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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 "ash/shell.h"
#include "ash/wm/workspace/workspace_manager.h"
#include "ui/base/events/event.h"
#include "ui/base/events/event_utils.h"
namespace ash {
namespace internal {
namespace {
// The required vertical distance to scrub to the next workspace.
const int kWorkspaceStepSize = 10;
// Returns true is scrubbing is enabled.
bool IsScrubbingEnabled() {
// Scrubbing is disabled if the screen is locked or a modal dialog is open.
return !Shell::GetInstance()->IsScreenLocked() &&
!Shell::GetInstance()->IsSystemModalWindowOpen();
}
} // namespace
WorkspaceCycler::WorkspaceCycler(WorkspaceManager* workspace_manager)
: workspace_manager_(workspace_manager),
scrubbing_(false),
scroll_x_(0),
scroll_y_(0) {
ash::Shell::GetInstance()->AddPreTargetHandler(this);
}
WorkspaceCycler::~WorkspaceCycler() {
scrubbing_ = false;
ash::Shell::GetInstance()->RemovePreTargetHandler(this);
}
void WorkspaceCycler::OnScrollEvent(ui::ScrollEvent* event) {
if (event->finger_count() != 3 ||
event->type() != ui::ET_SCROLL) {
scrubbing_ = false;
return;
}
if (!IsScrubbingEnabled()) {
scrubbing_ = false;
return;
}
if (!scrubbing_) {
scrubbing_ = true;
scroll_x_ = 0;
scroll_y_ = 0;
}
if (ui::IsNaturalScrollEnabled()) {
scroll_x_ += event->x_offset();
scroll_y_ += event->y_offset();
} else {
scroll_x_ -= event->x_offset();
scroll_y_ -= event->y_offset();
}
// TODO(pkotwicz): Implement scrubbing through several workspaces as the
// result of a single scroll event.
if (std::abs(scroll_y_) > kWorkspaceStepSize) {
workspace_manager_->CycleToWorkspace(scroll_y_ > 0 ?
WorkspaceManager::CYCLE_NEXT : WorkspaceManager::CYCLE_PREVIOUS);
scroll_x_ = 0;
scroll_y_ = 0;
event->SetHandled();
return;
}
if (std::abs(scroll_x_) > kWorkspaceStepSize) {
// Update |scroll_x_| and |scroll_y_| such that workspaces are only cycled
// through when 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;
scroll_y_ = 0;
}
// The active workspace was not changed, do not consume the event.
}
} // namespace internal
} // namespace ash
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