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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/shelf/background_animator.h"
namespace ash {
namespace internal {
namespace {
// Duration of the background animation.
const int kBackgroundDurationMS = 1000;
}
BackgroundAnimator::BackgroundAnimator(BackgroundAnimatorDelegate* delegate,
int min_alpha,
int max_alpha)
: delegate_(delegate),
min_alpha_(min_alpha),
max_alpha_(max_alpha),
animation_(this),
paints_background_(false),
alpha_(min_alpha) {
animation_.SetSlideDuration(kBackgroundDurationMS);
}
BackgroundAnimator::~BackgroundAnimator() {
}
void BackgroundAnimator::SetDuration(int time_in_ms) {
animation_.SetSlideDuration(time_in_ms);
}
void BackgroundAnimator::SetPaintsBackground(
bool value, BackgroundAnimatorChangeType type) {
if (paints_background_ == value)
return;
paints_background_ = value;
if (type == BACKGROUND_CHANGE_IMMEDIATE && !animation_.is_animating()) {
animation_.Reset(value ? 1.0f : 0.0f);
AnimationProgressed(&animation_);
return;
}
if (paints_background_)
animation_.Show();
else
animation_.Hide();
}
void BackgroundAnimator::AnimationProgressed(const gfx::Animation* animation) {
int alpha = animation->CurrentValueBetween(min_alpha_, max_alpha_);
if (alpha_ == alpha)
return;
alpha_ = alpha;
delegate_->UpdateBackground(alpha_);
}
} // namespace internal
} // namespace ash
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