1 /* 2 * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2006 Michael Emmel mike.emmel (at) gmail.com 4 * Copyright (C) 2007, 2009 Holger Hans Peter Freyther 5 * Copyright (C) 2008, 2010 Collabora Ltd. 6 * 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 25 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 26 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 #include "ScrollView.h" 33 34 #if USE(NATIVE_GTK_MAIN_FRAME_SCROLLBAR) 35 36 #include "ChromeClient.h" 37 #include "FloatRect.h" 38 #include "Frame.h" 39 #include "FrameView.h" 40 #include "GraphicsContext.h" 41 #include "GtkVersioning.h" 42 #include "HostWindow.h" 43 #include "IntRect.h" 44 #include "MainFrameScrollbarGtk.h" 45 #include "Page.h" 46 #include "PlatformMouseEvent.h" 47 #include "PlatformWheelEvent.h" 48 #include "ScrollbarTheme.h" 49 #include <gtk/gtk.h> 50 51 using namespace std; 52 53 namespace WebCore { 54 55 void ScrollView::platformInit() 56 { 57 } 58 59 void ScrollView::platformDestroy() 60 { 61 m_horizontalAdjustment = 0; 62 m_verticalAdjustment = 0; 63 } 64 65 PassRefPtr<Scrollbar> ScrollView::createScrollbar(ScrollbarOrientation orientation) 66 { 67 // If this is an interior frame scrollbar, we want to create a totally fake 68 // scrollbar with no GtkAdjustment backing it. 69 if (parent()) 70 return Scrollbar::createNativeScrollbar(this, orientation, RegularScrollbar); 71 72 // If this is the main frame, we want to create a Scrollbar that does no painting 73 // and defers to our GtkAdjustment for all of its state. Note that the GtkAdjustment 74 // may be null here. 75 if (orientation == HorizontalScrollbar) 76 return MainFrameScrollbarGtk::create(this, orientation, m_horizontalAdjustment.get()); 77 78 // VerticalScrollbar 79 return MainFrameScrollbarGtk::create(this, orientation, m_verticalAdjustment.get()); 80 } 81 82 void ScrollView::setHorizontalAdjustment(GtkAdjustment* hadj, bool resetValues) 83 { 84 ASSERT(!parent() || !hadj); 85 if (parent()) 86 return; 87 88 m_horizontalAdjustment = hadj; 89 90 if (!m_horizontalAdjustment) { 91 MainFrameScrollbarGtk* hScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(horizontalScrollbar()); 92 if (hScrollbar) 93 hScrollbar->detachAdjustment(); 94 95 return; 96 } 97 98 // We may be lacking scrollbars when returning to a cached 99 // page, this kicks the page to recreate the scrollbars. 100 setHasHorizontalScrollbar(true); 101 102 MainFrameScrollbarGtk* hScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(horizontalScrollbar()); 103 hScrollbar->attachAdjustment(m_horizontalAdjustment.get()); 104 105 // We used to reset everything to 0 here, but when page cache 106 // is enabled we reuse FrameViews that are cached. Since their 107 // size is not going to change when being restored, (which is 108 // what would cause the upper limit in the adjusments to be 109 // set in the normal case), we make sure they are up-to-date 110 // here. This is needed for the parent scrolling widget to be 111 // able to report correct values. 112 int horizontalPageStep = max(max<int>(frameRect().width() * Scrollbar::minFractionToStepWhenPaging(), frameRect().width() - Scrollbar::maxOverlapBetweenPages()), 1); 113 gtk_adjustment_configure(m_horizontalAdjustment.get(), 114 resetValues ? 0 : scrollOffset().width(), 0, 115 resetValues ? 0 : contentsSize().width(), 116 resetValues ? 0 : Scrollbar::pixelsPerLineStep(), 117 resetValues ? 0 : horizontalPageStep, 118 resetValues ? 0 : frameRect().width()); 119 } 120 121 void ScrollView::setVerticalAdjustment(GtkAdjustment* vadj, bool resetValues) 122 { 123 ASSERT(!parent() || !vadj); 124 if (parent()) 125 return; 126 127 m_verticalAdjustment = vadj; 128 129 if (!m_verticalAdjustment) { 130 MainFrameScrollbarGtk* vScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(verticalScrollbar()); 131 if (vScrollbar) 132 vScrollbar->detachAdjustment(); 133 134 return; 135 } 136 137 // We may be lacking scrollbars when returning to a cached 138 // page, this kicks the page to recreate the scrollbars. 