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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 "ui/views/controls/progress_bar.h"
#include <algorithm>
#include <cmath>
#include <string>
#include "base/logging.h"
#include "base/macros.h"
#include "cc/paint/paint_flags.h"
#include "third_party/skia/include/core/SkPath.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/gfx/animation/linear_animation.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_utils.h"
#include "ui/native_theme/native_theme.h"
namespace views {
namespace {
// In DP, the amount to round the corners of the progress bar (both bg and
// fg, aka slice).
const int kCornerRadius = 3;
// Adds a rectangle to the path. The corners will be rounded if there is room.
void AddPossiblyRoundRectToPath(const gfx::Rect& rectangle,
bool allow_round_corner,
SkPath* path) {
if (!allow_round_corner || rectangle.height() < kCornerRadius) {
path->addRect(gfx::RectToSkRect(rectangle));
} else {
path->addRoundRect(gfx::RectToSkRect(rectangle), kCornerRadius,
kCornerRadius);
}
}
} // namespace
// static
const char ProgressBar::kViewClassName[] = "ProgressBar";
ProgressBar::ProgressBar(int preferred_height, bool allow_round_corner)
: preferred_height_(preferred_height),
allow_round_corner_(allow_round_corner) {
EnableCanvasFlippingForRTLUI(true);
}
ProgressBar::~ProgressBar() {
}
void ProgressBar::GetAccessibleNodeData(ui::AXNodeData* node_data) {
node_data->role = ax::mojom::Role::kProgressIndicator;
}
gfx::Size ProgressBar::CalculatePreferredSize() const {
// The width will typically be ignored.
gfx::Size pref_size(1, preferred_height_);
gfx::Insets insets = GetInsets();
pref_size.Enlarge(insets.width(), insets.height());
return pref_size;
}
const char* ProgressBar::GetClassName() const {
return kViewClassName;
}
void ProgressBar::OnPaint(gfx::Canvas* canvas) {
if (IsIndeterminate())
return OnPaintIndeterminate(canvas);
gfx::Rect content_bounds = GetContentsBounds();
// Draw background.
SkPath background_path;
AddPossiblyRoundRectToPath(content_bounds, allow_round_corner_,
&background_path);
cc::PaintFlags background_flags;
background_flags.setStyle(cc::PaintFlags::kFill_Style);
background_flags.setAntiAlias(true);
background_flags.setColor(GetBackgroundColor());
canvas->DrawPath(background_path, background_flags);
// Draw slice.
SkPath slice_path;
const int slice_width = static_cast<int>(
content_bounds.width() * std::min(current_value_, 1.0) + 0.5);
if (slice_width < 1)
return;
gfx::Rect slice_bounds = content_bounds;
slice_bounds.set_width(slice_width);
AddPossiblyRoundRectToPath(slice_bounds, allow_round_corner_, &slice_path);
cc::PaintFlags slice_flags;
slice_flags.setStyle(cc::PaintFlags::kFill_Style);
slice_flags.setAntiAlias(true);
slice_flags.setColor(GetForegroundColor());
canvas->DrawPath(slice_path, slice_flags);
}
void ProgressBar::SetValue(double value) {
double adjusted_value = (value < 0.0 || value > 1.0) ? -1.0 : value;
if (adjusted_value == current_value_)
return;
current_value_ = adjusted_value;
if (IsIndeterminate()) {
indeterminate_bar_animation_.reset(new gfx::LinearAnimation(this));
indeterminate_bar_animation_->SetDuration(base::TimeDelta::FromSeconds(2));
indeterminate_bar_animation_->Start();
} else {
indeterminate_bar_animation_.reset();
SchedulePaint();
}
}
SkColor ProgressBar::GetForegroundColor() const {
if (foreground_color_)
return foreground_color_.value();
return GetNativeTheme()->GetSystemColor(
ui::NativeTheme::kColorId_ProminentButtonColor);
}
SkColor ProgressBar::GetBackgroundColor() const {
if (background_color_)
return background_color_.value();
return color_utils::BlendTowardOppositeLuma(GetForegroundColor(), 0xCC);
}
void ProgressBar::AnimationProgressed(const gfx::Animation* animation) {
DCHECK_EQ(animation, indeterminate_bar_animation_.get());
DCHECK(IsIndeterminate());
SchedulePaint();
}
void ProgressBar::AnimationEnded(const gfx::Animation* animation) {
DCHECK_EQ(animation, indeterminate_bar_animation_.get());
// Restarts animation.
if (IsIndeterminate())
indeterminate_bar_animation_->Start();
}
bool ProgressBar::IsIndeterminate() {
return current_value_ < 0.0;
}
void ProgressBar::OnPaintIndeterminate(gfx::Canvas* canvas) {
gfx::Rect content_bounds = GetContentsBounds();
// Draw background.
SkPath background_path;
AddPossiblyRoundRectToPath(content_bounds, allow_round_corner_,
&background_path);
cc::PaintFlags background_flags;
background_flags.setStyle(cc::PaintFlags::kFill_Style);
background_flags.setAntiAlias(true);
background_flags.setColor(GetBackgroundColor());
canvas->DrawPath(background_path, background_flags);
// Draw slice.
SkPath slice_path;
double time = indeterminate_bar_animation_->GetCurrentValue();
// The animation spec corresponds to the material design lite's parameter.
// (cf. https://github.com/google/material-design-lite/)
double bar1_left;
double bar1_width;
double bar2_left;
double bar2_width;
if (time < 0.50) {
bar1_left = time / 2;
bar1_width = time * 1.5;
bar2_left = 0;
bar2_width = 0;
} else if (time < 0.75) {
bar1_left = time * 3 - 1.25;
bar1_width = 0.75 - (time - 0.5) * 3;
bar2_left = 0;
bar2_width = time - 0.5;
} else {
bar1_left = 1;
bar1_width = 0;
bar2_left = (time - 0.75) * 4;
bar2_width = 0.25 - (time - 0.75);
}
int bar1_start_x = std::round(content_bounds.width() * bar1_left);
int bar1_end_x = std::round(
content_bounds.width() * std::min(1.0, bar1_left + bar1_width));
int bar2_start_x = std::round(content_bounds.width() * bar2_left);
int bar2_end_x = std::round(
content_bounds.width() * std::min(1.0, bar2_left + bar2_width));
gfx::Rect slice_bounds = content_bounds;
slice_bounds.set_x(content_bounds.x() + bar1_start_x);
slice_bounds.set_width(bar1_end_x - bar1_start_x);
AddPossiblyRoundRectToPath(slice_bounds, allow_round_corner_, &slice_path);
slice_bounds.set_x(content_bounds.x() + bar2_start_x);
slice_bounds.set_width(bar2_end_x - bar2_start_x);
AddPossiblyRoundRectToPath(slice_bounds, allow_round_corner_, &slice_path);
cc::PaintFlags slice_flags;
slice_flags.setStyle(cc::PaintFlags::kFill_Style);
slice_flags.setAntiAlias(true);
slice_flags.setColor(GetForegroundColor());
canvas->DrawPath(slice_path, slice_flags);
}
} // namespace views
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