 int platformActualHeight() const;
405 int platformActualScrollX() const;
406 int platformActualScrollY() const;
409 #if PLATFORM(MAC) && defined __OBJC__
411 NSView* documentView() const;
414 NSScrollView<WebCoreFrameScrollView>* scrollView() const;
419 void setGtkAdjustments(GtkAdjustment* hadj, GtkAdjustment* vadj, bool resetValues = true);
420 void setHorizontalAdjustment(GtkAdjustment* hadj, bool resetValues = true);
421 void setVerticalAdjustment(GtkAdjustment* vadj, bool resetValues = true);
422 void setScrollOffset(const IntSize& offset) { m_scrollOffset = offset; }
425 GRefPtr<GtkAdjustment> m_horizontalAdjustment;
426 GRefPtr<GtkAdjustment> m_verticalAdjustment;
431 virtual void setPlatformWidget(wxWindow*);
432 void adjustScrollbars(int x = -1, int y = -1, bool refresh = true);
434 class ScrollViewPrivate;
435 ScrollViewPrivate* m_data;
438 #ifdef ANDROID_CAPTURE_OFFSCREEN_PAINTS
440 // capture parts of rect not contained by vis
441 void platformOffscreenContentRectangle(const IntRect& vis,
442 const IntRect& rect);
444 }; // class ScrollView
446 } // namespace WebCore
448 #endif // ScrollView_h