blob: 98751066733aa715ee492ce66597f09b3fc70742 [file] [log] [blame]
// 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/wm/window_resizer.h"
#include "ash/screen_ash.h"
#include "ash/shell.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/base/hit_test.h"
#include "ui/base/ui_base_types.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/screen.h"
namespace ash {
namespace {
int GetPositionChangeDirectionForWindowComponent(int window_component) {
int pos_change_direction = WindowResizer::kBoundsChangeDirection_None;
switch (window_component) {
case HTTOPLEFT:
case HTBOTTOMRIGHT:
case HTGROWBOX:
case HTCAPTION:
pos_change_direction |=
WindowResizer::kBoundsChangeDirection_Horizontal |
WindowResizer::kBoundsChangeDirection_Vertical;
break;
case HTTOP:
case HTTOPRIGHT:
case HTBOTTOM:
pos_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
break;
case HTBOTTOMLEFT:
case HTRIGHT:
case HTLEFT:
pos_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
break;
default:
break;
}
return pos_change_direction;
}
int GetSizeChangeDirectionForWindowComponent(int window_component) {
int size_change_direction = WindowResizer::kBoundsChangeDirection_None;
switch (window_component) {
case HTTOPLEFT:
case HTTOPRIGHT:
case HTBOTTOMLEFT:
case HTBOTTOMRIGHT:
case HTGROWBOX:
case HTCAPTION:
size_change_direction |=
WindowResizer::kBoundsChangeDirection_Horizontal |
WindowResizer::kBoundsChangeDirection_Vertical;
break;
case HTTOP:
case HTBOTTOM:
size_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
break;
case HTRIGHT:
case HTLEFT:
size_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
break;
default:
break;
}
return size_change_direction;
}
// Returns true for resize components along the right edge, where a drag in
// positive x will make the window larger.
bool IsRightEdge(int window_component) {
return window_component == HTTOPRIGHT ||
window_component == HTRIGHT ||
window_component == HTBOTTOMRIGHT ||
window_component == HTGROWBOX;
}
} // namespace
// static
const int WindowResizer::kBoundsChange_None = 0;
// static
const int WindowResizer::kBoundsChange_Repositions = 1;
// static
const int WindowResizer::kBoundsChange_Resizes = 2;
// static
const int WindowResizer::kBoundsChangeDirection_None = 0;
// static
const int WindowResizer::kBoundsChangeDirection_Horizontal = 1;
// static
const int WindowResizer::kBoundsChangeDirection_Vertical = 2;
WindowResizer::Details::Details()
: window(NULL),
window_component(HTNOWHERE),
bounds_change(0),
position_change_direction(0),
size_change_direction(0),
is_resizable(false) {
}
WindowResizer::Details::Details(aura::Window* window,
const gfx::Point& location,
int window_component)
: window(window),
initial_bounds(window->bounds()),
initial_location_in_parent(location),
window_component(window_component),
bounds_change(GetBoundsChangeForWindowComponent(window_component)),
position_change_direction(
GetPositionChangeDirectionForWindowComponent(window_component)),
size_change_direction(
GetSizeChangeDirectionForWindowComponent(window_component)),
is_resizable(bounds_change != kBoundsChangeDirection_None) {
}
WindowResizer::Details::~Details() {
}
WindowResizer::WindowResizer() {
}
WindowResizer::~WindowResizer() {
}
// static
int WindowResizer::GetBoundsChangeForWindowComponent(int component) {
int bounds_change = WindowResizer::kBoundsChange_None;
switch (component) {
case HTTOPLEFT:
case HTTOP:
case HTTOPRIGHT:
case HTLEFT:
case HTBOTTOMLEFT:
bounds_change |= WindowResizer::kBoundsChange_Repositions |
WindowResizer::kBoundsChange_Resizes;
break;
case HTCAPTION:
bounds_change |= WindowResizer::kBoundsChange_Repositions;
break;
case HTRIGHT:
case HTBOTTOMRIGHT:
case HTBOTTOM:
case HTGROWBOX:
bounds_change |= WindowResizer::kBoundsChange_Resizes;
break;
default:
break;
}
return bounds_change;
}
// static
int WindowResizer::AlignToGrid(int location, int grid_size) {
if (grid_size <= 1 || location % grid_size == 0)
return location;
return floor(static_cast<float>(location) / static_cast<float>(grid_size) +
.5f) * grid_size;
}
// static
int WindowResizer::AlignToGridRoundUp(int location, int grid_size) {
if (grid_size <= 1 || location % grid_size == 0)
return location;
return (location / grid_size + 1) * grid_size;
}
// static
int WindowResizer::AlignToGridRoundDown(int location, int grid_size) {
if (grid_size <= 1 || location % grid_size == 0)
return location;
return location / grid_size * grid_size;
}
// static
gfx::Rect WindowResizer::CalculateBoundsForDrag(
const Details& details,
const gfx::Point& location,
int grid_size) {
if (!details.is_resizable)
return details.initial_bounds;
int delta_x = location.x() - details.initial_location_in_parent.x();
int delta_y = location.y() - details.initial_location_in_parent.y();
// The minimize size constraint may limit how much we change the window
// position. For example, dragging the left edge to the right should stop
// repositioning the window when the minimize size is reached.
