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// 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 <memory>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/optional.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, public gfx::AnimationDelegate {
public:
METADATA_HEADER(ProgressBar);
// The preferred height parameter makes it easier to use a ProgressBar with
// layout managers that size to preferred size.
explicit ProgressBar(int preferred_height = 5,
bool allow_round_corner = true);
~ProgressBar() override;
// View:
void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
gfx::Size CalculatePreferredSize() const override;
void VisibilityChanged(View* starting_from, bool is_visible) override;
void AddedToWidget() override;
void OnPaint(gfx::Canvas* canvas) override;
double GetValue() const;
// 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);
// The color of the progress portion.
SkColor GetForegroundColor() const;
void SetForegroundColor(SkColor color);
// The color of the portion that displays potential progress.
SkColor GetBackgroundColor() const;
void SetBackgroundColor(SkColor color);
protected:
int preferred_height() const { return preferred_height_; }
private:
// gfx::AnimationDelegate:
void AnimationProgressed(const gfx::Animation* animation) override;
void AnimationEnded(const gfx::Animation* animation) override;
bool IsIndeterminate();
void OnPaintIndeterminate(gfx::Canvas* canvas);
// Fire an accessibility event if visible and the progress has changed.
void MaybeNotifyAccessibilityValueChanged();
// Current progress to display, should be in the range 0.0 to 1.0.
double current_value_ = 0.0;
// In DP, the preferred height of this progress bar.
const int preferred_height_;
const bool allow_round_corner_;
base::Optional<SkColor> foreground_color_;
base::Optional<SkColor> background_color_;
std::unique_ptr<gfx::LinearAnimation> indeterminate_bar_animation_;
int last_announced_percentage_ = -1;
DISALLOW_COPY_AND_ASSIGN(ProgressBar);
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_PROGRESS_BAR_H_
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