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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/tabs/dragged_tab_gtk.h"
#include <gdk/gdk.h>
#include "app/gfx/canvas.h"
#include "base/gfx/gtk_util.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/browser/tabs/tab_strip_model.h"
#include "chrome/browser/gtk/tabs/tab_renderer_gtk.h"
#include "third_party/skia/include/core/SkShader.h"
namespace {
// The size of the dragged window frame.
const int kDragFrameBorderSize = 2;
const int kTwiceDragFrameBorderSize = 2 * kDragFrameBorderSize;
// Used to scale the dragged window sizes.
const float kScalingFactor = 0.5;
const int kAnimateToBoundsDurationMs = 150;
bool IsScreenComposited() {
GdkScreen* screen = gdk_screen_get_default();
return gdk_screen_is_composited(screen) == TRUE;
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
// DraggedTabGtk, public:
DraggedTabGtk::DraggedTabGtk(TabContents* datasource,
const gfx::Point& mouse_tab_offset,
const gfx::Size& contents_size)
: renderer_(new TabRendererGtk),
attached_(false),
mouse_tab_offset_(mouse_tab_offset),
attached_tab_size_(TabRendererGtk::GetMinimumSelectedSize()),
contents_size_(contents_size),
close_animation_(this) {
renderer_->UpdateData(datasource, false);
container_ = gtk_window_new(GTK_WINDOW_POPUP);
SetContainerColorMap();
gtk_widget_set_app_paintable(container_, TRUE);
g_signal_connect(G_OBJECT(container_), "expose-event",
G_CALLBACK(OnExposeEvent), this);
gtk_widget_add_events(container_, GDK_STRUCTURE_MASK);
gtk_container_add(GTK_CONTAINER(container_), renderer_->widget());
gtk_widget_show_all(container_);
}
DraggedTabGtk::~DraggedTabGtk() {
gtk_widget_destroy(container_);
}
void DraggedTabGtk::MoveTo(const gfx::Point& screen_point) {
int x = screen_point.x() + mouse_tab_offset_.x() -
ScaleValue(mouse_tab_offset_.x());
int y = screen_point.y() + mouse_tab_offset_.y() -
ScaleValue(mouse_tab_offset_.y());
gtk_window_move(GTK_WINDOW(container_), x, y);
}
void DraggedTabGtk::Attach(int selected_width) {
attached_ = true;
attached_tab_size_.set_width(selected_width);
ResizeContainer();
Update();
}
void DraggedTabGtk::Detach() {
attached_ = false;
}
void DraggedTabGtk::Update() {
gtk_widget_queue_draw(container_);
}
void DraggedTabGtk::AnimateToBounds(const gfx::Rect& bounds,
AnimateToBoundsCallback* callback) {
animation_callback_.reset(callback);
gint x, y, width, height;
gdk_window_get_origin(container_->window, &x, &y);
gdk_window_get_geometry(container_->window, NULL, NULL,
&width, &height, NULL);
animation_start_bounds_ = gfx::Rect(x, y, width, height);
animation_end_bounds_ = bounds;
close_animation_.SetSlideDuration(kAnimateToBoundsDurationMs);
close_animation_.SetTweenType(SlideAnimation::EASE_OUT);
if (!close_animation_.IsShowing()) {
close_animation_.Reset();
close_animation_.Show();
}
}
////////////////////////////////////////////////////////////////////////////////
// DraggedTabGtk, AnimationDelegate implementation:
void DraggedTabGtk::AnimationProgressed(const Animation* animation) {
int delta_x = (animation_end_bounds_.x() - animation_start_bounds_.x());
int x = animation_start_bounds_.x() +
static_cast<int>(delta_x * animation->GetCurrentValue());
int y = animation_end_bounds_.y();
gdk_window_move(container_->window, x, y);
}
void DraggedTabGtk::AnimationEnded(const Animation* animation) {
