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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/views/tabs/dragged_tab_view.h"
#include "base/stl_util.h"
#include "chrome/browser/ui/views/tabs/native_view_photobooth.h"
#include "third_party/skia/include/core/SkShader.h"
#include "ui/gfx/canvas.h"
#include "ui/views/widget/widget.h"
#if defined(USE_AURA)
#include "ui/views/widget/native_widget_aura.h"
#elif defined(OS_WIN)
#include "ui/gfx/win/dpi.h"
#include "ui/views/widget/native_widget_win.h"
#endif
static const int kTransparentAlpha = 200;
static const int kOpaqueAlpha = 255;
static const int kDragFrameBorderSize = 2;
static const int kTwiceDragFrameBorderSize = 2 * kDragFrameBorderSize;
static const float kScalingFactor = 0.5;
static const SkColor kDraggedTabBorderColor = SkColorSetRGB(103, 129, 162);
////////////////////////////////////////////////////////////////////////////////
// DraggedTabView, public:
DraggedTabView::DraggedTabView(const std::vector<views::View*>& renderers,
const std::vector<gfx::Rect>& renderer_bounds,
const gfx::Point& mouse_tab_offset,
const gfx::Size& contents_size,
NativeViewPhotobooth* photobooth)
: renderers_(renderers),
renderer_bounds_(renderer_bounds),
show_contents_on_drag_(true),
mouse_tab_offset_(mouse_tab_offset),
photobooth_(photobooth),
contents_size_(contents_size) {
set_owned_by_client();
container_.reset(new views::Widget);
views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
params.keep_on_top = true;
params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
params.bounds = gfx::Rect(PreferredContainerSize());
container_->Init(params);
container_->SetContentsView(this);
#if defined(OS_WIN) && !defined(USE_AURA)
static_cast<views::NativeWidgetWin*>(container_->native_widget())->
SetCanUpdateLayeredWindow(false);
BOOL drag;
if ((::SystemParametersInfo(SPI_GETDRAGFULLWINDOWS, 0, &drag, 0) != 0) &&
(drag == FALSE)) {
show_contents_on_drag_ = false;
}
#endif
container_->SetOpacity(kTransparentAlpha);
container_->SetBounds(gfx::Rect(params.bounds.size()));
}
DraggedTabView::~DraggedTabView() {
parent()->RemoveChildView(this);
container_->CloseNow();
STLDeleteElements(&renderers_);
}
void DraggedTabView::MoveTo(const gfx::Point& screen_point) {
int x;
if (base::i18n::IsRTL()) {
// On RTL locales, a dragged tab (when it is not attached to a tab strip)
// is rendered using a right-to-left orientation so we should calculate the
// window position differently.
gfx::Size ps = GetPreferredSize();
x = screen_point.x() + ScaleValue(mouse_tab_offset_.x() - ps.width());
} else {
x = screen_point.x() - ScaleValue(mouse_tab_offset_.x());
}
int y = screen_point.y() - ScaleValue(mouse_tab_offset_.y());
#if defined(OS_WIN) && !defined(USE_AURA)
double scale = gfx::win::GetDeviceScaleFactor();
x = static_cast<int>(scale * screen_point.x());
y = static_cast<int>(scale * screen_point.y());
// TODO(beng): make this cross-platform
int show_flags = container_->IsVisible() ? SWP_NOZORDER : SWP_SHOWWINDOW;
SetWindowPos(container_->GetNativeView(), HWND_TOP, x, y, 0, 0,
SWP_NOSIZE | SWP_NOACTIVATE | show_flags);
#else
gfx::Rect bounds = container_->GetWindowBoundsInScreen();
container_->SetBounds(gfx::Rect(x, y, bounds.width(), bounds.height()));
if (!container_->IsVisible())
container_->Show();
#endif
}
void DraggedTabView::Update() {
SchedulePaint();
}
///////////////////////////////////////////////////////////////////////////////
// DraggedTabView, views::View overrides:
void DraggedTabView::OnPaint(gfx::Canvas* canvas) {
if (show_contents_on_drag_)
PaintDetachedView(canvas);
else
PaintFocusRect(canvas);
}
void DraggedTabView::Layout() {
int max_width = GetPreferredSize().width();
for (size_t i = 0; i < renderers_.size(); ++i) {
gfx::Rect bounds = renderer_bounds_[i];
bounds.set_y(0);
if (base::i18n::IsRTL())
bounds.set_x(max_width - bounds.x() - bounds.width());
renderers_[i]->SetBoundsRect(bounds);
}
}
gfx::Size DraggedTabView::GetPreferredSize() {
DCHECK(!renderer_bounds_.empty());
int max_renderer_x = renderer_bounds_.back().right();
int width = std::max(max_renderer_x, contents_size_.width()) +
kTwiceDragFrameBorderSize;
int height = renderer_bounds_.back().height() + kDragFrameBorderSize +
contents_size_.height();
return gfx::Size(width, height);
}
////////////////////////////////////////////////////////////////////////////////
// DraggedTabView, private:
void DraggedTabView::PaintDetachedView(gfx::Canvas* canvas) {
gfx::Size ps = GetPreferredSize();
// TODO(pkotwicz): DIP enable this class.
gfx::Canvas scale_canvas(ps, ui::SCALE_FACTOR_100P, false);
SkBitmap& bitmap_device = const_cast<SkBitmap&>(
skia::GetTopDevice(*scale_canvas.sk_canvas())->accessBitmap(true));
bitmap_device.eraseARGB(0, 0, 0, 0);
int tab_height = renderer_bounds_.back().height();
scale_canvas.FillRect(gfx::Rect(0, tab_height - kDragFrameBorderSize,
ps.width(), ps.height() - tab_height),
kDraggedTabBorderColor);
gfx::Rect image_rect(kDragFrameBorderSize,
tab_height,
ps.width() - kTwiceDragFrameBorderSize,
contents_size_.height());
scale_canvas.FillRect(image_rect, SK_ColorBLACK);
photobooth_->PaintScreenshotIntoCanvas(&scale_canvas, image_rect);
for (size_t i = 0; i < renderers_.size(); ++i)
renderers_[i]->Paint(&scale_canvas);
SkBitmap mipmap = scale_canvas.ExtractImageRep().sk_bitmap();
mipmap.buildMipMap(true);
skia::RefPtr<SkShader> bitmap_shader = skia::AdoptRef(
SkShader::CreateBitmapShader(mipmap, SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode));
SkMatrix shader_scale;
shader_scale.setScale(kScalingFactor, kScalingFactor);
bitmap_shader->setLocalMatrix(shader_scale);
SkPaint paint;
paint.setShader(bitmap_shader.get());
paint.setAntiAlias(true);
canvas->DrawRect(gfx::Rect(ps), paint);
}
void DraggedTabView::PaintFocusRect(gfx::Canvas* canvas) {
gfx::Size ps = GetPreferredSize();
canvas->DrawFocusRect(
gfx::Rect(0, 0,
static_cast<int>(ps.width() * kScalingFactor),
static_cast<int>(ps.height() * kScalingFactor)));
}
gfx::Size DraggedTabView::PreferredContainerSize() {
gfx::Size ps = GetPreferredSize();
return gfx::Size(ScaleValue(ps.width()), ScaleValue(ps.height()));
}
int DraggedTabView::ScaleValue(int value) {
return static_cast<int>(value * kScalingFactor);
}
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