7a0cdcdbfbec707ecc54a91ebb274205aa1461f7
[WebKit-https.git] / Source / WebCore / platform / gtk / ScrollbarThemeGtk2.cpp
1 /*
2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
24  */
25
26 #include "config.h"
27 #include "ScrollbarThemeGtk.h"
28
29 #ifdef GTK_API_VERSION_2
30
31 #include "PlatformMouseEvent.h"
32 #include "RenderThemeGtk.h"
33 #include "ScrollView.h"
34 #include "Scrollbar.h"
35 #include "WidgetRenderingContext.h"
36 #include "gtkdrawing.h"
37 #include <gtk/gtk.h>
38
39 namespace WebCore {
40
41 static void gtkStyleSetCallback(GtkWidget* widget, GtkStyle* previous, ScrollbarThemeGtk* scrollbarTheme)
42 {
43     scrollbarTheme->updateThemeProperties();
44 }
45
46 ScrollbarThemeGtk::ScrollbarThemeGtk()
47 {
48     updateThemeProperties();
49     g_signal_connect(static_cast<RenderThemeGtk*>(RenderTheme::defaultTheme().get())->gtkHScrollbar(),
50          "style-set", G_CALLBACK(gtkStyleSetCallback), this);
51 }
52
53 void ScrollbarThemeGtk::updateThemeProperties()
54 {
55     GtkWidget* scrollbar = static_cast<RenderThemeGtk*>(RenderTheme::defaultTheme().get())->gtkHScrollbar();
56     gtk_widget_style_get(scrollbar,
57                          "slider_width", &m_thumbFatness,
58                          "trough_border", &m_troughBorderWidth,
59                          "stepper-size", &m_stepperSize,
60                          "trough-under-steppers", &m_troughUnderSteppers,
61                          "has-secondary-forward-stepper", &m_hasForwardButtonStartPart,
62                          "has-secondary-backward-stepper", &m_hasBackButtonEndPart, NULL);
63     m_minThumbLength = gtk_range_get_min_slider_size(GTK_RANGE(scrollbar));
64     updateScrollbarsFrameThickness();
65 }
66
67 static GtkWidget* getWidgetForScrollbar(Scrollbar* scrollbar)
68 {
69     RenderThemeGtk* theme = static_cast<RenderThemeGtk*>(RenderTheme::defaultTheme().get());
70     return scrollbar->orientation() == VerticalScrollbar ? theme->gtkVScrollbar() : theme->gtkHScrollbar();
71 }
72
73 void ScrollbarThemeGtk::paintTrackBackground(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
74 {
75     // Paint the track background. If the trough-under-steppers property is true, this
76     // should be the full size of the scrollbar, but if is false, it should only be the
77     // track rect.
78     IntRect fullScrollbarRect(rect);
79     if (m_troughUnderSteppers)
80         fullScrollbarRect = IntRect(scrollbar->x(), scrollbar->y(), scrollbar->width(), scrollbar->height());
81
82     WidgetRenderingContext widgetContext(context, fullScrollbarRect);
83     IntRect paintRect(IntPoint(), fullScrollbarRect.size());
84     widgetContext.gtkPaintBox(paintRect, getWidgetForScrollbar(scrollbar),
85                               GTK_STATE_ACTIVE, GTK_SHADOW_IN, "trough");
86 }
87
88 void ScrollbarThemeGtk::paintScrollbarBackground(GraphicsContext* context, Scrollbar* scrollbar)
89 {
90     IntRect fullScrollbarRect = IntRect(scrollbar->x(), scrollbar->y(), scrollbar->width(), scrollbar->height());
91
92     WidgetRenderingContext widgetContext(context, fullScrollbarRect);
93     widgetContext.gtkPaintBox(fullScrollbarRect, getWidgetForScrollbar(scrollbar),
94                               GTK_STATE_NORMAL, GTK_SHADOW_IN, "scrolled_window");
95 }
96
97 void ScrollbarThemeGtk::paintThumb(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
98 {
99     GtkWidget* widget = getWidgetForScrollbar(scrollbar);
100     gboolean activateSlider;
101     gtk_widget_style_get(widget, "activate-slider", &activateSlider, NULL);
102
103     GtkStateType stateType = GTK_STATE_NORMAL;
104     GtkShadowType shadowType = GTK_SHADOW_OUT;
105     if (activateSlider && scrollbar->pressedPart() == ThumbPart) {
106         stateType = GTK_STATE_ACTIVE;
107         shadowType = GTK_SHADOW_IN;
108     } else if (scrollbar->pressedPart() == ThumbPart || scrollbar->hoveredPart() == ThumbPart)
109         stateType = GTK_STATE_PRELIGHT;
110
111     // The adjustment controls the rendering of the scrollbar thumb. If it's not set
112     // properly the theme may not draw the thumb borders properly.
