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chromium / chromium / src / 1454ad1f261d1089f2ac20cdc6e7e3d2562d731c / . / ash / wm / workspace / workspace_window_resizer.cc
blob: a9bf31497b69df4dfeddf6803f42dbde6f082feb [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/workspace/workspace_window_resizer.h"
#include <algorithm>
#include <cmath>
#include <memory>
#include <utility>
#include <vector>
#include "ash/public/cpp/app_types.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/root_window_controller.h"
#include "ash/screen_util.h"
#include "ash/shell.h"
#include "ash/wm/default_window_resizer.h"
#include "ash/wm/drag_window_resizer.h"
#include "ash/wm/pip/pip_window_resizer.h"
#include "ash/wm/tablet_mode/tablet_mode_browser_window_drag_controller.h"
#include "ash/wm/tablet_mode/tablet_mode_controller.h"
#include "ash/wm/window_positioning_utils.h"
#include "ash/wm/window_state.h"
#include "ash/wm/window_util.h"
#include "ash/wm/wm_event.h"
#include "ash/wm/workspace/phantom_window_controller.h"
#include "ash/wm/workspace/two_step_edge_cycler.h"
#include "base/memory/weak_ptr.h"
#include "base/metrics/user_metrics.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/client/window_types.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/base/class_property.h"
#include "ui/base/hit_test.h"
#include "ui/compositor/layer.h"
#include "ui/display/display.h"
#include "ui/display/screen.h"
#include "ui/gfx/transform.h"
#include "ui/wm/core/coordinate_conversion.h"
#include "ui/wm/core/cursor_manager.h"
namespace {
constexpr double kMinHorizVelocityForWindowSwipe = 1100;
constexpr double kMinVertVelocityForWindowMinimize = 1000;
// Returns true if |window| can be dragged from the top of the screen in tablet
// mode.
bool CanDragInTabletMode(aura::Window* window, int window_component) {
ash::wm::WindowState* window_state = ash::wm::GetWindowState(window);
// Pip window can't be dragged.
if (window_state->IsPip())
return false;
// Only maximized/fullscreen/snapped window can be dragged from the top of
// the screen.
if (!window_state->IsMaximized() && !window_state->IsFullscreen() &&
!window_state->IsSnapped()) {
return false;
}
// Only allow drag that happens on caption or top area. Note: for a maxmized
// or fullscreen window, the window component here is always HTCAPTION, but
// for a snapped window, the window component here can either be HTCAPTION or
// HTTOP.
if (window_component != HTCAPTION && window_component != HTTOP)
return false;
// Note: only browser windows and chrome app windows are included here.
// For browser windows, this piece of codes will be called no matter the
// drag happens on the tab(s) or on the non-tabstrip caption or top area.
// But for app window, this piece of codes will only be called if the chrome
// app window has its customized caption area and can't be hidden in tablet
// mode (and thus the drag for this type of chrome app window always happens
// on caption or top area). If the caption area of the chrome app window can
// be hidden, ImmersiveGestureHandlerClassic will handle the window drag
// through TabletModeAppWindowDragController.
// TODO(xdai, minch): Merge the logic in ImmersiveGestureHandlerClassic into
// CreateWindowResizer() in future.
ash::AppType app_type =
static_cast<ash::AppType>(window->GetProperty(aura::client::kAppType));
if (app_type != ash::AppType::BROWSER &&
app_type != ash::AppType::CHROME_APP) {
return false;
}
return true;
}
} // namespace
namespace ash {
std::unique_ptr<WindowResizer> CreateWindowResizer(
aura::Window* window,
const gfx::Point& point_in_parent,
int window_component,
::wm::WindowMoveSource source) {
DCHECK(window);
wm::WindowState* window_state = wm::GetWindowState(window);
// No need to return a resizer when the window cannot get resized or when a
// resizer already exists for this window.
if ((!window_state->CanResize() && window_component != HTCAPTION) ||
window_state->drag_details()) {
return nullptr;
}
// TODO(varkha): The chaining of window resizers causes some of the logic
// to be repeated and the logic flow difficult to control. With some windows
// classes using reparenting during drag operations it becomes challenging to
// implement proper transition from one resizer to another during or at the
// end of the drag. This also causes http://crbug.com/247085.
