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// Copyright (c) 2011 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/example_base.h"
#include <stdarg.h>
#include "base/compiler_specific.h"
#include "base/stringprintf.h"
#include "ui/views/examples/examples_window.h"
#include "ui/views/view.h"
namespace views {
namespace examples {
// Logs the specified string to the status area of the examples window.
// This function can only be called if there is a visible examples window.
void LogStatus(const std::string& status);
namespace {
// Some of GTK based view classes require NativeWidgetGtk in the view
// parent chain. This class is used to defer the creation of such
// views until a NativeWidgetGtk is added to the view hierarchy.
class ContainerView : public View {
public:
explicit ContainerView(examples::ExampleBase* base)
: example_view_created_(false),
example_base_(base) {
}
private:
// Overridden from View:
virtual void ViewHierarchyChanged(bool is_add,
View* parent,
View* child) OVERRIDE {
View::ViewHierarchyChanged(is_add, parent, child);
// We're not using child == this because a Widget may not be
// available when this is added to the hierarchy.
if (is_add && GetWidget() && !example_view_created_) {
example_view_created_ = true;
example_base_->CreateExampleView(this);
}
}
// True if the example view has already been created, or false otherwise.
bool example_view_created_;
examples::ExampleBase* example_base_;
DISALLOW_COPY_AND_ASSIGN(ContainerView);
};
} // namespace
ExampleBase::~ExampleBase() {}
ExampleBase::ExampleBase(const char* title) : example_title_(title) {
container_ = new ContainerView(this);
}
// Prints a message in the status area, at the bottom of the window.
void ExampleBase::PrintStatus(const char* format, ...) {
va_list ap;
va_start(ap, format);
std::string msg;
base::StringAppendV(&msg, format, ap);
LogStatus(msg);
}
} // namespace examples
} // namespace views
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