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// Copyright (c) 2012 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 "ash/ash_export.h"
#include "base/basictypes.h"
#include "ui/gfx/rect.h"
namespace aura {
class Window;
namespace ash {
// WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving
// or resizing a window. All coordinates passed to this are in the parent
// windows coordinates.
class ASH_EXPORT WindowResizer {
// Constants to identify the type of resize.
static const int kBoundsChange_None;
static const int kBoundsChange_Repositions;
static const int kBoundsChange_Resizes;
// Used to indicate which direction the resize occurs in.
static const int kBoundsChangeDirection_None;
static const int kBoundsChangeDirection_Horizontal;
static const int kBoundsChangeDirection_Vertical;
virtual ~WindowResizer();
// Returns a bitmask of the kBoundsChange_ values.
static int GetBoundsChangeForWindowComponent(int component);
// Returns a location >= |location| that is aligned to fall on increments of
// |grid_size|.
static int AlignToGrid(int location, int grid_size);
// Variant of AlignToGrid that rounds up.
static int AlignToGridRoundUp(int location, int grid_size);
// Variant of AlignToGrid that rounds down.
static int AlignToGridRoundDown(int location, int grid_size);
// Invoked to drag/move/resize the window. |location| is in the coordinates
// of the window supplied to the constructor. |event_flags| is the event
// flags from the event.
virtual void Drag(const gfx::Point& location, int event_flags) = 0;
// Invoked to complete the drag.
virtual void CompleteDrag(int event_flags) = 0;
// Reverts the drag.
virtual void RevertDrag() = 0;
struct Details {
Details(aura::Window* window,
const gfx::Point& location,
int window_component);
// The window we're resizing.
aura::Window* window;
// Initial bounds of the window.
gfx::Rect initial_bounds;
// Location passed to the constructor, in |window->parent()|'s coordinates.
gfx::Point initial_location_in_parent;
// The component the user pressed on.
int window_component;
// Bitmask of the |kBoundsChange_| constants.
int bounds_change;
// Bitmask of the |kBoundsChangeDirection_| constants.
int position_change_direction;
// Bitmask of the |kBoundsChangeDirection_| constants.
int size_change_direction;
// Will the drag actually modify the window?
bool is_resizable;
static gfx::Rect CalculateBoundsForDrag(
const Details& details,
const gfx::Point& location,
int grid_size);
static gfx::Rect AdjustBoundsToGrid(const gfx::Rect& bounds,
int grid_size);
static bool IsBottomEdge(int component);
// Returns the new origin of the window. The arguments are the difference
// between the current location and the initial location.
static gfx::Point GetOriginForDrag(const Details& details,
int delta_x,
int delta_y);
// Returns the size of the window for the drag.
static gfx::Size GetSizeForDrag(const Details& details,
int* delta_x,
int* delta_y,
int grid_size);
// Returns the width of the window.
static int GetWidthForDrag(const Details& details,
int min_width,
int* delta_x,
int grid_size);
// Returns the height of the drag.
static int GetHeightForDrag(const Details& details,
int min_height,
int* delta_y,
int grid_size);
} // namespace aura