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;
65 virtual void notifyPageThatContentAreaWillPaint() const;
67 // NOTE: This should only be called by the overriden setScrollOffset from ScrollableArea.
68 virtual void scrollTo(const IntSize& newOffset);
70 // The window thats hosts the ScrollView. The ScrollView will communicate scrolls and repaints to the
71 // host window in the window's coordinate space.
72 virtual HostWindow* hostWindow() const = 0;
74 // Returns a clip rect in host window coordinates. Used to clip the blit on a scroll.
75 virtual IntRect windowClipRect(bool clipToContents = true) const = 0;
77 // Functions for child manipulation and inspection.
78 const HashSet<RefPtr<Widget> >* children() const { return &m_children; }
79 void addChild(PassRefPtr<Widget>);
80 void removeChild(Widget*);
82 // If the scroll view does not use a native widget, then it will have cross-platform Scrollbars. These functions
83 // can be used to obtain those scrollbars.
84 virtual Scrollbar* horizontalScrollbar() const { return m_horizontalScrollbar.get(); }
85 virtual Scrollbar* verticalScrollbar() const { return m_verticalScrollbar.get(); }
86 bool isScrollViewScrollbar(const Widget* child) const { return horizontalScrollbar() == child || verticalScrollbar() == child; }
88 // Functions for setting and retrieving the scrolling mode in each axis (horizontal/vertical). The mode has values of
89 // AlwaysOff, AlwaysOn, and Auto. AlwaysOff means never show a scrollbar, AlwaysOn means always show a scrollbar.
90 // Auto means show a scrollbar only when one is needed.
91 // Note that for platforms with native widgets, these modes are considered advisory. In other words the underlying native
92 // widget may choose not to honor the requested modes.
93 void setScrollbarModes(ScrollbarMode horizontalMode, ScrollbarMode verticalMode, bool horizontalLock = false, bool verticalLock = false);
94 void setHorizontalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(mode, verticalScrollbarMode(), lock, verticalScrollbarLock()); }
95 void setVerticalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(horizontalScrollbarMode(), mode, horizontalScrollbarLock(), lock); };
96 void scrollbarModes(ScrollbarMode& horizontalMode, ScrollbarMode& verticalMode) const;
97 ScrollbarMode horizontalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return horizontal; }
98 ScrollbarMode verticalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return vertical; }
100 void setHorizontalScrollbarLock(bool lock = true) { m_horizontalScrollbarLock = lock; }
101 bool horizontalScrollbarLock() const { return m_horizontalScrollbarLock; }
102 void setVerticalScrollbarLock(bool lock = true) { m_verticalScrollbarLock = lock; }
103 bool verticalScrollbarLock() const { return m_verticalScrollbarLock; }
105 void setScrollingModesLock(bool lock = true) { m_horizontalScrollbarLock = m_verticalScrollbarLock = lock; }
107 virtual void setCanHaveScrollbars(bool);
108 bool canHaveScrollbars() const { return horizontalScrollbarMode() != ScrollbarAlwaysOff || verticalScrollbarMode() != ScrollbarAlwaysOff; }
110 virtual bool avoidScrollbarCreation() const { return false; }
112 // By default you only receive paint events for the area that is visible. In the case of using a
113 // tiled backing store, this function can be set, so that the view paints the entire contents.
114 bool paintsEntireContents() const { return m_paintsEntireContents; }
115 void setPaintsEntireContents(bool);
117 // By default, paint events are clipped to the visible area. If set to
118 // false, paint events are no longer clipped. paintsEntireContents() implies !clipsRepaints().
119 bool clipsRepaints() const { return m_clipsRepaints; }
120 void setClipsRepaints(bool);
122 // By default programmatic scrolling is handled by WebCore and not by the UI application.
123 // In the case of using a tiled backing store, this mode can be set, so that the scroll requests
124 // are delegated to the UI application.
125 bool delegatesScrolling() const { return m_delegatesScrolling; }
126 void setDelegatesScrolling(bool);
128 // Overridden by FrameView to create custom CSS scrollbars if applicable.
129 virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
131 // If the prohibits scrolling flag is set, then all scrolling in the view (even programmatic scrolling) is turned off.
132 void setProhibitsScrolling(bool b) { m_prohibitsScrolling = b; }
133 bool prohibitsScrolling() const { return m_prohibitsScrolling; }
135 // Whether or not a scroll view will blit visible contents when it is scrolled. Blitting is disabled in situations
136 // where it would cause rendering glitches (such as with fixed backgrounds or when the view is partially transparent).
137 void setCanBlitOnScroll(bool);
138 bool canBlitOnScroll() const;
140 // The visible content rect has a location that is the scrolled offset of the document. The width and height are the viewport width
141 // and height. By default the scrollbars themselves are excluded from this rectangle, but an optional boolean argument allows them to be
143 // In the situation the client is responsible for the scrolling (ie. with a tiled backing store) it is possible to use
144 // the actualVisibleContentRect instead, though this must be updated manually, e.g after panning ends.
