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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/examples/scroll_view_example.h"
#include <memory>
#include <utility>
#include "base/strings/utf_string_conversions.h"
#include "cc/paint/paint_flags.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/color/color_provider.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_palette.h"
#include "ui/gfx/color_utils.h"
#include "ui/gfx/skia_paint_util.h"
#include "ui/views/background.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/controls/button/radio_button.h"
#include "ui/views/examples/examples_color_id.h"
#include "ui/views/examples/grit/views_examples_resources.h"
#include "ui/views/layout/box_layout_view.h"
#include "ui/views/layout/flex_layout.h"
#include "ui/views/layout/flex_layout_types.h"
#include "ui/views/view.h"
#include "ui/views/view_class_properties.h"
using l10n_util::GetStringUTF16;
using l10n_util::GetStringUTF8;
namespace views::examples {
// ScrollView's content, which draws gradient color on background.
// TODO(oshima): add child views as well.
class ScrollViewExample::ScrollableView : public BoxLayoutView {
public:
ScrollableView() {
SetColor(ExamplesColorIds::kColorScrollViewExampleTallFrom,
ExamplesColorIds::kColorScrollViewExampleTallTo);
SetOrientation(views::BoxLayout::Orientation::kVertical);
SetInsideBorderInsets(gfx::Insets());
SetBetweenChildSpacing(0);
const auto add_child = [this](std::unique_ptr<View> view) {
auto* container = AddChildView(std::make_unique<BoxLayoutView>());
container->SetOrientation(views::BoxLayout::Orientation::kVertical);
container->AddChildView(std::move(view));
};
add_child(std::make_unique<LabelButton>(
Button::PressedCallback(),
GetStringUTF16(IDS_SCROLL_VIEW_BUTTON_LABEL)));
add_child(std::make_unique<RadioButton>(
GetStringUTF16(IDS_SCROLL_VIEW_RADIO_BUTTON_LABEL), 0));
SetDefaultFlex(1);
}
ScrollableView(const ScrollableView&) = delete;
ScrollableView& operator=(const ScrollableView&) = delete;
void SetColor(ui::ColorId from_id, ui::ColorId to_id) {
from_color_id_ = from_id;
to_color_id_ = to_id;
}
std::pair<SkColor, SkColor> GetColors() const {
auto* const cp = GetColorProvider();
if (!cp) {
return {gfx::kPlaceholderColor, gfx::kPlaceholderColor};
}
return {cp->GetColor(from_color_id_), cp->GetColor(to_color_id_)};
}
void OnPaintBackground(gfx::Canvas* canvas) override {
cc::PaintFlags flags;
std::pair<SkColor, SkColor> gradient_colors = GetColors();
flags.setShader(gfx::CreateGradientShader(
gfx::Point(), gfx::Point(0, height()), gradient_colors.first,
gradient_colors.second));
flags.setStyle(cc::PaintFlags::kFill_Style);
canvas->DrawRect(GetLocalBounds(), flags);
}
private:
ui::ColorId from_color_id_;
ui::ColorId to_color_id_;
};
ScrollViewExample::ScrollViewExample()
: ExampleBase(GetStringUTF8(IDS_SCROLL_VIEW_SELECT_LABEL).c_str()) {}
ScrollViewExample::~ScrollViewExample() = default;
void ScrollViewExample::CreateExampleView(View* container) {
auto scroll_view = std::make_unique<ScrollView>();
scrollable_ = scroll_view->SetContents(std::make_unique<ScrollableView>());
scrollable_->SetBounds(0, 0, 1000, 100);
scrollable_->SetColor(ExamplesColorIds::kColorScrollViewExampleWideFrom,
ExamplesColorIds::kColorScrollViewExampleWideTo);
container->SetLayoutManager(std::make_unique<FlexLayout>())
->SetOrientation(LayoutOrientation::kVertical);
auto full_flex = FlexSpecification(MinimumFlexSizeRule::kScaleToZero,
MaximumFlexSizeRule::kUnbounded)
.WithWeight(1);
// Add scroll view.
scroll_view_ = container->AddChildView(std::move(scroll_view));
scroll_view_->SetProperty(views::kFlexBehaviorKey, full_flex);
// Add control buttons.
auto* button_panel = container->AddChildView(std::make_unique<View>());
button_panel->SetLayoutManager(std::make_unique<FlexLayout>())
->SetOrientation(LayoutOrientation::kHorizontal);
button_panel->AddChildView(std::make_unique<LabelButton>(
base::BindRepeating(&ScrollViewExample::ButtonPressed,
base::Unretained(this), gfx::Rect(0, 0, 1000, 100),
ExamplesColorIds::kColorScrollViewExampleWideFrom,
ExamplesColorIds::kColorScrollViewExampleWideTo),
GetStringUTF16(IDS_SCROLL_VIEW_WIDE_LABEL)));
button_panel->AddChildView(std::make_unique<LabelButton>(
base::BindRepeating(&ScrollViewExample::ButtonPressed,
base::Unretained(this), gfx::Rect(0, 0, 100, 1000),
ExamplesColorIds::kColorScrollViewExampleTallFrom,
ExamplesColorIds::kColorScrollViewExampleTallTo),
GetStringUTF16(IDS_SCROLL_VIEW_TALL_LABEL)));
button_panel->AddChildView(std::make_unique<LabelButton>(
base::BindRepeating(
&ScrollViewExample::ButtonPressed, base::Unretained(this),
gfx::Rect(0, 0, 1000, 1000),
ExamplesColorIds::kColorScrollViewExampleBigSquareFrom,
ExamplesColorIds::kColorScrollViewExampleBigSquareTo),
GetStringUTF16(IDS_SCROLL_VIEW_BIG_SQUARE_LABEL)));
button_panel->AddChildView(std::make_unique<LabelButton>(
base::BindRepeating(
&ScrollViewExample::ButtonPressed, base::Unretained(this),
gfx::Rect(0, 0, 100, 100),
ExamplesColorIds::kColorScrollViewExampleSmallSquareFrom,
ExamplesColorIds::kColorScrollViewExampleSmallSquareTo),
GetStringUTF16(IDS_SCROLL_VIEW_SMALL_SQUARE_LABEL)));
button_panel->AddChildView(std::make_unique<LabelButton>(
base::BindRepeating(&View::ScrollRectToVisible,
base::Unretained(scroll_view_->contents()),
gfx::Rect(20, 500, 1000, 500)),
GetStringUTF16(IDS_SCROLL_VIEW_SCROLL_TO_LABEL)));
for (View* child : button_panel->children()) {
child->SetProperty(views::kFlexBehaviorKey, full_flex);
}
}
void ScrollViewExample::ButtonPressed(gfx::Rect bounds,
ui::ColorId from,
ui::ColorId to) {
scrollable_->SetBoundsRect(std::move(bounds));
scrollable_->SetColor(from, to);
}
} // namespace views::examples
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