1 /* 2 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2008 Collabora Ltd. All rights reserved. 4 * Copyright (C) 2013 Google Inc. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef Widget_h 29 #define Widget_h 30 31 #include "platform/PlatformExport.h" 32 #include "platform/geometry/IntRect.h" 33 #include "wtf/Forward.h" 34 #include "wtf/RefCounted.h" 35 36 namespace WebCore { 37 38 class Event; 39 class GraphicsContext; 40 class HostWindow; 41 42 // The Widget class serves as a base class for three kinds of objects: 43 // (1) Scrollable areas (ScrollView) 44 // (2) Scrollbars (Scrollbar) 45 // (3) Plugins (PluginView) 46 // 47 // Widgets are connected in a hierarchy, with the restriction that plugins and 48 // scrollbars are always leaves of the tree. Only ScrollViews can have children 49 // (and therefore the Widget class has no concept of children). 50 class PLATFORM_EXPORT Widget : public RefCounted<Widget> { 51 public: 52 Widget(); 53 virtual ~Widget(); 54 55 int x() const { return frameRect().x(); } 56 int y() const { return frameRect().y(); } 57 int width() const { return frameRect().width(); } 58 int height() const { return frameRect().height(); } 59 IntSize size() const { return frameRect().size(); } 60 IntPoint location() const { return frameRect().location(); } 61 62 virtual void setFrameRect(const IntRect& frame) { m_frame = frame; } 63 const IntRect& frameRect() const { return m_frame; } 64 IntRect boundsRect() const { return IntRect(0, 0, width(), height()); } 65 66 void resize(int w, int h) { setFrameRect(IntRect(x(), y(), w, h)); } 67 void resize(const IntSize& s) { setFrameRect(IntRect(location(), s)); } 68 void move(int x, int y) { setFrameRect(IntRect(x, y, width(), height())); } 69 void move(const IntPoint& p) { setFrameRect(IntRect(p, size())); } 70 71 virtual void paint(GraphicsContext*, const IntRect&) { } 72 void invalidate() { invalidateRect(boundsRect()); } 73 virtual void invalidateRect(const IntRect&) = 0; 74 75 virtual void setFocus(bool) { } 76 77 virtual void show() { } 78 virtual void hide() { } 79 bool isSelfVisible() const { return m_selfVisible; } // Whether or not we have been explicitly marked as visible or not. 80 bool isParentVisible() const { return m_parentVisible; } // Whether or not our parent is visible. 81 bool isVisible() const { return m_selfVisible && m_parentVisible; } // Whether or not we are actually visible. 82 virtual void setParentVisible(bool visible) { m_parentVisible = visible; } 83 void setSelfVisible(bool v) { m_selfVisible = v; } 84 85 virtual bool isFrameView() const { return false; } 86 virtual bool isPluginView() const { return false; } 87 virtual bool isPluginContainer() const { return false; } 88 virtual bool isScrollbar() const { return false; } 89 virtual bool isScrollView() const { return false; } 90 91 virtual HostWindow* hostWindow() const { ASSERT_NOT_REACHED(); return 0; } 92 virtual void setParent(Widget*); 93 Widget* parent() const { return m_parent; } 94 Widget* root() const; 95 96 virtual void handleEvent(Event*) { } 97 98 IntRect convertToRootView(const IntRect&) const; 99 IntRect convertFromRootView(const IntRect&) const; 100 101 IntPoint convertToRootView(const IntPoint&) const; 102 IntPoint convertFromRootView(const IntPoint&) const; 103 104 // It is important for cross-platform code to realize that Mac has flipped coordinates. Therefore any code 105 // that tries to convert the location of a rect using the point-based convertFromContainingWindow will end 106 // up with an inaccurate rect. Always make sure to use the rect-based convertFromContainingWindow method 107 // when converting window rects. 108 IntRect convertToContainingWindow(const IntRect&) const; 109 IntRect convertFromContainingWindow(const IntRect&) const; 110 111 IntPoint convertToContainingWindow(const IntPoint&) const; 112 IntPoint convertFromContainingWindow(const IntPoint&) const; 113 114 virtual void frameRectsChanged() { } 115 116 // Notifies this widget that other widgets on the page have been repositioned. 117 virtual void widgetPositionsUpdated() { } 118 119 // Notifies this widget that its clip rect changed. 120 virtual void clipRectChanged() { } 121 122 // Virtual methods to convert points to/from the containing ScrollView 123 virtual IntRect convertToContainingView(const IntRect&) const; 124 virtual IntRect convertFromContainingView(const IntRect&) const; 125 virtual IntPoint convertToContainingView(const IntPoint&) const; 126 virtual IntPoint convertFromContainingView(const IntPoint&) const; 127 128 // Virtual methods to convert points to/from child widgets 129 virtual IntPoint convertChildToSelf(const Widget*, const IntPoint&) const; 130 virtual IntPoint convertSelfToChild(const Widget*, const IntPoint&) const; 131 132 // Notifies this widget that it will no longer be receiving events. 133 virtual void eventListenersRemoved() { } 134 135 private: 136 Widget* m_parent; 137 IntRect m_frame; 138 bool m_selfVisible; 139 bool m_parentVisible; 140 }; 141 142 } // namespace WebCore 143 144 #endif // Widget_h 145