139 setHasVerticalScrollbar(true); 140 141 MainFrameScrollbarGtk* vScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(verticalScrollbar()); 142 vScrollbar->attachAdjustment(m_verticalAdjustment.get()); 143 144 // We used to reset everything to 0 here, but when page cache 145 // is enabled we reuse FrameViews that are cached. Since their 146 // size is not going to change when being restored, (which is 147 // what would cause the upper limit in the adjusments to be 148 // set in the normal case), we make sure they are up-to-date 149 // here. This is needed for the parent scrolling widget to be 150 // able to report correct values. 151 int verticalPageStep = max(max<int>(frameRect().width() * Scrollbar::minFractionToStepWhenPaging(), frameRect().width() - Scrollbar::maxOverlapBetweenPages()), 1); 152 gtk_adjustment_configure(m_verticalAdjustment.get(), 153 resetValues ? 0 : scrollOffset().height(), 0, 154 resetValues ? 0 : contentsSize().height(), 155 resetValues ? 0 : Scrollbar::pixelsPerLineStep(), 156 resetValues ? 0 : verticalPageStep, 157 resetValues ? 0 : frameRect().height()); 158 } 159 160 void ScrollView::setGtkAdjustments(GtkAdjustment* hadj, GtkAdjustment* vadj, bool resetValues) 161 { 162 setHorizontalAdjustment(hadj, resetValues); 163 setVerticalAdjustment(vadj, resetValues); 164 } 165 166 IntRect ScrollView::visibleContentRect(bool includeScrollbars) const 167 { 168 // If we are an interior frame scrollbar or are in some sort of transition 169 // state, just calculate our size based on what the GTK+ theme says the 170 // scrollbar width should be. 171 if (parent() || !hostWindow() || !hostWindow()->platformPageClient()) { 172 return IntRect(IntPoint(m_scrollOffset.width(), m_scrollOffset.height()), 173 IntSize(max(0, m_boundsSize.width() - (verticalScrollbar() && !includeScrollbars ? verticalScrollbar()->width() : 0)), 174 max(0, m_boundsSize.height() - (horizontalScrollbar() && !includeScrollbars ? horizontalScrollbar()->height() : 0)))); 175 } 176 177 // We don't have a parent, so we are the main frame and thus have 178 // a parent widget which we can use to measure the visible region. 179 GtkWidget* measuredWidget = hostWindow()->platformPageClient(); 180 GtkWidget* parentWidget = gtk_widget_get_parent(measuredWidget); 181 182 // We may not be in a widget that displays scrollbars, but we may 183 // have other kinds of decoration that make us smaller. 184 if (parentWidget && includeScrollbars) 185 measuredWidget = parentWidget; 186 187 GtkAllocation allocation; 188 gtk_widget_get_allocation(measuredWidget, &allocation); 189 return IntRect(IntPoint(m_scrollOffset.width(), m_scrollOffset.height()), 190 IntSize(allocation.width, allocation.height)); 191 } 192 193 void ScrollView::setScrollbarModes(ScrollbarMode horizontalMode, ScrollbarMode verticalMode, bool horizontalLock, bool verticalLock) 194 { 195 // FIXME: Restructure the ScrollView abstraction so that we do not have to 196 // copy this verbatim from ScrollView.cpp. Until then, we should make sure this 197 // is kept in sync. 198 bool needsUpdate = false; 199 200 if (horizontalMode != horizontalScrollbarMode() && !m_horizontalScrollbarLock) { 201 m_horizontalScrollbarMode = horizontalMode; 202 needsUpdate = true; 203 } 204 205 if (verticalMode != verticalScrollbarMode() && !m_verticalScrollbarLock) { 206 m_verticalScrollbarMode = verticalMode; 207 needsUpdate = true; 208 } 209 210 if (horizontalLock) 211 setHorizontalScrollbarLock(); 212 213 if (verticalLock) 214 setVerticalScrollbarLock(); 215 216 if (needsUpdate) 217 updateScrollbars(scrollOffset()); 218 219 // We don't need to report policy changes on ScrollView's unless this 220 // one has an adjustment attached and it is a main frame. 221 if (!m_horizontalAdjustment || parent() || !isFrameView()) 222 return; 223 224 // For frames that do have adjustments attached, we want to report 225 // policy changes, so that they may be applied to the widget to 226 // which the WebView's container (e.g. GtkScrolledWindow). 227 if (hostWindow()) 228 hostWindow()->scrollbarsModeDidChange(); 229 } 230 231 } 232 233 #endif // USE(NATIVE_GTK_MAIN_FRAME_SCROLLBAR) 234
