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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.
#ifndef UI_PLATFORM_WINDOW_WM_WM_MOVE_RESIZE_HANDLER_H_
#define UI_PLATFORM_WINDOW_WM_WM_MOVE_RESIZE_HANDLER_H_
#include "base/component_export.h"
namespace gfx {
class Point;
} // namespace gfx
namespace ui {
class PlatformWindow;
class COMPONENT_EXPORT(WM) WmMoveResizeHandler {
public:
// A system window manager starts interactive drag or resize of a window based
// on the |hittest| value. The |hittest| value identifies in which direction
// the window should be resized or whether it should be moved. See
// ui/base/hit_test.h for a concrete example with chromium symbolic names
// defined. The |pointer_location_in_px| indicates the position of the button
// press with respect to the platform window in screen pixel coordinates,
// which is needed when sending a move/resize request in such backends as X11.
// See _NET_WM_MOVERESIZE section in
// https://specifications.freedesktop.org/wm-spec/1.4/ar01s04.html.
//
// There is no need to implement this by all the platforms except Ozone/X11
// and Ozone/Wayland, compositors of which support interactive move/resize.
//
// This API must be used on mouse or touch events, which are targeted for
// non-client components (check ui/base/hit_test.h again) except the ones
// targeted for components like HTMAXBUTTON. In that case, the mouse events
// are used to identify clicks on maximize/minimize/restore buttons located in
// the top non-client area of the chromium window. See
// WindowEventFilter::OnMouseEvent for a concrete example of how mouse events
// are identified as client or non-client.
//
// When the API is called, there is no way to know that the call was
// successful or not. The browser continues performing as usual except that a
// system compositor does not send any mouse/keyboard/etc events until user
// releases a mouse button. Instead, the compositor sends new bounds, which a
// client uses to recreate gpu buffers and redraw visual represantation of the
// browser.
virtual void DispatchHostWindowDragMovement(
int hittest,
const gfx::Point& pointer_location_in_px) = 0;
protected:
virtual ~WmMoveResizeHandler() {}
};
COMPONENT_EXPORT(WM)
void SetWmMoveResizeHandler(PlatformWindow* platform_window,
WmMoveResizeHandler* move_resize_handler);
COMPONENT_EXPORT(WM)
WmMoveResizeHandler* GetWmMoveResizeHandler(
const PlatformWindow& platform_window);
} // namespace ui
#endif // UI_PLATFORM_WINDOW_WM_WM_MOVE_RESIZE_HANDLER_H_
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