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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/examples/label_example.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/vector2d.h"
#include "ui/views/background.h"
#include "ui/views/border.h"
#include "ui/views/controls/button/checkbox.h"
#include "ui/views/controls/combobox/combobox.h"
#include "ui/views/controls/label.h"
#include "ui/views/controls/textfield/textfield.h"
#include "ui/views/examples/example_combobox_model.h"
#include "ui/views/layout/box_layout.h"
#include "ui/views/layout/grid_layout.h"
#include "ui/views/view.h"
using base::ASCIIToUTF16;
using base::WideToUTF16;
namespace views {
namespace examples {
namespace {
const char* kAlignments[] = { "Left", "Center", "Right", "Head" };
// A Label with a clamped preferred width to demonstrate eliding or wrapping.
class ExamplePreferredSizeLabel : public Label {
public:
ExamplePreferredSizeLabel() : Label() {
SetBorder(CreateSolidBorder(1, SK_ColorGRAY));
}
~ExamplePreferredSizeLabel() override {}
// Label:
gfx::Size CalculatePreferredSize() const override {
return gfx::Size(50, Label::CalculatePreferredSize().height());
}
static const char* kElideBehaviors[];
private:
DISALLOW_COPY_AND_ASSIGN(ExamplePreferredSizeLabel);
};
// static
const char* ExamplePreferredSizeLabel::kElideBehaviors[] = {
"No Elide", "Truncate", "Elide Head", "Elide Middle",
"Elide Tail", "Elide Email", "Fade Tail"};
} // namespace
LabelExample::LabelExample()
: ExampleBase("Label"),
textfield_(NULL),
alignment_(NULL),
elide_behavior_(NULL),
multiline_(NULL),
shadows_(NULL),
custom_label_(NULL) {
}
LabelExample::~LabelExample() {
// Remove the views first as some reference combobox models.
container()->RemoveAllChildViews(true);
}
void LabelExample::CreateExampleView(View* container) {
// A very simple label example, followed by additional helpful examples.
container->SetLayoutManager(
std::make_unique<BoxLayout>(BoxLayout::kVertical, gfx::Insets(), 10));
Label* label = new Label(ASCIIToUTF16("Hello world!"));
container->AddChildView(label);
const wchar_t hello_world_hebrew[] =
L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd!";
label = new Label(WideToUTF16(hello_world_hebrew));
label->SetHorizontalAlignment(gfx::ALIGN_RIGHT);
container->AddChildView(label);
label = new Label(WideToUTF16(L"A UTF16 surrogate pair: \x5d0\x5b0"));
label->SetHorizontalAlignment(gfx::ALIGN_RIGHT);
container->AddChildView(label);
label = new Label(ASCIIToUTF16("A left-aligned blue label."));
label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
label->SetEnabledColor(SK_ColorBLUE);
container->AddChildView(label);
label = new Label(WideToUTF16(L"Password!"));
label->SetObscured(true);
container->AddChildView(label);
label = new Label(ASCIIToUTF16("A Courier-18 label with shadows."));
label->SetFontList(gfx::FontList("Courier, 18px"));
gfx::ShadowValues shadows(1,
gfx::ShadowValue(gfx::Vector2d(), 1, SK_ColorRED));
gfx::ShadowValue shadow(gfx::Vector2d(2, 2), 0, SK_ColorGRAY);
shadows.push_back(shadow);
label->SetShadows(shadows);
container->AddChildView(label);
label = new ExamplePreferredSizeLabel();
label->SetText(ASCIIToUTF16("A long label will elide toward its logical end "
"if the text's width exceeds the label's available width."));
container->AddChildView(label);
label = new ExamplePreferredSizeLabel();
label->SetText(ASCIIToUTF16("A multi-line label will wrap onto subsequent "
"lines if the text's width exceeds the label's available width, which is "
"helpful for extemely long text used to demonstrate line wrapping."));
label->SetMultiLine(true);
container->AddChildView(label);
label = new Label(ASCIIToUTF16("Label with thick border"));
label->SetBorder(CreateSolidBorder(20, SK_ColorRED));
container->AddChildView(label);
label = new Label(
ASCIIToUTF16("A multiline label...\n\n...which supports text selection"));
label->SetSelectable(true);
label->SetMultiLine(true);
container->AddChildView(label);
AddCustomLabel(container);
}
void LabelExample::ButtonPressed(Button* button, const ui::Event& event) {
if (button == multiline_) {
