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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 "ash/wm/partial_screenshot_view.h"
#include <algorithm>
#include "ash/display/mouse_cursor_event_filter.h"
#include "ash/screenshot_delegate.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/overlay_event_filter.h"
#include "ui/aura/client/capture_client.h"
#include "ui/aura/root_window.h"
#include "ui/base/cursor/cursor.h"
#include "ui/events/event.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/rect.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_observer.h"
namespace ash {
// A self-owned object to handle the cancel and the finish of current partial
// screenshot session.
class PartialScreenshotView::OverlayDelegate
: public internal::OverlayEventFilter::Delegate,
public views::WidgetObserver {
public:
OverlayDelegate() {
Shell::GetInstance()->overlay_filter()->Activate(this);
}
void RegisterWidget(views::Widget* widget) {
widgets_.push_back(widget);
widget->AddObserver(this);
}
// Overridden from OverlayEventFilter::Delegate:
virtual void Cancel() OVERRIDE {
// Make sure the mouse_warp_mode allows warping. It can be stopped by a
// partial screenshot view.
internal::MouseCursorEventFilter* mouse_cursor_filter =
Shell::GetInstance()->mouse_cursor_filter();
mouse_cursor_filter->set_mouse_warp_mode(
internal::MouseCursorEventFilter::WARP_ALWAYS);
for (size_t i = 0; i < widgets_.size(); ++i)
widgets_[i]->Close();
}
virtual bool IsCancelingKeyEvent(ui::KeyEvent* event) OVERRIDE {
return event->key_code() == ui::VKEY_ESCAPE;
}
virtual aura::Window* GetWindow() OVERRIDE {
// Just returns NULL because this class does not handle key events in
// OverlayEventFilter, except for cancel keys.
return NULL;
}
// Overridden from views::WidgetObserver:
virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE {
widget->RemoveObserver(this);
widgets_.erase(std::remove(widgets_.begin(), widgets_.end(), widget));
if (widgets_.empty())
delete this;
}
private:
virtual ~OverlayDelegate() {
Shell::GetInstance()->overlay_filter()->Deactivate();
}
std::vector<views::Widget*> widgets_;
DISALLOW_COPY_AND_ASSIGN(OverlayDelegate);
};
// static
std::vector<PartialScreenshotView*>
PartialScreenshotView::StartPartialScreenshot(
ScreenshotDelegate* screenshot_delegate) {
std::vector<PartialScreenshotView*> views;
OverlayDelegate* overlay_delegate = new OverlayDelegate();
aura::Window::Windows root_windows = Shell::GetAllRootWindows();
for (aura::Window::Windows::iterator it = root_windows.begin();
it != root_windows.end(); ++it) {
PartialScreenshotView* new_view = new PartialScreenshotView(
overlay_delegate, screenshot_delegate);
new_view->Init(*it);
views.push_back(new_view);
}
return views;
}
PartialScreenshotView::PartialScreenshotView(
PartialScreenshotView::OverlayDelegate* overlay_delegate,
ScreenshotDelegate* screenshot_delegate)
: is_dragging_(false),
overlay_delegate_(overlay_delegate),
screenshot_delegate_(screenshot_delegate) {
}
PartialScreenshotView::~PartialScreenshotView() {
overlay_delegate_ = NULL;
screenshot_delegate_ = NULL;
}
void PartialScreenshotView::Init(aura::Window* root_window) {
views::Widget* widget = new views::Widget;
views::Widget::InitParams params(
views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
params.delegate = this;
// The partial screenshot rectangle has to be at the real top of
// the screen.
params.parent = Shell::GetContainer(
root_window,
internal::kShellWindowId_OverlayContainer);
widget->Init(params);
widget->SetContentsView(this);
widget->SetBounds(root_window->GetBoundsInScreen());
widget->GetNativeView()->SetName("PartialScreenshotView");
widget->StackAtTop();
widget->Show();
// Releases the mouse capture to let mouse events come to the view. This
// will close the context menu.
