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// Copyright 2013 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/dock/docked_window_resizer.h"
#include "ash/ash_switches.h"
#include "ash/launcher/launcher.h"
#include "ash/root_window_controller.h"
#include "ash/screen_ash.h"
#include "ash/shelf/shelf_types.h"
#include "ash/shelf/shelf_widget.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/coordinate_conversion.h"
#include "ash/wm/dock/docked_window_layout_manager.h"
#include "ash/wm/property_util.h"
#include "ash/wm/window_properties.h"
#include "ash/wm/workspace_controller.h"
#include "base/command_line.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/env.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/base/hit_test.h"
#include "ui/base/ui_base_types.h"
#include "ui/gfx/screen.h"
#include "ui/views/widget/widget.h"
namespace ash {
namespace {
// Distance in pixels that the cursor must move past an edge for a window
// to move beyond that edge.
const int kStickyDistance = 64;
// How far in pixels we have to drag to undock a window.
const int kSnapToDockDistance = 32;
} // namespace
DockedWindowResizer::~DockedWindowResizer() {
if (destroyed_)
*destroyed_ = true;
}
// static
DockedWindowResizer*
DockedWindowResizer::Create(WindowResizer* next_window_resizer,
aura::Window* window,
const gfx::Point& location,
int window_component,
aura::client::WindowMoveSource source) {
Details details(window, location, window_component, source);
return details.is_resizable ?
new DockedWindowResizer(next_window_resizer, details) : NULL;
}
void DockedWindowResizer::Drag(const gfx::Point& location, int event_flags) {
last_location_ = location;
wm::ConvertPointToScreen(GetTarget()->parent(), &last_location_);
bool destroyed = false;
if (!did_move_or_resize_) {
did_move_or_resize_ = true;
StartedDragging();
}
gfx::Point offset;
gfx::Rect bounds(CalculateBoundsForDrag(details_, location));
bool set_tracked_by_workspace = MaybeSnapToEdge(bounds, &offset);
// Temporarily clear kWindowTrackedByWorkspaceKey for windows that are snapped
// to screen edges e.g. when they are docked. This prevents the windows from
// getting snapped to other nearby windows during the drag.
bool tracked_by_workspace = GetTrackedByWorkspace(GetTarget());
if (set_tracked_by_workspace)
SetTrackedByWorkspace(GetTarget(), false);
gfx::Point modified_location(location.x() + offset.x(),
location.y() + offset.y());
destroyed_ = &destroyed;
next_window_resizer_->Drag(modified_location, event_flags);
// TODO(varkha): Refactor the way WindowResizer calls into other window
// resizers to avoid the awkward pattern here for checking if
// next_window_resizer_ destroys the resizer object.
if (destroyed)
return;
destroyed_ = NULL;
if (set_tracked_by_workspace)
SetTrackedByWorkspace(GetTarget(), tracked_by_workspace);
}
void DockedWindowResizer::CompleteDrag(int event_flags) {
// Temporarily clear kWindowTrackedByWorkspaceKey for panels so that they
// don't get forced into the workspace that may be shrunken because of docked
// windows.
bool tracked_by_workspace = GetTrackedByWorkspace(GetTarget());
bool set_tracked_by_workspace =
(was_docked_ && GetTarget()->type() == aura::client::WINDOW_TYPE_PANEL);
if (set_tracked_by_workspace)
SetTrackedByWorkspace(GetTarget(), false);
// The root window can change when dragging into a different screen.
next_window_resizer_->CompleteDrag(event_flags);
if (set_tracked_by_workspace)
SetTrackedByWorkspace(GetTarget(), tracked_by_workspace);
FinishDragging();
}
void DockedWindowResizer::RevertDrag() {
// Temporarily clear kWindowTrackedByWorkspaceKey for panels so that they
// don't get forced into the workspace that may be shrunken because of docked
// windows.
