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// Copyright 2013 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/examples/multiline_example.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/events/event.h"
#include "ui/gfx/render_text.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/layout/grid_layout.h"
#include "ui/views/view.h"
using base::ASCIIToUTF16;
namespace views {
namespace 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 {
public:
PreferredSizeLabel() : Label() {}
~PreferredSizeLabel() override {}
// Label:
gfx::Size GetPreferredSize() const override {
return gfx::Size(50, Label::GetPreferredSize().height());
}
private:
DISALLOW_COPY_AND_ASSIGN(PreferredSizeLabel);
};
} // namespace
// A simple View that hosts a RenderText object.
class MultilineExample::RenderTextView : public View {
public:
RenderTextView() : render_text_(gfx::RenderText::CreateInstanceForEditing()) {
render_text_->SetHorizontalAlignment(gfx::ALIGN_TO_HEAD);
render_text_->SetColor(SK_ColorBLACK);
render_text_->SetMultiline(true);
SetBorder(Border::CreateSolidBorder(2, SK_ColorGRAY));
}
void OnPaint(gfx::Canvas* canvas) override {
View::OnPaint(canvas);
render_text_->Draw(canvas);
}
gfx::Size GetPreferredSize() const override {
// 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;
}
int GetHeightForWidth(int w) const override {
// TODO(ckocagil): Why does this happen?
if (w == 0)
return View::GetHeightForWidth(w);
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 height;
}
void SetText(const base::string16& 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 color_range = ClampRange(gfx::Range(1, 21), range_max);
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_->SetColor(SK_ColorBLACK);
render_text_->ApplyColor(0xFFFF0000, color_range);
render_text_->SetStyle(gfx::DIAGONAL_STRIKE, false);
render_text_->ApplyStyle(gfx::DIAGONAL_STRIKE, true, color_range);
render_text_->SetStyle(gfx::UNDERLINE, false);
render_text_->ApplyStyle(gfx::UNDERLINE, true, color_range);
render_text_->ApplyStyle(gfx::BOLD, true, bold_range);
render_text_->ApplyStyle(gfx::ITALIC, true, italic_range);
InvalidateLayout();
}
private:
void OnBoundsChanged(const gfx::Rect& previous_bounds) override {
gfx::Rect bounds = GetLocalBounds();
bounds.Inset(GetInsets());
render_text_->SetDisplayRect(bounds);
}
scoped_ptr<gfx::RenderText> render_text_;
DISALLOW_COPY_AND_ASSIGN(RenderTextView);
};
MultilineExample::MultilineExample()
: ExampleBase("Multiline RenderText"),
render_text_view_(NULL),
label_(NULL),
textfield_(NULL),
label_checkbox_(NULL) {
}
MultilineExample::~MultilineExample() {
}
void MultilineExample::CreateExampleView(View* container) {
const base::string16 kTestString = base::WideToUTF16(L"qwerty"
L"\x627\x644\x631\x626\x64A\x633\x64A\x629"
L"asdfgh");
render_text_view_ = new RenderTextView();
render_text_view_->SetText(kTestString);
label_ = new PreferredSizeLabel();
label_->SetText(kTestString);
label_->SetMultiLine(true);
label_->SetBorder(Border::CreateSolidBorder(2, SK_ColorCYAN));
label_checkbox_ = new Checkbox(ASCIIToUTF16("views::Label:"));
label_checkbox_->SetChecked(true);
label_checkbox_->set_listener(this);
label_checkbox_->set_request_focus_on_press(false);
textfield_ = new Textfield();
textfield_->set_controller(this);
textfield_->SetText(kTestString);
GridLayout* layout = new GridLayout(container);
container->SetLayoutManager(layout);
ColumnSet* column_set = layout->AddColumnSet(0);
column_set->AddColumn(GridLayout::LEADING, GridLayout::CENTER,
0.0f, GridLayout::USE_PREF, 0, 0);
column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
1.0f, GridLayout::FIXED, 0, 0);
layout->StartRow(0, 0);
layout->AddView(new Label(ASCIIToUTF16("gfx::RenderText:")));
layout->AddView(render_text_view_);
layout->StartRow(0, 0);
layout->AddView(label_checkbox_);
layout->AddView(label_);
layout->StartRow(0, 0);
layout->AddView(new Label(ASCIIToUTF16("Sample Text:")));
layout->AddView(textfield_);
}
void MultilineExample::ContentsChanged(Textfield* sender,
const base::string16& new_contents) {
render_text_view_->SetText(new_contents);
if (label_checkbox_->checked())
label_->SetText(new_contents);
container()->Layout();
container()->SchedulePaint();
}
void MultilineExample::ButtonPressed(Button* sender, const ui::Event& event) {
DCHECK_EQ(sender, label_checkbox_);
label_->SetText(label_checkbox_->checked() ? textfield_->text() :
base::string16());
container()->Layout();
container()->SchedulePaint();
}
} // namespace examples
} // namespace views
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