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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/ui/panels/panel_bounds_animation.h"
      6 
      7 #include "chrome/browser/ui/panels/panel.h"
      8 #include "chrome/browser/ui/panels/panel_manager.h"
      9 
     10 namespace {
     11 
     12 // These values are experimental and subjective.
     13 const int kDefaultFramerateHz = 50;
     14 const int kSetBoundsAnimationMs = 180;
     15 const int kSetBoundsAnimationBigMinimizeMs = 1500;
     16 
     17 }
     18 
     19 PanelBoundsAnimation::PanelBoundsAnimation(gfx::AnimationDelegate* target,
     20                                            Panel* panel,
     21                                            const gfx::Rect& initial_bounds,
     22                                            const gfx::Rect& final_bounds)
     23     : gfx::LinearAnimation(kDefaultFramerateHz, target),
     24       panel_(panel),
     25       for_big_minimize_(false),
     26       animation_stop_to_show_titlebar_(0) {
     27   // Detect animation that happens when expansion state is set to MINIMIZED
     28   // and there is relatively big portion of the panel to hide from view.
     29   // Initialize animation differently in this case, using fast-pause-slow
     30   // method, see below for more details.
     31   int duration = kSetBoundsAnimationMs;
     32   if (initial_bounds.height() > final_bounds.height() &&
     33       panel_->expansion_state() == Panel::MINIMIZED) {
     34     double hidden_title_height =
     35         panel_->TitleOnlyHeight() - final_bounds.height();
     36     double distance_y = initial_bounds.height() - final_bounds.height();
     37     animation_stop_to_show_titlebar_ = 1.0 - hidden_title_height / distance_y;
     38     if (animation_stop_to_show_titlebar_ > 0.7) {  // Relatively big movement.
     39       for_big_minimize_ = true;
     40       duration = kSetBoundsAnimationBigMinimizeMs;
     41     }
     42   }
     43   SetDuration(PanelManager::AdjustTimeInterval(duration));
     44 }
     45 
     46 PanelBoundsAnimation::~PanelBoundsAnimation() {
     47 }
     48 
     49 double PanelBoundsAnimation::GetCurrentValue() const {
     50   return ComputeAnimationValue(gfx::LinearAnimation::GetCurrentValue(),
     51                                for_big_minimize_,
     52                                animation_stop_to_show_titlebar_);
     53 }
     54 
     55 double PanelBoundsAnimation::ComputeAnimationValue(double progress,
     56     bool for_big_minimize, double animation_stop_to_show_titlebar) {
     57   if (!for_big_minimize) {
     58     // Cubic easing out.
     59     double value = 1.0 - progress;
     60     return 1.0 - value * value * value;
     61   }
     62 
     63   // Minimize animation is done in 3 steps:
     64   // 1. Quickly (0 -> 0.15) make only titlebar visible.
     65   // 2. Freeze for a little bit (0.15->0.6), just showing titlebar.
     66   // 3. Slowly minimize to thin strip (0.6->1.0)
     67   const double kProgressAtFreezeStart = 0.15;
     68   const double kProgressAtFreezeEnd = 0.6;
     69   double value;
     70   if (progress <= kProgressAtFreezeStart) {
     71     value = animation_stop_to_show_titlebar *
     72         (progress / kProgressAtFreezeStart);
     73   } else if (progress <= kProgressAtFreezeEnd) {
     74     value = animation_stop_to_show_titlebar;
     75   } else {
     76     value = animation_stop_to_show_titlebar +
     77         (1.0 - animation_stop_to_show_titlebar) *
     78         ((progress - kProgressAtFreezeEnd) / (1.0 - kProgressAtFreezeEnd));
     79   }
     80   return value;
     81 }
     82