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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 <stdint.h>
#include <memory>
#include <vector>
#include "ash/wm/window_resizer.h"
#include "ash/wm/workspace/magnetism_matcher.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "ui/aura/window_tracker.h"
namespace ash {
class PhantomWindowController;
class TwoStepEdgeCycler;
class WindowSize;
namespace wm {
class WindowState;
// WindowResizer implementation for workspaces. This enforces that windows are
// not allowed to vertically move or resize outside of the work area. As windows
// are moved outside the work area they are shrunk. We remember the height of
// the window before it was moved so that if the window is again moved up we
// attempt to restore the old height.
class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
// When dragging an attached window this is the min size we'll make sure is
// visible. In the vertical direction we take the max of this and that from
// the delegate.
static const int kMinOnscreenSize;
// Min height we'll force on screen when dragging the caption.
// TODO: this should come from a property on the window.
static const int kMinOnscreenHeight;
// Snap region when dragging close to the edges. That is, as the window gets
// this close to an edge of the screen it snaps to the edge.
static const int kScreenEdgeInset;
// Distance in pixels that the cursor must move past an edge for a window
// to move or resize beyond that edge.
static const int kStickyDistancePixels;
~WorkspaceWindowResizer() override;
static WorkspaceWindowResizer* Create(
wm::WindowState* window_state,
const std::vector<aura::Window*>& attached_windows);
// WindowResizer:
void Drag(const gfx::Point& location_in_parent, int event_flags) override;
void CompleteDrag() override;
void RevertDrag() override;
void FlingOrSwipe(ui::GestureEvent* event) override;
friend class WorkspaceWindowResizerTest;
// The edge to which the window should be snapped at the end of the drag.
WorkspaceWindowResizer(wm::WindowState* window_state,
const std::vector<aura::Window*>& attached_windows);
// Lays out the attached windows. |bounds| is the bounds of the main window.
void LayoutAttachedWindows(gfx::Rect* bounds);
// Calculates the new sizes of the attached windows, given that the main
// window has been resized (along the primary axis) by |delta|.
// |available_size| is the maximum length of the space that the attached
// windows are allowed to occupy (ie: the distance between the right/bottom
// edge of the primary window and the right/bottom of the desktop area).
// Populates |sizes| with the desired sizes of the attached windows, and
// returns the number of pixels that couldn't be allocated to the attached
// windows (due to min/max size constraints).
// Note the return value can be positive or negative, a negative value
// indicating that that many pixels couldn't be removed from the attached
// windows.
int CalculateAttachedSizes(int delta,
int available_size,
std::vector<int>* sizes) const;
// Divides |amount| evenly between |sizes|. If |amount| is negative it
// indicates how many pixels |sizes| should be shrunk by.
// Returns how many pixels failed to be allocated/removed from |sizes|.
int GrowFairly(int amount, std::vector<WindowSize>* sizes) const;
// Calculate the ratio of pixels that each WindowSize in |sizes| should
// receive when growing or shrinking.
void CalculateGrowthRatios(const std::vector<WindowSize*>& sizes,
std::vector<float>* out_ratios) const;
// Adds a WindowSize to |sizes| for each attached window.
void CreateBucketsForAttached(std::vector<WindowSize>* sizes) const;
// If possible snaps the window to a neary window. Updates |bounds| if there
// was a close enough window.
void MagneticallySnapToOtherWindows(gfx::Rect* bounds);
// If possible snaps the resize to a neary window. Updates |bounds| if there
// was a close enough window.
void MagneticallySnapResizeToOtherWindows(gfx::Rect* bounds);
// Finds the neareset window to magentically snap to. Updates
// |magnetism_window_| and |magnetism_edge_| appropriately. |edges| is a
// bitmask of the MagnetismEdges to match again. Returns true if a match is
// found.
