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 // Functions for querying the current scrolled position, negating the effects of overhang.
184 int scrollXForFixedPosition() const;
185 int scrollYForFixedPosition() const;
186 IntSize scrollOffsetForFixedPosition() const;
188 IntSize overhangAmount() const;
190 // Functions for scrolling the view.
191 void setScrollPosition(const IntPoint&);
192 void scrollBy(const IntSize& s) { return setScrollPosition(scrollPosition() + s); }
194 // This function scrolls by lines, pages or pixels.
195 bool scroll(ScrollDirection, ScrollGranularity);
197 // A logical scroll that just ends up calling the corresponding physical scroll() based off the document's writing mode.
198 bool logicalScroll(ScrollLogicalDirection, ScrollGranularity);
200 // Scroll the actual contents of the view (either blitting or invalidating as needed).
201 void scrollContents(const IntSize& scrollDelta);
203 // This gives us a means of blocking painting on our scrollbars until the first layout has occurred.
204 void setScrollbarsSuppressed(bool suppressed, bool repaintOnUnsuppress = false);
205 bool scrollbarsSuppressed() const { return m_scrollbarsSuppressed; }
207 // Event coordinates are assumed to be in the coordinate space of a window that contains
208 // the entire widget hierarchy. It is up to the platform to decide what the precise definition
209 // of containing window is. (For example on Mac it is the containing NSWindow.)
210 IntPoint windowToContents(const IntPoint&) const;
211 IntPoint contentsToWindow(const IntPoint&) const;
212 IntRect windowToContents(const IntRect&) const;
213 IntRect contentsToWindow(const IntRect&) const;
215 // Functions for converting to and from screen coordinates.
216 IntRect contentsToScreen(const IntRect&) const;
217 IntPoint screenToContents(const IntPoint&) const;
219 // 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
220 // we know that we are either not in a window right now or if that window is not visible.
221 bool isOffscreen() const;
223 // These functions are used to enable scrollbars to avoid window resizer controls that overlap the scroll view. This happens on Mac
225 virtual IntRect windowResizerRect() const { return IntRect(); }
226 bool containsScrollbarsAvoidingResizer() const;
227 void adjustScrollbarsAvoidingResizerCount(int overlapDelta);
228 void windowResizerRectChanged();
230 virtual void setParent(ScrollView*); // Overridden to update the overlapping scrollbar count.
232 // Called when our frame rect changes (or the rect/scroll position of an ancestor changes).
233 virtual void frameRectsChanged();
235 // Widget override to update our scrollbars and notify our contents of the resize.
236 virtual void setFrameRect(const IntRect&);
238 // For platforms that need to hit test scrollbars from within the engine's event handlers (like Win32).
239 Scrollbar* scrollbarAtPoint(const IntPoint& windowPoint);
241 // This function exists for scrollviews that need to handle wheel events manually.
242 // On Mac the underlying NSScrollView just does the scrolling, but on other platforms
243 // (like Windows), we need this function in order to do the scroll ourselves.
244 void wheelEvent(PlatformWheelEvent&);
245 #if ENABLE(GESTURE_EVENTS)
246 void gestureEvent(const PlatformGestureEvent&);
249 IntPoint convertChildToSelf(const Widget* child, const IntPoint& point) const
251 IntPoint newPoint = point;
252 if (!isScrollViewScrollbar(child))
253 newPoint = point - scrollOffset();
254 newPoint.move(child->x(), child->y());
258 IntPoint convertSelfToChild(const Widget* child, const IntPoint& point) const
260 IntPoint newPoint = point;
261 if (!isScrollViewScrollbar(child))
262 newPoint = point + scrollOffset();
263 newPoint.move(-child->x(), -child->y());
267 // Widget override. Handles painting of the contents of the view as well as the scrollbars.
268 virtual void paint(GraphicsContext*, const IntRect&);
269 void paintScrollbars(GraphicsContext*, const IntRect&);
271 // Widget overrides to ensure that our children's visibility status is kept up to date when we get shown and hidden.
274 virtual void setParentVisible(bool);
277 static const int noPanScrollRadius = 15;
278 void addPanScrollIcon(const IntPoint&);
279 void removePanScrollIcon();
280 void paintPanScrollIcon(GraphicsContext*);
282 virtual bool isPointInScrollbarCorner(const IntPoint&);
283 virtual bool scrollbarCornerPresent() const;
285 virtual IntRect convertFromScrollbarToContainingView(const Scrollbar*, const IntRect&) const;
286 virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar*, const IntRect&) const;
287 virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar*, const IntPoint&) const;
288 virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const;
293 virtual void repaintContentRectangle(const IntRect&, bool now = false);
294 virtual void paintContents(GraphicsContext*, const IntRect& damageRect) = 0;
296 void calculateOverhangAreasForPainting(IntRect& horizontalOverhangRect, IntRect& verticalOverhangRect);
297 virtual void paintOverhangAreas(GraphicsContext*, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect);
299 virtual void contentsResized() = 0;
300 virtual void visibleContentsResized() = 0;
302 // These functions are used to create/destroy scrollbars.
303 void setHasHorizontalScrollbar(bool);
304 void setHasVerticalScrollbar(bool);
306 IntRect scrollCornerRect() const;
307 virtual void updateScrollCorner();
308 virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect);
310 // Scroll the content by blitting the pixels.
