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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/resize_shadow.h"
#include "grit/ui_resources.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/aura/window.h"
#include "ui/base/animation/slide_animation.h"
#include "ui/base/hit_test.h"
#include "ui/gfx/compositor/layer.h"
#include "ui/gfx/compositor/scoped_layer_animation_settings.h"
namespace {
// Height or width for the resize border shadow.
const int kShadowSize = 6;
// Amount to inset the resize effect from the window corners.
const int kShadowInset = 4;
// Color for resize effect.
const SkColor kShadowLayerColor = SkColorSetRGB(0, 0, 0);
// Final opacity for resize effect.
const int kShadowTargetOpacity = 64;
// Animation time for resize effect in milliseconds.
const int kShadowSlideDurationMs = 200;
} // namespace
namespace ash {
namespace internal {
ResizeShadow::ResizeShadow() {}
ResizeShadow::~ResizeShadow() {}
void ResizeShadow::Init(aura::Window* window) {
ui::Layer* parent = window->layer();
InitLayer(parent, &top_layer_);
InitLayer(parent, &left_layer_);
InitLayer(parent, &right_layer_);
InitLayer(parent, &bottom_layer_);
InitAnimation(&top_animation_);
InitAnimation(&left_animation_);
InitAnimation(&right_animation_);
InitAnimation(&bottom_animation_);
}
void ResizeShadow::ShowForHitTest(int hit_test) {
// TODO(jamescook): Add support for top_left, top_right, bottom_left, and
// bottom_right corners. This approach matches the mocks but looks a little
// funny.
bool top = false;
bool left = false;
bool right = false;
bool bottom = false;
switch (hit_test) {
case HTTOPLEFT:
top = true;
left = true;
break;
case HTTOP:
top = true;
break;
case HTTOPRIGHT:
top = true;
right = true;
break;
case HTLEFT:
left = true;
break;
case HTRIGHT:
right = true;
break;
case HTBOTTOMLEFT:
left = true;
bottom = true;
break;
case HTBOTTOM:
bottom = true;
break;
case HTBOTTOMRIGHT:
bottom = true;
right = true;
break;
default:
break;
}
if (top)
top_animation_->Show();
else
top_animation_->Hide();
if (left)
left_animation_->Show();
else
left_animation_->Hide();
if (right)
right_animation_->Show();
else
right_animation_->Hide();
if (bottom)
bottom_animation_->Show();
else
bottom_animation_->Hide();
}
void ResizeShadow::Hide() {
// Small optimization since we frequently invoke Hide().
if (top_animation_->IsShowing() ||
left_animation_->IsShowing() ||
right_animation_->IsShowing() ||
bottom_animation_->IsShowing())
ShowForHitTest(HTNOWHERE);
}
void ResizeShadow::Layout(const gfx::Rect& bounds) {
// Position the resize border effects near the window edges.
top_layer_->SetBounds(gfx::Rect(kShadowInset,
-kShadowSize,
bounds.width() - 2 * kShadowInset,
kShadowSize));
bottom_layer_->SetBounds(gfx::Rect(kShadowInset,
bounds.height(),
bounds.width() - 2 * kShadowInset,
kShadowSize));
left_layer_->SetBounds(gfx::Rect(-kShadowSize,
kShadowInset,
kShadowSize,
bounds.height() - 2 * kShadowInset));
right_layer_->SetBounds(gfx::Rect(bounds.width(),
kShadowInset,
kShadowSize,
bounds.height() - 2 * kShadowInset));
}
void ResizeShadow::AnimationProgressed(const ui::Animation* animation) {
int opacity = animation->CurrentValueBetween(0, kShadowTargetOpacity);
if (animation == top_animation_.get())
UpdateLayerOpacity(top_layer_.get(), opacity);
else if (animation == left_animation_.get())
UpdateLayerOpacity(left_layer_.get(), opacity);
else if (animation == right_animation_.get())
UpdateLayerOpacity(right_layer_.get(), opacity);
else if (animation == bottom_animation_.get())
UpdateLayerOpacity(bottom_layer_.get(), opacity);
}
void ResizeShadow::InitLayer(ui::Layer* parent,
scoped_ptr<ui::Layer>* new_layer) {
// Use solid colors because they don't require video memory.
new_layer->reset(new ui::Layer(ui::Layer::LAYER_SOLID_COLOR));
// Transparency must be part of the color for solid color layers.
// Start fully transparent so we can smoothly animate in.
new_layer->get()->SetColor(SkColorSetARGB(0, 0, 0, 0));
new_layer->get()->SetVisible(false);
parent->Add(new_layer->get());
}
void ResizeShadow::InitAnimation(scoped_ptr<ui::SlideAnimation>* animation) {
animation->reset(new ui::SlideAnimation(this));
animation->get()->SetSlideDuration(kShadowSlideDurationMs);
}
void ResizeShadow::UpdateLayerOpacity(ui::Layer* layer, int opacity) {
SkColor color = SkColorSetA(kShadowLayerColor, opacity);
layer->SetColor(color);
layer->SetVisible(opacity != 0);
}
} // namespace internal
} // namespace ash
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