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 "GtkVersioning.h"
32#include "PlatformMouseEvent.h"
33#include "RenderThemeGtk.h"
34#include "ScrollView.h"
35#include "Scrollbar.h"
36#include "WidgetRenderingContext.h"
37#include <gtk/gtk.h>
38
39namespace WebCore {
40
41static void gtkStyleSetCallback(GtkWidget* widget, GtkStyle* previous, ScrollbarThemeGtk* scrollbarTheme)
42{
43    scrollbarTheme->updateThemeProperties();
44}
45
46ScrollbarThemeGtk::ScrollbarThemeGtk()
47{
48    updateThemeProperties();
49    g_signal_connect(static_cast<RenderThemeGtk*>(RenderTheme::defaultTheme().get())->gtkHScrollbar(),
50         "style-set", G_CALLBACK(gtkStyleSetCallback), this);
51}
52
53void 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
67static 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
73void 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
88void 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
97void 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
130void 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
217