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// Copyright (c) 2012 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/throbber_gtk.h"
#include "base/logging.h"
#include "chrome/browser/ui/gtk/gtk_theme_service.h"
#include "chrome/common/chrome_notification_types.h"
#include "content/public/browser/notification_source.h"
#include "grit/ui_resources.h"
#include "ui/base/animation/tween.h"
#include "ui/gfx/image/cairo_cached_surface.h"
namespace {
// The length of a single cycle of the animation in milliseconds.
const int kThrobberDurationMs = 750;
} // namespace
ThrobberGtk::ThrobberGtk(GtkThemeService* theme_service)
: theme_service_(theme_service),
ALLOW_THIS_IN_INITIALIZER_LIST(animation_(this)),
num_frames_(0) {
DCHECK(theme_service_);
Init();
}
ThrobberGtk::~ThrobberGtk() {
widget_.Destroy();
}
void ThrobberGtk::Start() {
animation_.Show();
}
void ThrobberGtk::Stop() {
animation_.Reset();
}
void ThrobberGtk::AnimationEnded(const ui::Animation* animation) {
animation_.Reset();
animation_.Show();
}
void ThrobberGtk::AnimationProgressed(const ui::Animation* animation) {
gtk_widget_queue_draw(widget_.get());
}
void ThrobberGtk::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK_EQ(chrome::NOTIFICATION_BROWSER_THEME_CHANGED, type);
LoadFrames();
gtk_widget_queue_draw(widget_.get());
}
gboolean ThrobberGtk::OnExpose(GtkWidget* widget, GdkEventExpose* expose) {
cairo_t* cairo_context =
gdk_cairo_create(GDK_DRAWABLE(gtk_widget_get_window(widget)));
GtkAllocation allocation;
gtk_widget_get_allocation(widget, &allocation);
cairo_translate(cairo_context, allocation.x, allocation.y);
gfx::CairoCachedSurface* cairo_frames = frames_.ToCairo();
const int frame =
static_cast<int>(animation_.GetCurrentValue() * (num_frames_ - 1));
const int image_size = cairo_frames->Height();
const int image_offset = frame * image_size;
cairo_frames->SetSource(cairo_context, widget, -image_offset, 0);
cairo_rectangle(cairo_context, 0, 0, image_size, image_size);
cairo_fill(cairo_context);
cairo_destroy(cairo_context);
return TRUE;
}
void ThrobberGtk::Init() {
animation_.SetSlideDuration(kThrobberDurationMs);
animation_.SetTweenType(ui::Tween::LINEAR);
widget_.Own(gtk_image_new());
gtk_widget_set_can_focus(widget_.get(), FALSE);
g_signal_connect(widget_.get(), "expose-event", G_CALLBACK(OnExposeThunk),
this);
theme_service_->InitThemesFor(this);
registrar_.Add(this, chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
content::Source<ThemeService>(theme_service_));
}
void ThrobberGtk::LoadFrames() {
frames_ = theme_service_->GetImageNamed(IDR_THROBBER);
DCHECK(!frames_.IsEmpty());
const int width = frames_.ToCairo()->Width();
const int height = frames_.ToCairo()->Height();
DCHECK_EQ(0, width % height);
num_frames_ = width / height;
gtk_widget_set_size_request(widget_.get(), height, height);
}
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