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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/launcher/launcher_button.h"
#include <algorithm>
#include "ash/launcher/launcher_button_host.h"
#include "ui/base/accessibility/accessible_view_state.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/compositor/layer.h"
#include "ui/gfx/compositor/scoped_layer_animation_settings.h"
#include "ui/views/controls/image_view.h"
namespace {
const int kBarHeight = 4;
const int kBarSpacing = 6;
const int kIconHeight = 32;
const int kIconWidth = 48;
const int kHopSpacing = 2;
const int kActiveBarColor = 0xe6ffffff;
const int kInactiveBarColor = 0x80ffffff;
const int kHopUpMS = 130;
const int kHopDownMS = 260;
// Used to allow Mouse...() messages to go to the parent view.
class MouseIgnoredView : public views::View {
public:
bool HitTest(const gfx::Point& l) const OVERRIDE {
return false;
}
};
bool ShouldHop(int state) {
return state & ash::internal::LauncherButton::STATE_HOVERED ||
state & ash::internal::LauncherButton::STATE_ACTIVE;
}
} // namespace
namespace ash {
namespace internal {
LauncherButton::IconView::IconView() : icon_size_(kIconHeight) {
}
LauncherButton::IconView::~IconView() {
}
bool LauncherButton::IconView::HitTest(const gfx::Point& l) const {
return false;
}
LauncherButton* LauncherButton::Create(views::ButtonListener* listener,
LauncherButtonHost* host) {
LauncherButton* button = new LauncherButton(listener, host);
button->Init();
return button;
}
LauncherButton::LauncherButton(views::ButtonListener* listener,
LauncherButtonHost* host)
: CustomButton(listener),
host_(host),
icon_view_(NULL),
bar_(new MouseIgnoredView),
state_(STATE_NORMAL) {
set_accessibility_focusable(true);
}
LauncherButton::~LauncherButton() {
if (!bar_->parent())
delete bar_;
}
void LauncherButton::SetImage(const SkBitmap& image) {
if (image.empty()) {
// TODO: need an empty image.
icon_view_->SetImage(&image);
return;
}
if (icon_view_->icon_size() == 0) {
icon_view_->SetImage(&image);
return;
}
// Resize the image maintaining our aspect ratio.
int pref = icon_view_->icon_size();
float aspect_ratio =
static_cast<float>(image.width()) / static_cast<float>(image.height());
int height = pref;
int width = static_cast<int>(aspect_ratio * height);
if (width > pref) {
width = pref;
height = static_cast<int>(width / aspect_ratio);
}
if (width == image.width() && height == image.height()) {
icon_view_->SetImage(&image);
return;
}
gfx::CanvasSkia canvas(gfx::Size(width, height), false);
canvas.DrawBitmapInt(image, 0, 0, image.width(), image.height(),
0, 0, width, height, false);
SkBitmap resized_image(canvas.ExtractBitmap());
icon_view_->SetImage(&resized_image);
}
void LauncherButton::AddState(State state) {
if (!(state_ & state)) {
if (ShouldHop(state) || !ShouldHop(state_)) {
ui::ScopedLayerAnimationSettings scoped_setter(
icon_view_->layer()->GetAnimator());
scoped_setter.SetTransitionDuration(
base::TimeDelta::FromMilliseconds(kHopUpMS));
state_ |= state;
UpdateState();
} else {
state_ |= state;
UpdateState();
}
}
}
void LauncherButton::ClearState(State state) {
if (state_ & state) {
if (!ShouldHop(state) || ShouldHop(state_)) {
ui::ScopedLayerAnimationSettings scoped_setter(
icon_view_->layer()->GetAnimator());
scoped_setter.SetTransitionDuration(
base::TimeDelta::FromMilliseconds(kHopDownMS));
state_ &= ~state;
UpdateState();
} else {
state_ &= ~state;
UpdateState();
}
}
}
gfx::Rect LauncherButton::GetIconBounds() const {
return icon_view_->bounds();
}
bool LauncherButton::OnMousePressed(const views::MouseEvent& event) {
CustomButton::OnMousePressed(event);
host_->MousePressedOnButton(this, event);
return true;
}
void LauncherButton::OnMouseReleased(const views::MouseEvent& event) {
host_->MouseReleasedOnButton(this, false);
CustomButton::OnMouseReleased(event);
}
void LauncherButton::OnMouseCaptureLost() {
ClearState(STATE_HOVERED);
host_->MouseReleasedOnButton(this, true);
CustomButton::OnMouseCaptureLost();
}
bool LauncherButton::OnMouseDragged(const views::MouseEvent& event) {
CustomButton::OnMouseDragged(event);
host_->MouseDraggedOnButton(this, event);
return true;
}
void LauncherButton::OnMouseEntered(const views::MouseEvent& event) {
AddState(STATE_HOVERED);
CustomButton::OnMouseEntered(event);
host_->MouseExitedButton(this);
}
void LauncherButton::OnMouseExited(const views::MouseEvent& event) {
ClearState(STATE_HOVERED);
CustomButton::OnMouseExited(event);
host_->MouseExitedButton(this);
}
void LauncherButton::GetAccessibleState(ui::AccessibleViewState* state) {
state->role = ui::AccessibilityTypes::ROLE_PUSHBUTTON;
state->name = host_->GetAccessibleName(this);
}
void LauncherButton::Layout() {
int image_x = (width() - icon_view_->width()) / 2;
int image_y = height() - (icon_view_->height() + kBarHeight + kBarSpacing);
if (ShouldHop(state_))
image_y -= kHopSpacing;
icon_view_->SetPosition(gfx::Point(image_x, image_y));
bar_->SetBounds(0, height() - kBarHeight, width(), kBarHeight);
}
bool LauncherButton::GetTooltipText(
const gfx::Point& p, string16* tooltip) const {
DCHECK(tooltip);
tooltip->assign(host_->GetAccessibleName(this));
return true;
}
void LauncherButton::Init() {
icon_view_ = CreateIconView();
// TODO: refactor the layers so each button doesn't require 2.
icon_view_->SetPaintToLayer(true);
icon_view_->SetFillsBoundsOpaquely(false);
icon_view_->SetSize(gfx::Size(kIconWidth, kIconHeight));
icon_view_->SetHorizontalAlignment(views::ImageView::CENTER);
icon_view_->SetVerticalAlignment(views::ImageView::CENTER);
AddChildView(icon_view_);
}
LauncherButton::IconView* LauncherButton::CreateIconView() {
return new IconView;
}
void LauncherButton::UpdateState() {
if (state_ == STATE_NORMAL) {
if (bar_->parent())
RemoveChildView(bar_);
} else {
if (!bar_->parent())
AddChildView(bar_);
if (state_ & STATE_HOVERED || state_ & STATE_ACTIVE) {
bar_->set_background(views::Background::CreateSolidBackground(
kActiveBarColor));
} else if (state_ & STATE_RUNNING) {
bar_->set_background(views::Background::CreateSolidBackground(
kInactiveBarColor));
}
}
Layout();
SchedulePaint();
}
} // namespace internal
} // namespace ash
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