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// Copyright (c) 2009 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_CONTROLS_NATIVE_VIEW_HOST_H_
#define VIEWS_CONTROLS_NATIVE_VIEW_HOST_H_
#include <string>
#include "views/view.h"
#include "base/gfx/native_widget_types.h"
namespace views {
// Base class for embedding native widgets in a view.
class NativeViewHost : public View {
public:
NativeViewHost();
virtual ~NativeViewHost();
void SetPreferredSize(const gfx::Size& size);
virtual gfx::Size GetPreferredSize();
// Overriden to invoke Layout.
virtual void VisibilityChanged(View* starting_from, bool is_visible);
// Invokes any of InstallClip, UninstallClip, ShowWidget or HideWidget
// depending upon what portion of the widget is view in the parent.
virtual void Layout();
// A NativeViewHost has an associated focus View so that the focus of the
// native control and of the View are kept in sync. In simple cases where the
// NativeViewHost directly wraps a native window as is, the associated view
// is this View. In other cases where the NativeViewHost is part of another
// view (such as TextField), the actual View is not the NativeViewHost and
// this method must be called to set that.
// This method must be called before Attach().
void SetAssociatedFocusView(View* view) { focus_view_ = view; }
View* associated_focus_view() { return focus_view_; }
void set_fast_resize(bool fast_resize) { fast_resize_ = fast_resize; }
bool fast_resize() const { return fast_resize_; }
// The embedded native view.
gfx::NativeView native_view() const { return native_view_; }
protected:
// Notification that our visible bounds relative to the root has changed.
// Invokes Layout to make sure the widget is positioned correctly.
virtual void VisibleBoundsInRootChanged();
// Sets the native view. Subclasses will typically invoke Layout after setting
// the widget.
void set_native_view(gfx::NativeView widget) { native_view_ = widget; }
// Installs a clip on the native widget.
virtual void InstallClip(int x, int y, int w, int h) = 0;
// Removes the clip installed on the native widget by way of InstallClip.
virtual void UninstallClip() = 0;
// Shows the widget at the specified position (relative to the parent widget).
virtual void ShowWidget(int x, int y, int w, int h) = 0;
// Hides the widget. NOTE: this may be invoked when the widget is already
// hidden.
virtual void HideWidget() = 0;
void set_installed_clip(bool installed_clip) {
installed_clip_ = installed_clip;
}
bool installed_clip() const { return installed_clip_; }
private:
gfx::NativeView native_view_;
// The preferred size of this View
gfx::Size preferred_size_;
// Have we installed a region on the HWND used to clip to only the visible
// portion of the HWND?
bool installed_clip_;
// Fast resizing will move the hwnd and clip its window region, this will
// result in white areas and will not resize the content (so scrollbars
// will be all wrong and content will flow offscreen). Only use this
// when you're doing extremely quick, high-framerate vertical resizes
// and don't care about accuracy. Make sure you do a real resize at the
// end. USE WITH CAUTION.
bool fast_resize_;
// The view that should be given focus when this NativeViewHost is focused.
View* focus_view_;
DISALLOW_COPY_AND_ASSIGN(NativeViewHost);
};
} // namespace views
#endif // VIEWS_CONTROLS_NATIVE_VIEW_HOST_H_
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