145 IntRect visibleContentRect(bool includeScrollbars = false) const;
146 IntRect actualVisibleContentRect() const { return m_actualVisibleContentRect.isEmpty() ? visibleContentRect() : m_actualVisibleContentRect; }
147 void setActualVisibleContentRect(const IntRect& actualVisibleContentRect) { m_actualVisibleContentRect = actualVisibleContentRect; }
148 int visibleWidth() const { return visibleContentRect().width(); }
149 int visibleHeight() const { return visibleContentRect().height(); }
151 // Functions for getting/setting the size webkit should use to layout the contents. By default this is the same as the visible
152 // content size. Explicitly setting a layout size value will cause webkit to layout the contents using this size instead.
153 int layoutWidth() const;
154 int layoutHeight() const;
155 IntSize fixedLayoutSize() const;
156 void setFixedLayoutSize(const IntSize&);
157 bool useFixedLayout() const;
158 void setUseFixedLayout(bool enable);
160 // Functions for getting/setting the size of the document contained inside the ScrollView (as an IntSize or as individual width and height
162 IntSize contentsSize() const; // Always at least as big as the visibleWidth()/visibleHeight().
163 int contentsWidth() const { return contentsSize().width(); }
164 int contentsHeight() const { return contentsSize().height(); }
165 virtual void setContentsSize(const IntSize&);
167 #if PLATFORM(ANDROID)
168 int actualWidth() const;
169 int actualHeight() const;
170 int actualScrollX() const;
171 int actualScrollY() const;
174 // Functions for querying the current scrolled position (both as a point, a size, or as individual X and Y values).
175 IntPoint scrollPosition() const { return visibleContentRect().location(); }
176 IntSize scrollOffset() const { return visibleContentRect().location() - IntPoint(); } // Gets the scrolled position as an IntSize. Convenient for adding to other sizes.
177 IntPoint maximumScrollPosition() const; // The maximum position we can be scrolled to.
178 IntPoint minimumScrollPosition() const; // The minimum position we can be scrolled to.
179 // Adjust the passed in scroll position to keep it between the minimum and maximum positions.
180 IntPoint adjustScrollPositionWithinRange(const IntPoint&) const;
181 int scrollX() const { return scrollPosition().x(); }
182 int scrollY() const { return scrollPosition().y(); }
184 IntSize overhangAmount() const;
186 // Functions for scrolling the view.
187 void setScrollPosition(const IntPoint&);
188 void scrollBy(const IntSize& s) { return setScrollPosition(scrollPosition() + s); }
190 // This function scrolls by lines, pages or pixels.
191 bool scroll(ScrollDirection, ScrollGranularity);
193 // A logical scroll that just ends up calling the corresponding physical scroll() based off the document's writing mode.
194 bool logicalScroll(ScrollLogicalDirection, ScrollGranularity);
196 // Scroll the actual contents of the view (either blitting or invalidating as needed).
197 void scrollContents(const IntSize& scrollDelta);
199 // This gives us a means of blocking painting on our scrollbars until the first layout has occurred.
200 void setScrollbarsSuppressed(bool suppressed, bool repaintOnUnsuppress = false);
201 bool scrollbarsSuppressed() const { return m_scrollbarsSuppressed; }
203 // Event coordinates are assumed to be in the coordinate space of a window that contains
204 // the entire widget hierarchy. It is up to the platform to decide what the precise definition
205 // of containing window is. (For example on Mac it is the containing NSWindow.)
206 IntPoint windowToContents(const IntPoint&) const;
207 IntPoint contentsToWindow(const IntPoint&) const;
208 IntRect windowToContents(const IntRect&) const;
209 IntRect contentsToWindow(const IntRect&) const;
211 // Functions for converting to and from screen coordinates.
212 IntRect contentsToScreen(const IntRect&) const;
213 IntPoint screenToContents(const IntPoint&) const;
215 // 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
216 // we know that we are either not in a window right now or if that window is not visible.
217 bool isOffscreen() const;
219 // These functions are used to enable scrollbars to avoid window resizer controls that overlap the scroll view. This happens on Mac
221 virtual IntRect windowResizerRect() const { return IntRect(); }
222 bool containsScrollbarsAvoidingResizer() const;
223 void adjustScrollbarsAvoidingResizerCount(int overlapDelta);
224 void windowResizerRectChanged();
226 virtual void setParent(ScrollView*); // Overridden to update the overlapping scrollbar count.
228 // Called when our frame rect changes (or the rect/scroll position of an ancestor changes).
229 virtual void frameRectsChanged();
231 // Widget override to update our scrollbars and notify our contents of the resize.
232 virtual void setFrameRect(const IntRect&);
233 virtual void setBoundsSize(const IntSize&);
235 // For platforms that need to hit test scrollbars from within the engine's event handlers (like Win32).
236 Scrollbar* scrollbarAtPoint(const IntPoint& windowPoint);
238 // This function exists for scrollviews that need to handle wheel events manually.
239 // On Mac the underlying NSScrollView just does the scrolling, but on other platforms
240 // (like Windows), we need this function in order to do the scroll ourselves.
