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// Copyright (c) 2010 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.
#ifndef VIEWS_EXAMPLES_WIDGET_EXAMPLE_H_
#define VIEWS_EXAMPLES_WIDGET_EXAMPLE_H_
#include "views/background.h"
#include "views/box_layout.h"
#include "views/controls/button/text_button.h"
#include "views/examples/example_base.h"
#include "views/view.h"
#include "views/widget/root_view.h"
#include "views/widget/widget.h"
#if defined(OS_LINUX)
#include "views/widget/widget_gtk.h"
#endif
namespace {
// A layout manager that layouts a single child at
// the center of the host view.
class CenterLayout : public views::LayoutManager {
public:
CenterLayout() {}
virtual ~CenterLayout() {}
// Overridden from LayoutManager:
virtual void Layout(views::View* host) {
views::View* child = host->GetChildViewAt(0);
gfx::Size size = child->GetPreferredSize();
child->SetBounds((host->width() - size.width()) / 2,
(host->height() - size.height()) / 2,
size.width(), size.height());
}
virtual gfx::Size GetPreferredSize(views::View* host) {
return host->GetPreferredSize();
}
private:
DISALLOW_COPY_AND_ASSIGN(CenterLayout);
};
} // namespace
namespace examples {
using views::Widget;
// WidgetExample demonstrates how to create a popup widget.
class WidgetExample : public ExampleBase, public views::ButtonListener {
public:
explicit WidgetExample(ExamplesMain* main) : ExampleBase(main) {}
virtual ~WidgetExample() {}
virtual std::wstring GetExampleTitle() { return L"Widget"; }
virtual void CreateExampleView(views::View* container) {
container->SetLayoutManager(
new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 2));
BuildButton(container, L"Create a popup widget", POPUP);
BuildButton(container, L"Create a transparent popup widget",
TRANSPARENT_POPUP);
#if defined(OS_LINUX)
views::View* vert_container = new views::View();
container->AddChildView(vert_container);
vert_container->SetLayoutManager(
new views::BoxLayout(views::BoxLayout::kVertical, 0, 20));
BuildButton(vert_container, L"Create a child widget", CHILD);
BuildButton(vert_container, L"Create a transparent child widget",
TRANSPARENT_CHILD);
#endif
}
private:
enum Command {
POPUP,
CHILD,
TRANSPARENT_POPUP,
TRANSPARENT_CHILD,
CLOSE_WIDGET,
};
void BuildButton(views::View* container, const std::wstring& label, int tag) {
views::TextButton* button = new views::TextButton(this, label);
button->set_tag(tag);
container->AddChildView(button);
}
void InitWidget(Widget* widget,
const Widget::TransparencyParam transparency) {
// Add view/native buttons to close the popup widget.
views::TextButton* close_button = new views::TextButton(this, L"Close");
close_button->set_tag(CLOSE_WIDGET);
// TODO(oshima): support transparent native view.
views::NativeButton* native_button
= new views::NativeButton(this, L"Native Close");
native_button->set_tag(CLOSE_WIDGET);
views::View* button_container = new views::View();
button_container->SetLayoutManager(
new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 1));
button_container->AddChildView(close_button);
button_container->AddChildView(native_button);
views::View* widget_container = new views::View();
widget_container->SetLayoutManager(new CenterLayout);
widget_container->AddChildView(button_container);
widget->SetContentsView(widget_container);
if (transparency != Widget::Transparent) {
widget_container->set_background(
views::Background::CreateStandardPanelBackground());
}
// Show the widget.
widget->Show();
}
#if defined(OS_LINUX)
void CreateChild(views::View* parent,
const Widget::TransparencyParam transparency) {
views::WidgetGtk* widget =
new views::WidgetGtk(views::WidgetGtk::TYPE_CHILD);
if (transparency == Widget::Transparent)
widget->MakeTransparent();
// Compute where to place the child widget.
// We'll place it at the center of the root widget.
views::Widget* parent_widget = parent->GetWidget();
gfx::Rect bounds;
parent_widget->GetBounds(&bounds, false);
// Child widget is 200x200 square.
bounds.SetRect((bounds.width() - 200) / 2, (bounds.height() - 200) / 2,
200, 200);
// Initialize the child widget with the computed bounds.
widget->InitWithWidget(parent_widget, bounds);
InitWidget(widget, transparency);
}
#endif
void CreatePopup(views::View* parent,
const Widget::TransparencyParam transparency) {
Widget* widget = Widget::CreatePopupWidget(transparency,
Widget::AcceptEvents,
Widget::DeleteOnDestroy,
Widget::MirrorOriginInRTL);
// Compute where to place the popup widget.
// We'll place it right below the create button.
gfx::Point point = parent->GetPosition();
// The position in point is relative to the parent. Make it absolute.
views::View::ConvertPointToScreen(parent, &point);
// Add the height of create_button_.
point.Offset(0, parent->size().height());
gfx::Rect bounds(point.x(), point.y(), 200, 300);
// Initialize the popup widget with the computed bounds.
widget->InitWithWidget(parent->GetWidget(), bounds);
InitWidget(widget, transparency);
}
// ButtonListner implementation.
virtual void ButtonPressed(views::Button* sender, const views::Event& event) {
switch (sender->tag()) {
case POPUP:
CreatePopup(sender, Widget::NotTransparent);
break;
case TRANSPARENT_POPUP:
CreatePopup(sender, Widget::Transparent);
break;
#if defined(OS_LINUX)
case CHILD:
CreateChild(sender, Widget::NotTransparent);
break;
case TRANSPARENT_CHILD:
CreateChild(sender, Widget::Transparent);
break;
#endif
case CLOSE_WIDGET:
sender->GetWidget()->Close();
break;
}
}
DISALLOW_COPY_AND_ASSIGN(WidgetExample);
};
} // namespace examples
#endif // VIEWS_EXAMPLES_WIDGET_EXAMPLE_H_
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