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// Copyright 2013 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/multiline_example.h"
#include <stddef.h>
#include <algorithm>
#include <memory>
#include <string>
#include <utility>
#include "third_party/skia/include/core/SkColor.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/events/event.h"
#include "ui/gfx/range/range.h"
#include "ui/gfx/render_text.h"
#include "ui/views/accessibility/view_accessibility.h"
#include "ui/views/background.h"
#include "ui/views/border.h"
#include "ui/views/controls/button/checkbox.h"
#include "ui/views/controls/label.h"
#include "ui/views/controls/textfield/textfield.h"
#include "ui/views/examples/examples_color_id.h"
#include "ui/views/examples/grit/views_examples_resources.h"
#include "ui/views/layout/table_layout.h"
#include "ui/views/view.h"
using l10n_util::GetStringUTF16;
using l10n_util::GetStringUTF8;
namespace views::examples {
namespace {
gfx::Range ClampRange(gfx::Range range, size_t max) {
range.set_start(std::min(range.start(), max));
range.set_end(std::min(range.end(), max));
return range;
}
// A Label with a clamped preferred width to demonstrate wrapping.
class PreferredSizeLabel : public Label {
METADATA_HEADER(PreferredSizeLabel, Label)
public:
PreferredSizeLabel() = default;
PreferredSizeLabel(const PreferredSizeLabel&) = delete;
PreferredSizeLabel& operator=(const PreferredSizeLabel&) = delete;
~PreferredSizeLabel() override = default;
// Label:
gfx::Size CalculatePreferredSize(
const SizeBounds& available_size) const override {
return gfx::Size(50,
Label::CalculatePreferredSize(available_size).height());
}
};
BEGIN_METADATA(PreferredSizeLabel)
END_METADATA
} // namespace
// A simple View that hosts a RenderText object.
class MultilineExample::RenderTextView : public View {
METADATA_HEADER(RenderTextView, View)
public:
RenderTextView() : render_text_(gfx::RenderText::CreateRenderText()) {
render_text_->SetHorizontalAlignment(gfx::ALIGN_TO_HEAD);
render_text_->SetMultiline(true);
SetBorder(
CreateSolidBorder(2, ExamplesColorIds::kColorMultilineExampleBorder));
}
RenderTextView(const RenderTextView&) = delete;
RenderTextView& operator=(const RenderTextView&) = delete;
void OnPaint(gfx::Canvas* canvas) override {
View::OnPaint(canvas);
render_text_->Draw(canvas);
}
gfx::Size CalculatePreferredSize(
const SizeBounds& available_size) const override {
int w = available_size.width().value_or(0);
if (w == 0) {
// Turn off multiline mode to get the single-line text size, which is the
// preferred size for this view.
render_text_->SetMultiline(false);
gfx::Size size(render_text_->GetContentWidth(),
render_text_->GetStringSize().height());
size.Enlarge(GetInsets().width(), GetInsets().height());
render_text_->SetMultiline(true);
return size;
}
const gfx::Rect old_rect = render_text_->display_rect();
gfx::Rect rect = old_rect;
rect.set_width(w - GetInsets().width());
render_text_->SetDisplayRect(rect);
int height = render_text_->GetStringSize().height() + GetInsets().height();
render_text_->SetDisplayRect(old_rect);
return gfx::Size(w, height);
}
void OnThemeChanged() override {
View::OnThemeChanged();
UpdateColors();
}
void SetText(const std::u16string& new_contents) {
// Color and style the text inside |test_range| to test colors and styles.
