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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/gtk/gtk_chrome_button.h"
#include "base/basictypes.h"
#include "chrome/browser/ui/gtk/nine_box.h"
#include "grit/ui_resources.h"
#include "ui/gfx/gtk_util.h"
namespace {
// The theme graphics for when the mouse is over the button.
NineBox* g_nine_box_prelight;
// The theme graphics for when the button is clicked.
NineBox* g_nine_box_active;
} // namespace
G_BEGIN_DECLS
#define GTK_CHROME_BUTTON_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o),\
GTK_TYPE_CHROME_BUTTON,\
GtkChromeButtonPrivate))
typedef struct _GtkChromeButtonPrivate GtkChromeButtonPrivate;
struct _GtkChromeButtonPrivate {
int paint_state;
// If true, we use images provided by the theme instead of GTK's default
// button rendering.
gboolean use_gtk_rendering;
gdouble hover_state;
};
G_DEFINE_TYPE(GtkChromeButton, gtk_chrome_button, GTK_TYPE_BUTTON)
static gboolean gtk_chrome_button_expose(GtkWidget* widget,
GdkEventExpose* event);
static void gtk_chrome_button_class_init(GtkChromeButtonClass* button_class) {
gtk_rc_parse_string(
"style \"chrome-button\" {"
" xthickness = 2 "
" GtkButton::child-displacement-x = 0"
" GtkButton::child-displacement-y = 0"
" GtkButton::inner-border = { 0, 0, 0, 0 }"
"}"
"widget_class \"*.<GtkChromeButton>\" style \"chrome-button\"");
GtkWidgetClass* widget_class =
reinterpret_cast<GtkWidgetClass*>(button_class);
widget_class->expose_event = gtk_chrome_button_expose;
g_nine_box_prelight = new NineBox(
IDR_TEXTBUTTON_TOP_LEFT_H,
IDR_TEXTBUTTON_TOP_H,
IDR_TEXTBUTTON_TOP_RIGHT_H,
IDR_TEXTBUTTON_LEFT_H,
IDR_TEXTBUTTON_CENTER_H,
IDR_TEXTBUTTON_RIGHT_H,
IDR_TEXTBUTTON_BOTTOM_LEFT_H,
IDR_TEXTBUTTON_BOTTOM_H,
IDR_TEXTBUTTON_BOTTOM_RIGHT_H);
g_nine_box_active = new NineBox(
IDR_TEXTBUTTON_TOP_LEFT_P,
IDR_TEXTBUTTON_TOP_P,
IDR_TEXTBUTTON_TOP_RIGHT_P,
IDR_TEXTBUTTON_LEFT_P,
IDR_TEXTBUTTON_CENTER_P,
IDR_TEXTBUTTON_RIGHT_P,
IDR_TEXTBUTTON_BOTTOM_LEFT_P,
IDR_TEXTBUTTON_BOTTOM_P,
IDR_TEXTBUTTON_BOTTOM_RIGHT_P);
GObjectClass* gobject_class = G_OBJECT_CLASS(button_class);
g_type_class_add_private(gobject_class, sizeof(GtkChromeButtonPrivate));
}
static void gtk_chrome_button_init(GtkChromeButton* button) {
GtkChromeButtonPrivate* priv = GTK_CHROME_BUTTON_GET_PRIVATE(button);
priv->paint_state = -1;
priv->use_gtk_rendering = FALSE;
priv->hover_state = -1.0;
gtk_widget_set_can_focus(GTK_WIDGET(button), FALSE);
}
static gboolean gtk_chrome_button_expose(GtkWidget* widget,
GdkEventExpose* event) {
GtkChromeButtonPrivate *priv = GTK_CHROME_BUTTON_GET_PRIVATE(widget);
int paint_state = priv->paint_state < 0 ?
gtk_widget_get_state(widget) : priv->paint_state;
if (priv->use_gtk_rendering) {
// We have the superclass handle this expose when we aren't using custom
// rendering AND we're in either the prelight or active state so that we
// get the button border for the current GTK theme drawn.
if (paint_state == GTK_STATE_PRELIGHT || paint_state == GTK_STATE_ACTIVE) {
// Set the state of button->depressed so we paint pressed even if the
// actual state of the button is something else.
GTK_BUTTON(widget)->depressed = (paint_state == GTK_STATE_ACTIVE);
return GTK_WIDGET_CLASS(gtk_chrome_button_parent_class)->expose_event
(widget, event);
}
} else {
double effective_hover_state = paint_state == GTK_STATE_PRELIGHT ?
1.0 : 0.0;
// |paint_state| overrides |hover_state|.
if (priv->hover_state >= 0.0 && priv->paint_state < 0)
effective_hover_state = priv->hover_state;
if (paint_state == GTK_STATE_ACTIVE) {
g_nine_box_active->RenderToWidget(widget);
} else {
g_nine_box_prelight->RenderToWidgetWithOpacity(widget,
effective_hover_state);
}
}
// If we have a child widget, draw it.
if (gtk_bin_get_child(GTK_BIN(widget))) {
gtk_container_propagate_expose(GTK_CONTAINER(widget),
gtk_bin_get_child(GTK_BIN(widget)),
event);
}
return FALSE;
}
GtkWidget* gtk_chrome_button_new(void) {
return GTK_WIDGET(g_object_new(GTK_TYPE_CHROME_BUTTON, NULL));
}
void gtk_chrome_button_set_paint_state(GtkChromeButton* button,
GtkStateType state) {
g_return_if_fail(GTK_IS_CHROME_BUTTON(button));
GtkChromeButtonPrivate *priv = GTK_CHROME_BUTTON_GET_PRIVATE(button);
priv->paint_state = state;
gtk_widget_queue_draw(GTK_WIDGET(button));
}
void gtk_chrome_button_unset_paint_state(GtkChromeButton* button) {
g_return_if_fail(GTK_IS_CHROME_BUTTON(button));
GtkChromeButtonPrivate *priv = GTK_CHROME_BUTTON_GET_PRIVATE(button);
priv->paint_state = -1;
gtk_widget_queue_draw(GTK_WIDGET(button));
}
void gtk_chrome_button_set_use_gtk_rendering(GtkChromeButton* button,
gboolean value) {
g_return_if_fail(GTK_IS_CHROME_BUTTON(button));
GtkChromeButtonPrivate *priv = GTK_CHROME_BUTTON_GET_PRIVATE(button);
priv->use_gtk_rendering = value;
}
void gtk_chrome_button_set_hover_state(GtkChromeButton* button,
gdouble state) {
GtkChromeButtonPrivate* priv = GTK_CHROME_BUTTON_GET_PRIVATE(button);
if (state >= 0.0 && state <= 1.0)
priv->hover_state = state;
else
priv->hover_state = -1.0;
gtk_widget_queue_draw(GTK_WIDGET(button));
}
G_END_DECLS
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