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// Copyright (c) 2009 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/gtk/link_button_gtk.h"
static const char* kLinkMarkup = "<u><span color=\"%s\">%s</span></u>";
namespace {
// Set the GTK style on our custom link button. We don't want any border around
// the link text.
void SetLinkButtonStyle() {
static bool style_was_set = false;
if (style_was_set)
return;
style_was_set = true;
gtk_rc_parse_string(
"style \"chrome-link-button\" {"
" GtkButton::inner-border = {0, 0, 0, 0}"
" xthickness = 0"
" ythickness = 0"
"}"
"widget \"*chrome-link-button\" style \"chrome-link-button\"");
}
} // namespace
LinkButtonGtk::LinkButtonGtk(const char* text)
: hand_cursor_(gdk_cursor_new(GDK_HAND2)),
is_blue_(true) {
SetLinkButtonStyle();
// We put a label in a button so we can connect to the click event. We don't
// let the button draw itself; catch all expose events to the button and pass
// them through to the label.
label_ = gtk_label_new(NULL);
blue_markup = g_markup_printf_escaped(kLinkMarkup, "blue", text);
red_markup = g_markup_printf_escaped(kLinkMarkup, "red", text);
gtk_label_set_markup(GTK_LABEL(label_), blue_markup);
widget_.Own(gtk_button_new());
gtk_container_add(GTK_CONTAINER(widget_.get()), label_);
gtk_widget_set_name(widget_.get(), "chrome-link-button");
gtk_widget_set_app_paintable(widget_.get(), TRUE);
g_signal_connect(widget_.get(), "expose-event",
G_CALLBACK(OnExpose), this);
// We connect to these signals so we can set the cursor appropriately. We
// could give the link button its own GdkWindow (e.g. by placing it in a
// GtkEventBox), but that would wreak havok with painting of the parent
// widget. We can't use the enter- and leave- notify events as they operate
// on the widget's GdkWindow, and |label| nor |button| has its own GdkWindow.
g_signal_connect(widget_.get(), "enter",
G_CALLBACK(OnEnter), this);
g_signal_connect(widget_.get(), "leave",
G_CALLBACK(OnLeave), this);
}
LinkButtonGtk::~LinkButtonGtk() {
g_free(red_markup);
g_free(blue_markup);
gdk_cursor_unref(hand_cursor_);
widget_.Destroy();
}
// static
gboolean LinkButtonGtk::OnEnter(GtkWidget* widget,
LinkButtonGtk* link_button) {
gdk_window_set_cursor(widget->window, link_button->hand_cursor_);
return FALSE;
}
// static
gboolean LinkButtonGtk::OnLeave(GtkWidget* widget,
LinkButtonGtk* link_button) {
gdk_window_set_cursor(widget->window, NULL);
return FALSE;
}
// static
gboolean LinkButtonGtk::OnExpose(GtkWidget* widget,
GdkEventExpose* event,
LinkButtonGtk* link_button) {
if (GTK_WIDGET_STATE(widget) == GTK_STATE_ACTIVE && link_button->is_blue_) {
gtk_label_set_markup(GTK_LABEL(link_button->label_),
link_button->red_markup);
link_button->is_blue_ = false;
} else if (GTK_WIDGET_STATE(widget) != GTK_STATE_ACTIVE &&
!link_button->is_blue_) {
gtk_label_set_markup(GTK_LABEL(link_button->label_),
link_button->blue_markup);
link_button->is_blue_ = true;
}
// Draw the link inside the button.
gtk_container_propagate_expose(GTK_CONTAINER(widget),
gtk_bin_get_child(GTK_BIN(widget)),
event);
// Don't let the button draw itself, ever.
return TRUE;
}
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