const size_t range_max = new_contents.length();
gfx::Range bold_range = ClampRange(gfx::Range(4, 10), range_max);
gfx::Range italic_range = ClampRange(gfx::Range(7, 13), range_max);
render_text_->SetText(new_contents);
render_text_->SetStyle(gfx::TEXT_STYLE_UNDERLINE, false);
render_text_->SetStyle(gfx::TEXT_STYLE_STRIKE, false);
render_text_->ApplyStyle(gfx::TEXT_STYLE_ITALIC, true, italic_range);
render_text_->ApplyWeight(gfx::Font::Weight::BOLD, bold_range);
UpdateColors();
InvalidateLayout();
}
void SetMaxLines(int max_lines) {
render_text_->SetMaxLines(max_lines);
render_text_->SetElideBehavior(max_lines ? gfx::ELIDE_TAIL : gfx::NO_ELIDE);
}
private:
void OnBoundsChanged(const gfx::Rect& previous_bounds) override {
render_text_->SetDisplayRect(GetContentsBounds());
}
void UpdateColors() {
const auto* cp = GetColorProvider();
if (!cp) {
return;
}
render_text_->SetColor(
cp->GetColor(ExamplesColorIds::kColorMultilineExampleForeground));
render_text_->set_selection_color(cp->GetColor(
ExamplesColorIds::kColorMultilineExampleSelectionForeground));
render_text_->set_selection_background_focused_color(cp->GetColor(
ExamplesColorIds::kColorMultilineExampleSelectionBackground));
const size_t range_max = render_text_->text().length();
gfx::Range color_range = ClampRange(gfx::Range(1, 21), range_max);
render_text_->ApplyColor(
cp->GetColor(ExamplesColorIds::kColorMultilineExampleColorRange),
color_range);
render_text_->ApplyStyle(gfx::TEXT_STYLE_UNDERLINE, true, color_range);
}
std::unique_ptr<gfx::RenderText> render_text_;
};
BEGIN_METADATA(MultilineExample, RenderTextView)
END_METADATA
MultilineExample::MultilineExample()
: ExampleBase(GetStringUTF8(IDS_MULTILINE_SELECT_LABEL).c_str()) {}
MultilineExample::~MultilineExample() {
if (textfield_) {
textfield_->set_controller(nullptr);
}
}
void MultilineExample::CreateExampleView(View* container) {
container->SetLayoutManager(std::make_unique<views::TableLayout>())
->AddColumn(LayoutAlignment::kStart, LayoutAlignment::kCenter,
TableLayout::kFixedSize,
TableLayout::ColumnSize::kUsePreferred, 0, 0)
.AddColumn(LayoutAlignment::kStretch, LayoutAlignment::kStretch, 1.0f,
TableLayout::ColumnSize::kFixed, 0, 0)
.AddRows(4, TableLayout::kFixedSize);
const std::u16string kTestString = u"qwertyالرئيسيةasdfgh";
container->AddChildView(
std::make_unique<Label>(GetStringUTF16(IDS_MULTILINE_RENDER_TEXT_LABEL)));
render_text_view_ =
container->AddChildView(std::make_unique<RenderTextView>());
render_text_view_->SetText(kTestString);
label_checkbox_ = container->AddChildView(std::make_unique<Checkbox>(
GetStringUTF16(IDS_MULTILINE_LABEL),
base::BindRepeating(
[](MultilineExample* example) {
example->label_->SetText(example->label_checkbox_->GetChecked()
? example->textfield_->GetText()
: std::u16string());
},
base::Unretained(this))));
label_checkbox_->SetChecked(true);
label_checkbox_->SetRequestFocusOnPress(false);
label_ = container->AddChildView(std::make_unique<PreferredSizeLabel>());
label_->SetText(kTestString);
label_->SetMultiLine(true);
label_->SetBorder(CreateSolidBorder(
2, ExamplesColorIds::kColorMultilineExampleLabelBorder));
elision_checkbox_ = container->AddChildView(std::make_unique<Checkbox>(
GetStringUTF16(IDS_MULTILINE_ELIDE_LABEL),
base::BindRepeating(
[](MultilineExample* example) {
example->render_text_view_->SetMaxLines(
example->elision_checkbox_->GetChecked() ? 3 : 0);
},
base::Unretained(this))));
elision_checkbox_->SetChecked(false);
elision_checkbox_->SetRequestFocusOnPress(false);
container->AddChildView(std::make_unique<View>());
auto* label = container->AddChildView(
std::make_unique<Label>(GetStringUTF16(IDS_MULTILINE_SAMPLE_TEXT_LABEL)));
textfield_ = container->AddChildView(std::make_unique<Textfield>());
textfield_->set_controller(this);
textfield_->SetText(kTestString);
textfield_->GetViewAccessibility().SetName(*label);
}
void MultilineExample::ContentsChanged(Textfield* sender,
const std::u16string& new_contents) {
render_text_view_->SetText(new_contents);
if (label_checkbox_->GetChecked()) {
label_->SetText(new_contents);
}
example_view()->InvalidateLayout();
example_view()->SchedulePaint();
}
} // namespace views::examples
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