bool UpdateMagnetismWindow(const gfx::Rect& bounds, uint32_t edges);
// Adjusts the bounds of the window: magnetically snapping, ensuring the
// window has enough on screen... |snap_size| is the distance from an edge of
// the work area before the window is snapped. A value of 0 results in no
// snapping.
void AdjustBoundsForMainWindow(int snap_size, gfx::Rect* bounds);
// Stick the window bounds to the work area during a move.
bool StickToWorkAreaOnMove(const gfx::Rect& work_area,
int sticky_size,
gfx::Rect* bounds) const;
// Stick the window bounds to the work area during a resize.
void StickToWorkAreaOnResize(const gfx::Rect& work_area,
int sticky_size,
gfx::Rect* bounds) const;
// Returns a coordinate along the primary axis. Used to share code for
// left/right multi window resize and top/bottom resize.
int PrimaryAxisSize(const gfx::Size& size) const;
int PrimaryAxisCoordinate(int x, int y) const;
// Updates the bounds of the phantom window for window snapping.
void UpdateSnapPhantomWindow(const gfx::Point& location,
const gfx::Rect& bounds);
// Restacks the windows z-order position so that one of the windows is at the
// top of the z-order, and the rest directly underneath it.
void RestackWindows();
// Returns the edge to which the window should be snapped to if the user does
// no more dragging. SNAP_NONE is returned if the window should not be
// snapped.
SnapType GetSnapType(const gfx::Point& location) const;
// Returns true if |bounds_in_parent| are valid bounds for snapped state type
// |snapped_type|.
bool AreBoundsValidSnappedBounds(mojom::WindowStateType snapped_type,
const gfx::Rect& bounds_in_parent) const;
// Sets |window|'s state type to |new_state_type|. Called after the drag has
// been completed for fling/swipe gestures.
void SetWindowStateTypeFromGesture(aura::Window* window,
mojom::WindowStateType new_state_type);
wm::WindowState* window_state() { return window_state_; }
const std::vector<aura::Window*> attached_windows_;
// Returns the currently used instance for test.
static WorkspaceWindowResizer* GetInstanceForTest();
bool did_lock_cursor_;
// Set to true once Drag() is invoked and the bounds of the window change.
bool did_move_or_resize_;
// True if the window initially had |bounds_changed_by_user_| set in state.
bool initial_bounds_changed_by_user_;
// The initial size of each of the windows in |attached_windows_| along the
// primary axis.
std::vector<int> initial_size_;
// Sum of the minimum sizes of the attached windows.
int total_min_;
// Sum of the sizes in |initial_size_|.
int total_initial_size_;
// Gives a previews of where the the window will end up. Only used if there
// is a grid and the caption is being dragged.
std::unique_ptr<PhantomWindowController> snap_phantom_window_controller_;
// Used to determine whether the window should be snapped when the user drags
// a window to the edge of the screen.
std::unique_ptr<TwoStepEdgeCycler> edge_cycler_;
// The edge to which the window should be snapped to at the end of the drag.
SnapType snap_type_;
// Number of mouse moves since the last bounds change. Only used for phantom
// placement to track when the mouse is moved while pushed against the edge of
// the screen.
int num_mouse_moves_since_bounds_change_;
// The mouse location passed to Drag().
gfx::Point last_mouse_location_;
// Window the drag has magnetically attached to.
aura::Window* magnetism_window_;
// Used to verify |magnetism_window_| is still valid.
aura::WindowTracker window_tracker_;
// If |magnetism_window_| is non-NULL this indicates how the two windows
// should attach.
MatchedEdge magnetism_edge_;
// The window bounds when the drag was started. When a window is minimized,
// maximized or snapped via a swipe/fling gesture, the restore bounds should
// be set to the bounds of the window when the drag was started.
gfx::Rect pre_drag_window_bounds_;
// Used to determine if this has been deleted during a drag such as when a tab
// gets dragged into another browser window.
base::WeakPtrFactory<WorkspaceWindowResizer> weak_ptr_factory_;
} // namespace ash