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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/workspace/workspace_cycler.h"
#include <cmath>
#include "ash/session_state_delegate.h"
#include "ash/shell.h"
#include "ash/wm/workspace/workspace_cycler_configuration.h"
#include "ash/wm/workspace/workspace_manager.h"
#include "ui/base/events/event.h"
#include "ui/base/events/event_utils.h"
typedef ash::WorkspaceCyclerConfiguration Config;
namespace ash {
namespace internal {
namespace {
// Returns true if cycling is allowed.
bool IsCyclingAllowed() {
// Cycling is disabled if the screen is locked or a modal dialog is open.
return !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
!Shell::GetInstance()->IsSystemModalWindowOpen();
}
} // namespace
WorkspaceCycler::WorkspaceCycler(WorkspaceManager* workspace_manager)
: workspace_manager_(workspace_manager),
animator_(NULL),
state_(NOT_CYCLING),
scroll_x_(0.0f),
scroll_y_(0.0f) {
ash::Shell::GetInstance()->AddPreTargetHandler(this);
}
WorkspaceCycler::~WorkspaceCycler() {
SetState(NOT_CYCLING);
ash::Shell::GetInstance()->RemovePreTargetHandler(this);
}
void WorkspaceCycler::AbortCycling() {
SetState(NOT_CYCLING);
}
void WorkspaceCycler::SetState(State new_state) {
if (state_ == NOT_CYCLING_TRACKING_SCROLL && new_state == STOPPING_CYCLING)
new_state = NOT_CYCLING;
if (state_ == new_state || !IsValidNextState(new_state))
return;
state_ = new_state;
if (new_state == STARTING_CYCLING) {
animator_.reset(new WorkspaceCyclerAnimator(this));
workspace_manager_->InitWorkspaceCyclerAnimatorWithCurrentState(
animator_.get());
animator_->AnimateStartingCycler();
} else if (new_state == STOPPING_CYCLING) {
if (animator_.get())
animator_->AnimateStoppingCycler();
} else if (new_state == NOT_CYCLING) {
scroll_x_ = 0.0f;
scroll_y_ = 0.0f;
if (animator_.get()) {
animator_->AbortAnimations();
animator_.reset();
}
}
}
bool WorkspaceCycler::IsValidNextState(State next_state) const {
if (state_ == next_state)
return true;
switch (next_state) {
case NOT_CYCLING:
return true;
case NOT_CYCLING_TRACKING_SCROLL:
return state_ == NOT_CYCLING;
case STARTING_CYCLING:
return state_ == NOT_CYCLING_TRACKING_SCROLL;
case CYCLING:
return state_ == STARTING_CYCLING;
case STOPPING_CYCLING:
return (state_ == STARTING_CYCLING || state_ == CYCLING);
}
NOTREACHED();
return false;
}
void WorkspaceCycler::OnEvent(ui::Event* event) {
if (!IsCyclingAllowed())
SetState(NOT_CYCLING);
if (state_ != NOT_CYCLING) {
if (event->type() == ui::ET_SCROLL_FLING_START ||
event->type() == ui::ET_MOUSE_PRESSED ||
event->type() == ui::ET_MOUSE_RELEASED ||
event->IsKeyEvent()) {
SetState(STOPPING_CYCLING);
event->StopPropagation();
return;
}
}
ui::EventHandler::OnEvent(event);
}
void WorkspaceCycler::OnScrollEvent(ui::ScrollEvent* event) {
if (event->finger_count() != 3 ||
event->type() != ui::ET_SCROLL) {
if (state_ != NOT_CYCLING)
event->StopPropagation();
return;
}
if (!IsCyclingAllowed() ||
!workspace_manager_->CanStartCyclingThroughWorkspaces()) {
DCHECK_EQ(NOT_CYCLING, state_);
return;
}
if (state_ == NOT_CYCLING)
SetState(NOT_CYCLING_TRACKING_SCROLL);
if (ui::IsNaturalScrollEnabled()) {
scroll_x_ += event->x_offset_ordinal();
scroll_y_ += event->y_offset_ordinal();
} else {
scroll_x_ -= event->x_offset_ordinal();
scroll_y_ -= event->y_offset_ordinal();
}
if (state_ == NOT_CYCLING_TRACKING_SCROLL) {
double distance_to_initiate_cycling = Config::GetDouble(
Config::DISTANCE_TO_INITIATE_CYCLING);
if (fabs(scroll_x_) > distance_to_initiate_cycling) {
// Only initiate workspace cycling if there recently was a significant
// amount of vertical movement as opposed to vertical movement
// accumulated over a long horizontal three finger scroll.
scroll_x_ = 0.0f;
scroll_y_ = 0.0f;
}
if (fabs(scroll_y_) >= distance_to_initiate_cycling)
SetState(STARTING_CYCLING);
}
if (state_ == CYCLING && event->y_offset_ordinal() != 0.0f) {
DCHECK(animator_.get());
animator_->AnimateCyclingByScrollDelta(event->y_offset_ordinal());
event->SetHandled();
}
}
void WorkspaceCycler::StartWorkspaceCyclerAnimationFinished() {
DCHECK_EQ(STARTING_CYCLING, state_);
SetState(CYCLING);
}
void WorkspaceCycler::StopWorkspaceCyclerAnimationFinished() {
DCHECK_EQ(STOPPING_CYCLING, state_);
Workspace* workspace_to_activate = animator_->get_selected_workspace();
animator_.reset();
SetState(NOT_CYCLING);
// Activate the workspace after updating the state so that a call to
// AbortCycling() as a result of SetActiveWorkspaceFromCycler() is a noop.
workspace_manager_->SetActiveWorkspaceFromCycler(workspace_to_activate);
}
} // namespace internal
} // namespace ash
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