241 void wheelEvent(PlatformWheelEvent&);
242 #if ENABLE(GESTURE_EVENTS)
243 void gestureEvent(const PlatformGestureEvent&);
246 IntPoint convertChildToSelf(const Widget* child, const IntPoint& point) const
248 IntPoint newPoint = point;
249 if (!isScrollViewScrollbar(child))
250 newPoint = point - scrollOffset();
251 newPoint.move(child->x(), child->y());
255 IntPoint convertSelfToChild(const Widget* child, const IntPoint& point) const
257 IntPoint newPoint = point;
258 if (!isScrollViewScrollbar(child))
259 newPoint = point + scrollOffset();
260 newPoint.move(-child->x(), -child->y());
264 // Widget override. Handles painting of the contents of the view as well as the scrollbars.
265 virtual void paint(GraphicsContext*, const IntRect&);
266 void paintScrollbars(GraphicsContext*, const IntRect&);
268 // Widget overrides to ensure that our children's visibility status is kept up to date when we get shown and hidden.
271 virtual void setParentVisible(bool);
274 static const int noPanScrollRadius = 15;
275 void addPanScrollIcon(const IntPoint&);
276 void removePanScrollIcon();
277 void paintPanScrollIcon(GraphicsContext*);
279 virtual bool isPointInScrollbarCorner(const IntPoint&);
280 virtual bool scrollbarCornerPresent() const;
282 virtual IntRect convertFromScrollbarToContainingView(const Scrollbar*, const IntRect&) const;
283 virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar*, const IntRect&) const;
284 virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar*, const IntPoint&) const;
285 virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const;
290 virtual void repaintContentRectangle(const IntRect&, bool now = false);
291 virtual void paintContents(GraphicsContext*, const IntRect& damageRect) = 0;
293 void calculateOverhangAreasForPainting(IntRect& horizontalOverhangRect, IntRect& verticalOverhangRect);
294 virtual void paintOverhangAreas(GraphicsContext*, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect);
296 virtual void contentsResized() = 0;
297 virtual void visibleContentsResized() = 0;
299 IntSize boundsSize() const { return m_boundsSize; }
300 void setInitialBoundsSize(const IntSize&);
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 IntSize m_boundsSize;
363 // Called to update the scrollbars to accurately reflect the state of the view.
364 void updateScrollbars(const IntSize& desiredOffset);
366 // Called when the scroll position within this view changes. FrameView overrides this to generate repaint invalidations.
367 virtual void repaintFixedElementsAfterScrolling() {}
370 void platformDestroy();
371 void platformAddChild(Widget*);
372 void platformRemoveChild(Widget*);
373 void platformSetScrollbarModes();
374 void platformScrollbarModes(ScrollbarMode& horizontal, ScrollbarMode& vertical) const;
375 void platformSetCanBlitOnScroll(bool);
376 bool platformCanBlitOnScroll() const;
377 IntRect platformVisibleContentRect(bool includeScrollbars) const;
378 IntSize platformContentsSize() const;
379 void platformSetContentsSize();
380 IntRect platformContentsToScreen(const IntRect&) const;
381 IntPoint platformScreenToContents(const IntPoint&) const;
382 void platformSetScrollPosition(const IntPoint&);
383 bool platformScroll(ScrollDirection, ScrollGranularity);
384 void platformSetScrollbarsSuppressed(bool repaintOnUnsuppress);
385 void platformRepaintContentRectangle(const IntRect&, bool now);
386 bool platformIsOffscreen() const;
388 void platformSetScrollOrigin(const IntPoint&, bool updatePositionAtAll, bool updatePositionSynchronously);
390 #if PLATFORM(ANDROID)
391 int platformActualWidth() const;
392 int platformActualHeight() const;
393 int platformActualScrollX() const;
394 int platformActualScrollY() const;
397 #if PLATFORM(MAC) && defined __OBJC__
399 NSView* documentView() const;
402 NSScrollView<WebCoreFrameScrollView>* scrollView() const;
407 void setGtkAdjustments(GtkAdjustment* hadj, GtkAdjustment* vadj, bool resetValues = true);
408 void setHorizontalAdjustment(GtkAdjustment* hadj, bool resetValues = true);
409 void setVerticalAdjustment(GtkAdjustment* vadj, bool resetValues = true);
410 void setScrollOffset(const IntSize& offset) { m_scrollOffset = offset; }
413 GRefPtr<GtkAdjustment> m_horizontalAdjustment;
414 GRefPtr<GtkAdjustment> m_verticalAdjustment;
419 virtual void setPlatformWidget(wxWindow*);
420 void adjustScrollbars(int x = -1, int y = -1, bool refresh = true);
422 class ScrollViewPrivate;
423 ScrollViewPrivate* m_data;
426 #ifdef ANDROID_CAPTURE_OFFSCREEN_PAINTS
428 // capture parts of rect not contained by vis
429 void platformOffscreenContentRectangle(const IntRect& vis,
430 const IntRect& rect);
432 }; // class ScrollView
434 } // namespace WebCore
436 #endif // ScrollView_h