Implement progress bar spec (determinate and indeterminate).

ui/views/controls/progress_bar.h

 // Copyright (c) 2011 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.
 
 #ifndef UI_VIEWS_CONTROLS_PROGRESS_BAR_H_
 #define UI_VIEWS_CONTROLS_PROGRESS_BAR_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "ui/gfx/animation/animation_delegate.h"
 #include "ui/views/view.h"
 
+namespace gfx {
+class LinearAnimation;
+}
+
 namespace views {
 
 // Progress bar is a control that indicates progress visually.
-class VIEWS_EXPORT ProgressBar : public View {
+class VIEWS_EXPORT ProgressBar : public View, public gfx::AnimationDelegate {
  public:
   // The value range defaults to [0.0, 1.0].
   ProgressBar();
   ~ProgressBar() override;
 
+  // This convenience function makes it easier to use ProgressBars with layout
+  // managers that size to preferred size.
+  void set_preferred_height(int preferred_height) {

[sky, 2016/09/13 02:30:08]

If the value changes won't this need to trigger a layout? Or at least
PreferredSizeChanged?

[Evan Stade, 2016/09/13 15:45:39]

Yea but I would expect that this is called by the owner, which should be aware
of the need to re-layout. It's really meant to be called before the first
layout, so I guess I can just make it an optional ctor parameter.

+    preferred_height_ = preferred_height;
+  }
+
+  // Overridden from View:
+  void GetAccessibleState(ui::AXViewState* state) override;
+  gfx::Size GetPreferredSize() const override;
+  const char* GetClassName() const override;
+  void OnPaint(gfx::Canvas* canvas) override;
+
   double current_value() const { return current_value_; }
 
-  // Gets a normalized current value in [0.0, 1.0] range based on current value
-  // range and the min/max display value range.
-  double GetNormalizedValue() const;
-
-  // Sets the inclusive range of values to be displayed.  Values outside of the
-  // range will be capped when displayed.
-  void SetDisplayRange(double min_display_value, double max_display_value);
-
-  // Sets the current value.  Values outside of the range [min_display_value_,
-  // max_display_value_] will be stored unmodified and capped for display.
+  // Sets the current value. Values outside of the display range of 0.0-1.0 will
+  // be displayed with an infinite loading animation.
   void SetValue(double value);
 
-  // Sets the tooltip text.  Default behavior for a progress bar is to show no
-  // tooltip on mouse hover. Calling this lets you set a custom tooltip.  To
-  // revert to default behavior, call this with an empty string.
-  void SetTooltipText(const base::string16& tooltip_text);
+ protected:
+  // The color of the progress portion.
+  SkColor GetForegroundColor() const;
+  // The color of the portion that displays potential progress.
+  SkColor GetBackgroundColor() const;
 
-  // Overridden from View:
-  bool GetTooltipText(const gfx::Point& p,
-                      base::string16* tooltip) const override;
-  void GetAccessibleState(ui::AXViewState* state) override;
+  int preferred_height() const { return preferred_height_; }
 
  private:
   static const char kViewClassName[];
 
-  // Overridden from View:
-  gfx::Size GetPreferredSize() const override;
-  const char* GetClassName() const override;
-  void OnPaint(gfx::Canvas* canvas) override;
+  // gfx::AnimationDelegate:
+  void AnimationProgressed(const gfx::Animation* animation) override;
+  void AnimationEnded(const gfx::Animation* animation) override;
 
-  // Inclusive range used when displaying values.
-  double min_display_value_;
-  double max_display_value_;
+  bool IsIndeterminate();
+  void OnPaintIndeterminate(gfx::Canvas* canvas);
 
-  // Current value.  May be outside of [min_display_value_, max_display_value_].
+  // Current progress to display, should be in the range 0.0 to 1.0.
   double current_value_;
 
-  // Tooltip text.
-  base::string16 tooltip_text_;
+  // In DP, the preferred height of this progress bar. Default is 5.
+  int preferred_height_;

[sky, 2016/09/13 02:30:08]

optional: = 5 and remove comment about default.

[Evan Stade, 2016/09/13 15:45:39]

default moved to ctor

+
+  std::unique_ptr<gfx::LinearAnimation> indeterminate_bar_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(ProgressBar);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_PROGRESS_BAR_H_