custom_label_->SetMultiLine(multiline_->checked());
} else if (button == shadows_) {
gfx::ShadowValues shadows;
if (shadows_->checked()) {
shadows.push_back(gfx::ShadowValue(gfx::Vector2d(), 1, SK_ColorRED));
shadows.push_back(gfx::ShadowValue(gfx::Vector2d(2, 2), 0, SK_ColorGRAY));
}
custom_label_->SetShadows(shadows);
} else if (button == selectable_) {
custom_label_->SetSelectable(selectable_->checked());
}
custom_label_->parent()->parent()->Layout();
custom_label_->SchedulePaint();
}
void LabelExample::OnPerformAction(Combobox* combobox) {
if (combobox == alignment_) {
custom_label_->SetHorizontalAlignment(
static_cast<gfx::HorizontalAlignment>(combobox->selected_index()));
} else if (combobox == elide_behavior_) {
custom_label_->SetElideBehavior(
static_cast<gfx::ElideBehavior>(combobox->selected_index()));
}
}
void LabelExample::ContentsChanged(Textfield* sender,
const base::string16& new_contents) {
custom_label_->SetText(new_contents);
custom_label_->parent()->parent()->Layout();
}
void LabelExample::AddCustomLabel(View* container) {
View* control_container = new View();
control_container->SetBorder(CreateSolidBorder(2, SK_ColorGRAY));
control_container->SetBackground(CreateSolidBackground(SK_ColorLTGRAY));
GridLayout* layout = control_container->SetLayoutManager(
std::make_unique<views::GridLayout>(control_container));
ColumnSet* column_set = layout->AddColumnSet(0);
column_set->AddColumn(GridLayout::LEADING, GridLayout::FILL,
0.0f, GridLayout::USE_PREF, 0, 0);
column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
1.0f, GridLayout::USE_PREF, 0, 0);
layout->StartRow(0, 0);
layout->AddView(new Label(ASCIIToUTF16("Content: ")));
textfield_ = new Textfield();
textfield_->SetText(ASCIIToUTF16("Use the provided controls to configure the "
"content and presentation of this custom label."));
textfield_->SetSelectionRange(gfx::Range());
textfield_->set_controller(this);
layout->AddView(textfield_);
alignment_ = AddCombobox(layout, "Alignment: ", kAlignments,
arraysize(kAlignments));
elide_behavior_ = AddCombobox(
layout, "Elide Behavior: ", ExamplePreferredSizeLabel::kElideBehaviors,
arraysize(ExamplePreferredSizeLabel::kElideBehaviors));
column_set = layout->AddColumnSet(1);
column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING,
0, GridLayout::USE_PREF, 0, 0);
column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING,
0, GridLayout::USE_PREF, 0, 0);
column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING, 0,
GridLayout::USE_PREF, 0, 0);
layout->StartRow(0, 1);
multiline_ = new Checkbox(base::ASCIIToUTF16("Multiline"));
multiline_->set_listener(this);
layout->AddView(multiline_);
shadows_ = new Checkbox(base::ASCIIToUTF16("Shadows"));
shadows_->set_listener(this);
layout->AddView(shadows_);
selectable_ = new Checkbox(base::ASCIIToUTF16("Selectable"));
selectable_->set_listener(this);
layout->AddView(selectable_);
layout->AddPaddingRow(0, 8);
column_set = layout->AddColumnSet(2);
column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
1, GridLayout::USE_PREF, 0, 0);
layout->StartRow(0, 2);
custom_label_ = new ExamplePreferredSizeLabel();
custom_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
custom_label_->SetElideBehavior(gfx::NO_ELIDE);
custom_label_->SetText(textfield_->text());
layout->AddView(custom_label_);
// Disable the text selection checkbox if |custom_label_| does not support
// text selection.
selectable_->SetEnabled(custom_label_->IsSelectionSupported());
container->AddChildView(control_container);
}
Combobox* LabelExample::AddCombobox(GridLayout* layout,
const char* name,
const char** strings,
int count) {
layout->StartRow(0, 0);
layout->AddView(new Label(base::ASCIIToUTF16(name)));
ExampleComboboxModel* model = new ExampleComboboxModel(strings, count);
example_combobox_models_.push_back(base::WrapUnique(model));
Combobox* combobox = new Combobox(model);
combobox->SetSelectedIndex(0);
combobox->set_listener(this);
layout->AddView(combobox);
return combobox;
}
} // namespace examples
} // namespace views
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