311 virtual bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect);
312 // Scroll the content by invalidating everything.
313 virtual void scrollContentsSlowPath(const IntRect& updateRect);
315 void setScrollOrigin(const IntPoint&, bool updatePositionAtAll, bool updatePositionSynchronously);
316 IntPoint scrollOrigin() { return m_scrollOrigin; }
318 // Subclassed by FrameView to check the writing-mode of the document.
319 virtual bool isVerticalDocument() const { return true; }
320 virtual bool isFlippedDocument() const { return false; }
323 RefPtr<Scrollbar> m_horizontalScrollbar;
324 RefPtr<Scrollbar> m_verticalScrollbar;
325 ScrollbarMode m_horizontalScrollbarMode;
326 ScrollbarMode m_verticalScrollbarMode;
328 bool m_horizontalScrollbarLock;
329 bool m_verticalScrollbarLock;
331 bool m_prohibitsScrolling;
333 HashSet<RefPtr<Widget> > m_children;
335 // This bool is unused on Mac OS because we directly ask the platform widget
336 // whether it is safe to blit on scroll.
337 bool m_canBlitOnScroll;
339 IntRect m_actualVisibleContentRect;
340 IntSize m_scrollOffset; // FIXME: Would rather store this as a position, but we will wait to make this change until more code is shared.
341 IntSize m_fixedLayoutSize;
342 IntSize m_contentsSize;
344 int m_scrollbarsAvoidingResizer;
345 bool m_scrollbarsSuppressed;
347 bool m_inUpdateScrollbars;
348 unsigned m_updateScrollbarsPass;
350 IntPoint m_panScrollIconPoint;
351 bool m_drawPanScrollIcon;
352 bool m_useFixedLayout;
354 bool m_paintsEntireContents;
355 bool m_clipsRepaints;
356 bool m_delegatesScrolling;
358 // There are 8 possible combinations of writing mode and direction. Scroll origin will be non-zero in the x or y axis
359 // if there is any reversed direction or writing-mode. The combinations are:
360 // writing-mode / direction scrollOrigin.x() set scrollOrigin.y() set
361 // horizontal-tb / ltr NO NO
362 // horizontal-tb / rtl YES NO
363 // horizontal-bt / ltr NO YES
364 // horizontal-bt / rtl YES YES
365 // vertical-lr / ltr NO NO
366 // vertical-lr / rtl NO YES
367 // vertical-rl / ltr YES NO
368 // vertical-rl / rtl YES YES
369 IntPoint m_scrollOrigin;
374 // Called to update the scrollbars to accurately reflect the state of the view.
375 void updateScrollbars(const IntSize& desiredOffset);
377 // Called when the scroll position within this view changes. FrameView overrides this to generate repaint invalidations.
378 virtual void repaintFixedElementsAfterScrolling() {}
381 void platformDestroy();
382 void platformAddChild(Widget*);
383 void platformRemoveChild(Widget*);
384 void platformSetScrollbarModes();
385 void platformScrollbarModes(ScrollbarMode& horizontal, ScrollbarMode& vertical) const;
386 void platformSetCanBlitOnScroll(bool);
387 bool platformCanBlitOnScroll() const;
388 IntRect platformVisibleContentRect(bool includeScrollbars) const;
389 IntSize platformContentsSize() const;
390 void platformSetContentsSize();
391 IntRect platformContentsToScreen(const IntRect&) const;
392 IntPoint platformScreenToContents(const IntPoint&) const;
393 void platformSetScrollPosition(const IntPoint&);
394 bool platformScroll(ScrollDirection, ScrollGranularity);
395 void platformSetScrollbarsSuppressed(bool repaintOnUnsuppress);
396 void platformRepaintContentRectangle(const IntRect&, bool now);
397 bool platformIsOffscreen() const;
399 void platformSetScrollOrigin(const IntPoint&, bool updatePositionAtAll, bool updatePositionSynchronously);
401 #if PLATFORM(ANDROID)
402 int platformActualWidth() const;
403 int platformActualHeight() const;
404 int platformActualScrollX() const;
405 int platformActualScrollY() const;
408 #if PLATFORM(MAC) && defined __OBJC__
410 NSView* documentView() const;
413 NSScrollView<WebCoreFrameScrollView>* scrollView() const;
418 void setGtkAdjustments(GtkAdjustment* hadj, GtkAdjustment* vadj, bool resetValues = true);
419 void setHorizontalAdjustment(GtkAdjustment* hadj, bool resetValues = true);
420 void setVerticalAdjustment(GtkAdjustment* vadj, bool resetValues = true);
421 void setScrollOffset(const IntSize& offset) { m_scrollOffset = offset; }
424 GRefPtr<GtkAdjustment> m_horizontalAdjustment;
425 GRefPtr<GtkAdjustment> m_verticalAdjustment;
430 virtual void setPlatformWidget(wxWindow*);
431 void adjustScrollbars(int x = -1, int y = -1, bool refresh = true);
433 class ScrollViewPrivate;
434 ScrollViewPrivate* m_data;
437 #ifdef ANDROID_CAPTURE_OFFSCREEN_PAINTS
439 // capture parts of rect not contained by vis
440 void platformOffscreenContentRectangle(const IntRect& vis,
441 const IntRect& rect);
443 }; // class ScrollView
445 } // namespace WebCore
447 #endif // ScrollView_h