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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 "chrome/browser/ui/panels/panel_bounds_animation.h"
#include "chrome/browser/ui/panels/panel.h"
#include "chrome/browser/ui/panels/panel_manager.h"
namespace {
// These values are experimental and subjective.
const int kDefaultFramerateHz = 50;
const int kSetBoundsAnimationMs = 180;
const int kSetBoundsAnimationBigMinimizeMs = 1500;
}
PanelBoundsAnimation::PanelBoundsAnimation(ui::AnimationDelegate* target,
Panel* panel,
const gfx::Rect& initial_bounds,
const gfx::Rect& final_bounds)
: ui::LinearAnimation(kDefaultFramerateHz, target),
panel_(panel),
for_big_minimize_(false),
animation_stop_to_show_titlebar_(0) {
// Detect animation that happens when expansion state is set to MINIMIZED
// and there is relatively big portion of the panel to hide from view.
// Initialize animation differently in this case, using fast-pause-slow
// method, see below for more details.
int duration = kSetBoundsAnimationMs;
if (initial_bounds.height() > final_bounds.height() &&
panel_->expansion_state() == Panel::MINIMIZED) {
double hidden_title_height =
panel_->TitleOnlyHeight() - final_bounds.height();
double distance_y = initial_bounds.height() - final_bounds.height();
animation_stop_to_show_titlebar_ = 1.0 - hidden_title_height / distance_y;
if (animation_stop_to_show_titlebar_ > 0.7) { // Relatively big movement.
for_big_minimize_ = true;
duration = kSetBoundsAnimationBigMinimizeMs;
}
}
SetDuration(PanelManager::AdjustTimeInterval(duration));
}
PanelBoundsAnimation::~PanelBoundsAnimation() {
}
double PanelBoundsAnimation::GetCurrentValue() const {
return ComputeAnimationValue(ui::LinearAnimation::GetCurrentValue(),
for_big_minimize_,
animation_stop_to_show_titlebar_);
}
double PanelBoundsAnimation::ComputeAnimationValue(double progress,
bool for_big_minimize, double animation_stop_to_show_titlebar) {
if (!for_big_minimize) {
// Cubic easing out.
double value = 1.0 - progress;
return 1.0 - value * value * value;
}
// Minimize animation is done in 3 steps:
// 1. Quickly (0 -> 0.15) make only titlebar visible.
// 2. Freeze for a little bit (0.15->0.6), just showing titlebar.
// 3. Slowly minimize to thin strip (0.6->1.0)
const double kProgressAtFreezeStart = 0.15;
const double kProgressAtFreezeEnd = 0.6;
double value;
if (progress <= kProgressAtFreezeStart) {
value = animation_stop_to_show_titlebar *
(progress / kProgressAtFreezeStart);
} else if (progress <= kProgressAtFreezeEnd) {
value = animation_stop_to_show_titlebar;
} else {
value = animation_stop_to_show_titlebar +
(1.0 - animation_stop_to_show_titlebar) *
((progress - kProgressAtFreezeEnd) / (1.0 - kProgressAtFreezeEnd));
}
return value;
}
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