aura::client::CaptureClient* capture_client =
aura::client::GetCaptureClient(root_window);
if (capture_client->GetCaptureWindow())
capture_client->ReleaseCapture(capture_client->GetCaptureWindow());
overlay_delegate_->RegisterWidget(widget);
}
gfx::Rect PartialScreenshotView::GetScreenshotRect() const {
int left = std::min(start_position_.x(), current_position_.x());
int top = std::min(start_position_.y(), current_position_.y());
int width = ::abs(start_position_.x() - current_position_.x());
int height = ::abs(start_position_.y() - current_position_.y());
return gfx::Rect(left, top, width, height);
}
void PartialScreenshotView::OnSelectionStarted(const gfx::Point& position) {
start_position_ = position;
}
void PartialScreenshotView::OnSelectionChanged(const gfx::Point& position) {
if (is_dragging_ && current_position_ == position)
return;
current_position_ = position;
SchedulePaint();
is_dragging_ = true;
}
void PartialScreenshotView::OnSelectionFinished() {
overlay_delegate_->Cancel();
if (!is_dragging_)
return;
is_dragging_ = false;
if (screenshot_delegate_) {
aura::Window*root_window =
GetWidget()->GetNativeWindow()->GetRootWindow();
screenshot_delegate_->HandleTakePartialScreenshot(
root_window,
gfx::IntersectRects(root_window->bounds(), GetScreenshotRect()));
}
}
gfx::NativeCursor PartialScreenshotView::GetCursor(
const ui::MouseEvent& event) {
// Always use "crosshair" cursor.
return ui::kCursorCross;
}
void PartialScreenshotView::OnPaint(gfx::Canvas* canvas) {
if (is_dragging_) {
// Screenshot area representation: black rectangle with white
// rectangle inside. To avoid capturing these rectangles when mouse
// release, they should be outside of the actual capturing area.
gfx::Rect screenshot_rect = GetScreenshotRect();
screenshot_rect.Inset(-1, -1, -1, -1);
canvas->DrawRect(screenshot_rect, SK_ColorWHITE);
screenshot_rect.Inset(-1, -1, -1, -1);
canvas->DrawRect(screenshot_rect, SK_ColorBLACK);
}
}
bool PartialScreenshotView::OnMousePressed(const ui::MouseEvent& event) {
// Prevent moving across displays during drag. Capturing a screenshot across
// the displays is not supported yet.
// TODO(mukai): remove this restriction.
internal::MouseCursorEventFilter* mouse_cursor_filter =
Shell::GetInstance()->mouse_cursor_filter();
mouse_cursor_filter->set_mouse_warp_mode(
internal::MouseCursorEventFilter::WARP_NONE);
OnSelectionStarted(event.location());
return true;
}
bool PartialScreenshotView::OnMouseDragged(const ui::MouseEvent& event) {
OnSelectionChanged(event.location());
return true;
}
bool PartialScreenshotView::OnMouseWheel(const ui::MouseWheelEvent& event) {
// Do nothing but do not propagate events futhermore.
return true;
}
void PartialScreenshotView::OnMouseReleased(const ui::MouseEvent& event) {
OnSelectionFinished();
}
void PartialScreenshotView::OnMouseCaptureLost() {
is_dragging_ = false;
OnSelectionFinished();
}
void PartialScreenshotView::OnGestureEvent(ui::GestureEvent* event) {
switch(event->type()) {
case ui::ET_GESTURE_TAP_DOWN:
OnSelectionStarted(event->location());
break;
case ui::ET_GESTURE_SCROLL_UPDATE:
OnSelectionChanged(event->location());
break;
case ui::ET_GESTURE_SCROLL_END:
case ui::ET_SCROLL_FLING_START:
OnSelectionFinished();
break;
default:
break;
}
event->SetHandled();
}
} // namespace ash
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