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// Copyright 2018 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/flex_layout_example.h"
#include <memory>
#include <string>
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/base/models/combobox_model.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/views/border.h"
#include "ui/views/controls/button/checkbox.h"
#include "ui/views/controls/button/md_text_button.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/fill_layout.h"
#include "ui/views/view.h"
#include "ui/views/view_class_properties.h"
namespace views::examples {
FlexLayoutExample::FlexLayoutExample() : LayoutExampleBase("Flex Layout") {}
FlexLayoutExample::~FlexLayoutExample() {
interior_margin_.ResetControllers();
default_child_margins_.ResetControllers();
}
void FlexLayoutExample::ContentsChanged(Textfield* sender,
const std::u16string& new_contents) {
layout_->SetInteriorMargin(
LayoutExampleBase::TextfieldsToInsets(interior_margin_));
layout_->SetDefault(views::kMarginsKey, LayoutExampleBase::TextfieldsToInsets(
default_child_margins_));
RefreshLayoutPanel(false);
}
void FlexLayoutExample::CreateAdditionalControls() {
constexpr auto kOrientationValues =
std::to_array<const char* const>({"Horizontal", "Vertical"});
orientation_ = CreateAndAddCombobox(
u"Orientation", kOrientationValues,
base::BindRepeating(&FlexLayoutExample::OrientationChanged,
base::Unretained(this)));
constexpr auto kMainAxisValues =
std::to_array<const char* const>({"Start", "Center", "End"});
main_axis_alignment_ = CreateAndAddCombobox(
u"Main axis", kMainAxisValues,
base::BindRepeating(&FlexLayoutExample::MainAxisAlignmentChanged,
base::Unretained(this)));
constexpr auto kCrossAxisValues =
std::to_array<const char* const>({"Stretch", "Start", "Center", "End"});
cross_axis_alignment_ = CreateAndAddCombobox(
u"Cross axis", kCrossAxisValues,
base::BindRepeating(&FlexLayoutExample::CrossAxisAlignmentChanged,
base::Unretained(this)));
CreateMarginsTextFields(u"Interior margin", &interior_margin_);
CreateMarginsTextFields(u"Default margins", &default_child_margins_);
collapse_margins_ = CreateAndAddCheckbox(
u"Collapse margins", base::BindRepeating(
[](FlexLayoutExample* example) {
example->layout_->SetCollapseMargins(
example->collapse_margins_->GetChecked());
example->RefreshLayoutPanel(false);
},
base::Unretained(this)));
ignore_default_main_axis_margins_ = CreateAndAddCheckbox(
u"Ignore main axis margins",
base::BindRepeating(
[](FlexLayoutExample* example) {
example->layout_->SetIgnoreDefaultMainAxisMargins(
example->ignore_default_main_axis_margins_->GetChecked());
example->RefreshLayoutPanel(false);
},
base::Unretained(this)));
layout_ = layout_panel()->SetLayoutManager(std::make_unique<FlexLayout>());
}
void FlexLayoutExample::UpdateLayoutManager() {
for (View* child : layout_panel()->children()) {
const int flex = static_cast<ChildPanel*>(child)->GetFlex();
if (flex < 0) {
child->ClearProperty(views::kFlexBehaviorKey);
} else {
child->SetProperty(views::kFlexBehaviorKey, GetFlexSpecification(flex));
}
}
}
FlexSpecification FlexLayoutExample::GetFlexSpecification(int weight) const {
return weight > 0
? FlexSpecification(MinimumFlexSizeRule::kScaleToZero,
MaximumFlexSizeRule::kUnbounded)
.WithWeight(weight)
: FlexSpecification(MinimumFlexSizeRule::kPreferredSnapToZero,
MaximumFlexSizeRule::kPreferred)
.WithWeight(0);
}
void FlexLayoutExample::OrientationChanged() {
constexpr auto kOrientations = std::to_array<LayoutOrientation>(
{LayoutOrientation::kHorizontal, LayoutOrientation::kVertical});
layout_->SetOrientation(
kOrientations[orientation_->GetSelectedIndex().value()]);
RefreshLayoutPanel(false);
}
void FlexLayoutExample::MainAxisAlignmentChanged() {
constexpr auto kMainAxisAlignments = std::to_array<LayoutAlignment>(
{LayoutAlignment::kStart, LayoutAlignment::kCenter,
LayoutAlignment::kEnd});
layout_->SetMainAxisAlignment(
kMainAxisAlignments[main_axis_alignment_->GetSelectedIndex().value()]);
RefreshLayoutPanel(false);
}
void FlexLayoutExample::CrossAxisAlignmentChanged() {
constexpr auto kCrossAxisAlignments = std::to_array<LayoutAlignment>(
{LayoutAlignment::kStretch, LayoutAlignment::kStart,
LayoutAlignment::kCenter, LayoutAlignment::kEnd});
layout_->SetCrossAxisAlignment(
kCrossAxisAlignments[cross_axis_alignment_->GetSelectedIndex().value()]);
RefreshLayoutPanel(false);
}
} // namespace views::examples
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