gfx::Size size = GetSizeForDrag(details, &delta_x, &delta_y, grid_size);
gfx::Point origin = GetOriginForDrag(details, delta_x, delta_y);
gfx::Rect new_bounds(origin, size);
// Update bottom edge to stay in the work area when we are resizing
// by dragging the bottome edge or corners.
if (details.window_component == HTBOTTOM ||
details.window_component == HTBOTTOMRIGHT ||
details.window_component == HTBOTTOMLEFT) {
gfx::Rect work_area =
ScreenAsh::GetDisplayWorkAreaBoundsInParent(details.window);
if (new_bounds.bottom() > work_area.bottom())
new_bounds.Inset(0, 0, 0,
new_bounds.bottom() - work_area.bottom());
}
if (details.bounds_change & kBoundsChange_Resizes &&
details.bounds_change & kBoundsChange_Repositions && new_bounds.y() < 0) {
int delta = new_bounds.y();
new_bounds.set_y(0);
new_bounds.set_height(new_bounds.height() + delta);
}
return new_bounds;
}
// static
gfx::Rect WindowResizer::AdjustBoundsToGrid(const gfx::Rect& bounds,
int grid_size) {
if (grid_size <= 1)
return bounds;
int x = AlignToGrid(bounds.x(), grid_size);
int y = AlignToGrid(bounds.y(), grid_size);
return gfx::Rect(x, y, bounds.width(), bounds.height());
}
// static
bool WindowResizer::IsBottomEdge(int window_component) {
return window_component == HTBOTTOMLEFT ||
window_component == HTBOTTOM ||
window_component == HTBOTTOMRIGHT ||
window_component == HTGROWBOX;
}
// static
gfx::Point WindowResizer::GetOriginForDrag(const Details& details,
int delta_x,
int delta_y) {
gfx::Point origin = details.initial_bounds.origin();
if (details.bounds_change & kBoundsChange_Repositions) {
int pos_change_direction =
GetPositionChangeDirectionForWindowComponent(details.window_component);
if (pos_change_direction & kBoundsChangeDirection_Horizontal)
origin.Offset(delta_x, 0);
if (pos_change_direction & kBoundsChangeDirection_Vertical)
origin.Offset(0, delta_y);
}
return origin;
}
// static
gfx::Size WindowResizer::GetSizeForDrag(const Details& details,
int* delta_x,
int* delta_y,
int grid_size) {
gfx::Size size = details.initial_bounds.size();
if (details.bounds_change & kBoundsChange_Resizes) {
gfx::Size min_size = details.window->delegate()->GetMinimumSize();
min_size.set_width(AlignToGridRoundUp(min_size.width(), grid_size));
min_size.set_height(AlignToGridRoundUp(min_size.height(), grid_size));
size.SetSize(GetWidthForDrag(details, min_size.width(), delta_x,
grid_size),
GetHeightForDrag(details, min_size.height(), delta_y,
grid_size));
}
return size;
}
// static
int WindowResizer::GetWidthForDrag(const Details& details,
int min_width,
int* delta_x,
int grid_size) {
int width = details.initial_bounds.width();
if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
// Along the right edge, positive delta_x increases the window size.
int x_multiplier = IsRightEdge(details.window_component) ? 1 : -1;
width += x_multiplier * (*delta_x);
int adjusted_width = AlignToGrid(width, grid_size);
if (adjusted_width != width) {
*delta_x += -x_multiplier * (width - adjusted_width);
width = adjusted_width;
}
// Ensure we don't shrink past the minimum width and clamp delta_x
// for the window origin computation.
if (width < min_width) {
width = min_width;
*delta_x = -x_multiplier * (details.initial_bounds.width() - min_width);
}
// And don't let the window go bigger than the display.
int max_width =
gfx::Screen::GetDisplayNearestWindow(details.window).bounds().width();
if (width > max_width) {
width = max_width;
*delta_x = -x_multiplier * (details.initial_bounds.width() - max_width);
}
}
return width;
}
// static
int WindowResizer::GetHeightForDrag(const Details& details,
int min_height,
int* delta_y,
int grid_size) {
int height = details.initial_bounds.height();
if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
// Along the bottom edge, positive delta_y increases the window size.
int y_multiplier = IsBottomEdge(details.window_component) ? 1 : -1;
height += y_multiplier * (*delta_y);
int adjusted_height = AlignToGrid(height, grid_size);
if (height != adjusted_height) {
*delta_y += -y_multiplier * (height - adjusted_height);
height = adjusted_height;
}
// Ensure we don't shrink past the minimum height and clamp delta_y
// for the window origin computation.
if (height < min_height) {
height = min_height;
*delta_y = -y_multiplier * (details.initial_bounds.height() - min_height);
}
// And don't let the window go bigger than the display.
int max_height =
gfx::Screen::GetDisplayNearestWindow(details.window).bounds().height();
if (height > max_height) {
height = max_height;
*delta_y = -y_multiplier * (details.initial_bounds.height() - max_height);
}
}
return height;
}
} // namespace aura