animation_callback_->Run();
}
void DraggedTabGtk::AnimationCanceled(const Animation* animation) {
AnimationEnded(animation);
}
////////////////////////////////////////////////////////////////////////////////
// DraggedTabGtk, private:
gfx::Size DraggedTabGtk::GetPreferredSize() {
if (attached_)
return attached_tab_size_;
int width = std::max(attached_tab_size_.width(), contents_size_.width()) +
kTwiceDragFrameBorderSize;
int height = attached_tab_size_.height() + kDragFrameBorderSize +
contents_size_.height();
return gfx::Size(width, height);
}
void DraggedTabGtk::ResizeContainer() {
gfx::Size size = GetPreferredSize();
gtk_window_resize(GTK_WINDOW(container_),
ScaleValue(size.width()), ScaleValue(size.height()));
gfx::Rect bounds = renderer_->bounds();
bounds.set_width(ScaleValue(size.width()));
bounds.set_height(ScaleValue(size.height()));
renderer_->SetBounds(bounds);
Update();
}
int DraggedTabGtk::ScaleValue(int value) {
return attached_ ? value : static_cast<int>(value * kScalingFactor);
}
gfx::Rect DraggedTabGtk::bounds() const {
gint x, y, width, height;
gtk_window_get_position(GTK_WINDOW(container_), &x, &y);
gtk_window_get_size(GTK_WINDOW(container_), &width, &height);
return gfx::Rect(x, y, width, height);
}
void DraggedTabGtk::SetContainerColorMap() {
GdkScreen* screen = gtk_widget_get_screen(container_);
GdkColormap* colormap = gdk_screen_get_rgba_colormap(screen);
// If rgba is not available, use rgb instead.
if (!colormap)
colormap = gdk_screen_get_rgb_colormap(screen);
gtk_widget_set_colormap(container_, colormap);
}
void DraggedTabGtk::SetContainerTransparency() {
cairo_t* cairo_context = gdk_cairo_create(container_->window);
if (!cairo_context)
return;
// Make the background of the dragged tab window fully transparent. All of
// the content of the window (child widgets) will be completely opaque.
gfx::Size size = bounds().size();
cairo_scale(cairo_context, static_cast<double>(size.width()),
static_cast<double>(size.height()));
cairo_set_source_rgba(cairo_context, 1.0f, 1.0f, 1.0f, 0.0f);
cairo_set_operator(cairo_context, CAIRO_OPERATOR_SOURCE);
cairo_paint(cairo_context);
cairo_destroy(cairo_context);
}
void DraggedTabGtk::SetContainerShapeMask() {
// Render the tab as a bitmap.
SkBitmap tab = renderer_->PaintBitmap();
GdkPixbuf* pixbuf = gfx::GdkPixbufFromSkBitmap(&tab);
// Create a 1bpp bitmap the size of |container_|.
gfx::Size size = bounds().size();
GdkPixmap* pixmap = gdk_pixmap_new(NULL, size.width(), size.height(), 1);
cairo_t* cairo_context = gdk_cairo_create(GDK_DRAWABLE(pixmap));
// Set the transparency.
cairo_set_source_rgba(cairo_context, 1, 1, 1, 0);
// Blit the rendered bitmap into a pixmap. Any pixel set in the pixmap will
// be opaque in the container window.
cairo_set_operator(cairo_context, CAIRO_OPERATOR_SOURCE);
gdk_cairo_set_source_pixbuf(cairo_context, pixbuf, 0, 0);
cairo_paint(cairo_context);
cairo_destroy(cairo_context);
// Set the shape mask.
gdk_window_shape_combine_mask(container_->window, pixmap, 0, 0);
g_object_unref(pixbuf);
g_object_unref(pixmap);
}
// static
gboolean DraggedTabGtk::OnExposeEvent(GtkWidget* widget,
GdkEventExpose* event,
DraggedTabGtk* dragged_tab) {
if (IsScreenComposited()) {
dragged_tab->SetContainerTransparency();
} else {
dragged_tab->SetContainerShapeMask();
}
return FALSE;
}
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