bool tracked_by_workspace = GetTrackedByWorkspace(GetTarget());
bool set_tracked_by_workspace =
(was_docked_ && GetTarget()->type() == aura::client::WINDOW_TYPE_PANEL);
if (set_tracked_by_workspace)
SetTrackedByWorkspace(GetTarget(), false);
next_window_resizer_->RevertDrag();
if (set_tracked_by_workspace)
SetTrackedByWorkspace(GetTarget(), tracked_by_workspace);
FinishDragging();
}
aura::Window* DockedWindowResizer::GetTarget() {
return next_window_resizer_->GetTarget();
}
const gfx::Point& DockedWindowResizer::GetInitialLocation() const {
return details_.initial_location_in_parent;
}
DockedWindowResizer::DockedWindowResizer(WindowResizer* next_window_resizer,
const Details& details)
: details_(details),
next_window_resizer_(next_window_resizer),
dock_layout_(NULL),
did_move_or_resize_(false),
was_docked_(false),
destroyed_(NULL) {
DCHECK(details_.is_resizable);
aura::Window* dock_container = Shell::GetContainer(
details.window->GetRootWindow(),
internal::kShellWindowId_DockedContainer);
DCHECK(dock_container->id() == internal::kShellWindowId_DockedContainer);
dock_layout_ = static_cast<internal::DockedWindowLayoutManager*>(
dock_container->layout_manager());
was_docked_ = details.window->parent() == dock_container;
}
bool DockedWindowResizer::MaybeSnapToEdge(const gfx::Rect& bounds,
gfx::Point* offset) {
aura::Window* dock_container = Shell::GetContainer(
wm::GetRootWindowAt(last_location_),
internal::kShellWindowId_DockedContainer);
DCHECK(dock_container->id() == internal::kShellWindowId_DockedContainer);
internal::DockedWindowLayoutManager* dock_layout =
static_cast<internal::DockedWindowLayoutManager*>(
dock_container->layout_manager());
internal::DockedAlignment dock_alignment = dock_layout->CalculateAlignment();
gfx::Rect dock_bounds = ScreenAsh::ConvertRectFromScreen(
GetTarget()->parent(), dock_container->GetBoundsInScreen());
// Windows only snap magnetically when they are close to the edge of the
// screen and when the cursor is over other docked windows.
// When a window being dragged is the last window that was previously
// docked it is still allowed to magnetically snap to either side.
bool can_snap = was_docked_ ||
internal::DockedWindowLayoutManager::ShouldWindowDock(GetTarget(),
last_location_);
if (!can_snap)
return false;
if (dock_alignment == internal::DOCKED_ALIGNMENT_LEFT ||
(dock_alignment == internal::DOCKED_ALIGNMENT_NONE && was_docked_)) {
const int distance = bounds.x() - dock_bounds.x();
if (distance < kSnapToDockDistance && distance > -kStickyDistance) {
offset->set_x(-distance);
return true;
}
}
if (dock_alignment == internal::DOCKED_ALIGNMENT_RIGHT ||
(dock_alignment == internal::DOCKED_ALIGNMENT_NONE && was_docked_)) {
const int distance = dock_bounds.right() - bounds.right();
if (distance < kSnapToDockDistance && distance > -kStickyDistance) {
offset->set_x(distance);
return true;
}
}
return false;
}
void DockedWindowResizer::StartedDragging() {
// Tell the dock layout manager that we are dragging this window.
dock_layout_->StartDragging(GetTarget());
}
void DockedWindowResizer::FinishDragging() {
if (!did_move_or_resize_)
return;
aura::Window* window = GetTarget();
bool should_dock = was_docked_;
if ((details_.bounds_change & WindowResizer::kBoundsChange_Repositions) &&
!(details_.bounds_change & WindowResizer::kBoundsChange_Resizes) &&
CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAshEnableDockedWindows)) {
const bool attached_panel =
window->type() == aura::client::WINDOW_TYPE_PANEL &&
window->GetProperty(internal::kPanelAttachedKey);
should_dock = !attached_panel &&
internal::DockedWindowLayoutManager::ShouldWindowDock(window,
last_location_);
}
// Check if desired docked state is not same as current.
// If not same dock or undock accordingly.
if (should_dock !=
(window->parent()->id() == internal::kShellWindowId_DockedContainer)) {
if (should_dock) {
aura::Window* dock_container = Shell::GetContainer(
window->GetRootWindow(),
internal::kShellWindowId_DockedContainer);
dock_container->AddChild(window);
} else {
// Reparent the window back to workspace.
// We need to be careful to give SetDefaultParentByRootWindow location in
// the right root window (matching the logic in DragWindowResizer) based
// on which root window a mouse pointer is in. We want to undock into the
// right screen near the edge of a multiscreen setup (based on where the
// mouse is).
gfx::Rect near_last_location(last_location_, gfx::Size());
// Reparenting will cause Relayout and possible dock shrinking.
window->SetDefaultParentByRootWindow(window->GetRootWindow(),
near_last_location);
}
}
dock_layout_->FinishDragging();
}
} // namespace aura
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