113     GtkAdjustment* adjustment = gtk_range_get_adjustment(GTK_RANGE(widget));
114     gtk_adjustment_set_value(adjustment, scrollbar->currentPos());
115     gtk_adjustment_set_lower(adjustment, 0);
116     gtk_adjustment_set_upper(adjustment, scrollbar->maximum());
117
118     GtkOrientation orientation = GTK_ORIENTATION_HORIZONTAL;
119     if (scrollbar->orientation() == VerticalScrollbar) {
120         gtk_adjustment_set_page_size(adjustment, rect.height());
121         orientation = GTK_ORIENTATION_VERTICAL;
122     } else
123         gtk_adjustment_set_page_size(adjustment, rect.width());
124
125     WidgetRenderingContext widgetContext(context, rect);
126     IntRect sliderRect(IntPoint(), rect.size());
127     widgetContext.gtkPaintSlider(sliderRect, widget, stateType, shadowType, "slider", orientation);
128 }
129
130 void ScrollbarThemeGtk::paintButton(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart part)
131 {
132     // The buttons will be disabled if the thumb is as the appropriate extreme.
133     GtkShadowType shadowType = GTK_SHADOW_OUT;
134     GtkStateType stateType = GTK_STATE_INSENSITIVE;
135     bool pressed = (part == scrollbar->pressedPart());
136
137     if ((BackButtonStartPart == part && scrollbar->currentPos())
138         || (BackButtonEndPart == part && scrollbar->currentPos())
139         || (ForwardButtonEndPart == part && scrollbar->currentPos() != scrollbar->maximum())
140         || (ForwardButtonStartPart == part && scrollbar->currentPos() != scrollbar->maximum())) {
141         stateType = GTK_STATE_NORMAL;
142         if (pressed) {
143             stateType = GTK_STATE_ACTIVE;
144             shadowType = GTK_SHADOW_IN;
145         } else if (part == scrollbar->hoveredPart())
146             stateType = GTK_STATE_PRELIGHT;
147     }
148
149     // Themes determine how to draw the button (which button to draw) based on the allocation
150     // of the widget. Where the target rect is in relation to the total widget allocation
151     // determines the button.
152     ScrollbarOrientation orientation = scrollbar->orientation();
153     int buttonSize = (orientation == VerticalScrollbar) ? rect.height() : rect.width();
154     int totalAllocation = buttonSize * 5; // One space for each button and one extra.
155     int buttonOffset = 0;
156     if (ForwardButtonStartPart == part)
157         buttonOffset = buttonSize;
158     else if (BackButtonEndPart == part)
159         buttonOffset = 3 * buttonSize;
160     else if (ForwardButtonEndPart == part)
161         buttonOffset = 4 * buttonSize;
162
163     // Now we want the allocation to be relative to the origin of the painted rect.
164     GtkWidget* widget = getWidgetForScrollbar(scrollbar);
165     GtkAllocation allocation;
166     gtk_widget_get_allocation(widget, &allocation);
167     allocation.x = allocation.y = 0;
168     allocation.width = rect.width();
169     allocation.height = rect.height();
170
171     if (orientation == VerticalScrollbar) {
172         allocation.height = totalAllocation;
173         allocation.y -= buttonOffset;
174     } else {
175         allocation.width = totalAllocation;
176         allocation.x -= buttonOffset;
177     }
178     gtk_widget_set_allocation(widget, &allocation);
179
180     const char* detail = orientation == VerticalScrollbar ? "vscrollbar" : "hscrollbar";
181     WidgetRenderingContext widgetContext(context, rect);
182
183     IntRect buttonRect(IntPoint(), rect.size());
184     widgetContext.gtkPaintBox(buttonRect, widget, stateType, shadowType, detail);
185
186     float arrowScaling;
187     gtk_widget_style_get(widget, "arrow-scaling", &arrowScaling, NULL);
188     IntSize arrowSize = rect.size();
189     arrowSize.scale(arrowScaling);
190     IntRect arrowRect(IntPoint(buttonRect.x() + (buttonRect.width() - arrowSize.width()) / 2,
191                                buttonRect.y() + (buttonRect.height() - arrowSize.height()) / 2),
192                       arrowSize);
193     if (pressed) {
194         int arrowDisplacementX, arrowDisplacementY;
195         gtk_widget_style_get(widget,
196                              "arrow-displacement-x", &arrowDisplacementX,
197                              "arrow-displacement-y", &arrowDisplacementY,
198                              NULL);
199         arrowRect.move(arrowDisplacementX, arrowDisplacementY);
200     }
201
202     GtkArrowType arrowType = GTK_ARROW_DOWN;
203     if (orientation == VerticalScrollbar) {
204         if (part == BackButtonEndPart || part == BackButtonStartPart)
205             arrowType = GTK_ARROW_UP;
206     } else if (orientation == HorizontalScrollbar) {
207         arrowType = GTK_ARROW_RIGHT;
208         if (part == BackButtonEndPart || part == BackButtonStartPart)
209             arrowType = GTK_ARROW_LEFT;
210     }
211     widgetContext.gtkPaintArrow(arrowRect, widget, stateType, shadowType, arrowType, detail);
212 }
213
214 } // namespace WebCore
215
216 #endif // GTK_API_VERSION_2