// We should have a better way of doing this, perhaps by having a way of
// observing drags or having a generic drag window wrapper which informs a
// layout manager that a drag has started or stopped. It may be possible to
// refactor and eliminate chaining.
std::unique_ptr<WindowResizer> window_resizer;
if (window_state->IsPip()) {
window_state->CreateDragDetails(point_in_parent, window_component, source);
window_resizer = std::make_unique<PipWindowResizer>(window_state);
return window_resizer;
}
if (Shell::Get()
->tablet_mode_controller()
->IsTabletModeWindowManagerEnabled()) {
if (!CanDragInTabletMode(window, window_component))
return nullptr;
window_state->CreateDragDetails(point_in_parent, window_component, source);
window_resizer =
std::make_unique<TabletModeBrowserWindowDragController>(window_state);
window_resizer = std::make_unique<DragWindowResizer>(
std::move(window_resizer), window_state);
return window_resizer;
}
if (!window_state->IsNormalOrSnapped())
return nullptr;
int bounds_change =
WindowResizer::GetBoundsChangeForWindowComponent(window_component);
if (bounds_change == WindowResizer::kBoundsChangeDirection_None)
return nullptr;
window_state->CreateDragDetails(point_in_parent, window_component, source);
const int parent_shell_window_id =
window->parent() ? window->parent()->id() : -1;
if (window->parent() &&
(parent_shell_window_id == kShellWindowId_DefaultContainer ||
parent_shell_window_id == kShellWindowId_AlwaysOnTopContainer)) {
window_resizer.reset(WorkspaceWindowResizer::Create(
window_state, std::vector<aura::Window*>()));
} else {
window_resizer.reset(DefaultWindowResizer::Create(window_state));
}
window_resizer = std::make_unique<DragWindowResizer>(
std::move(window_resizer), window_state);
return window_resizer;
}
namespace {
// Snapping distance used instead of WorkspaceWindowResizer::kScreenEdgeInset
// when resizing a window using touchscreen.
const int kScreenEdgeInsetForTouchDrag = 32;
// Current instance for use by the WorkspaceWindowResizerTest.
WorkspaceWindowResizer* instance = NULL;
// Returns true if the window should stick to the edge.
bool ShouldStickToEdge(int distance_from_edge, int sticky_size) {
return distance_from_edge < sticky_size &&
distance_from_edge > -sticky_size * 2;
}
// Returns the coordinate along the secondary axis to snap to.
int CoordinateAlongSecondaryAxis(SecondaryMagnetismEdge edge,
int leading,
int trailing,
int none) {
switch (edge) {
case SECONDARY_MAGNETISM_EDGE_LEADING:
return leading;
case SECONDARY_MAGNETISM_EDGE_TRAILING:
return trailing;
case SECONDARY_MAGNETISM_EDGE_NONE:
return none;
}
NOTREACHED();
return none;
}
// Returns the origin for |src| when magnetically attaching to |attach_to| along
// the edges |edges|. |edges| is a bitmask of the MagnetismEdges.
gfx::Point OriginForMagneticAttach(const gfx::Rect& src,
const gfx::Rect& attach_to,
const MatchedEdge& edge) {
int x = 0, y = 0;
switch (edge.primary_edge) {
case MAGNETISM_EDGE_TOP:
y = attach_to.bottom();
break;
case MAGNETISM_EDGE_LEFT:
x = attach_to.right();
break;
case MAGNETISM_EDGE_BOTTOM:
y = attach_to.y() - src.height();
break;
case MAGNETISM_EDGE_RIGHT:
x = attach_to.x() - src.width();
break;
}
switch (edge.primary_edge) {
case MAGNETISM_EDGE_TOP:
case MAGNETISM_EDGE_BOTTOM:
x = CoordinateAlongSecondaryAxis(edge.secondary_edge, attach_to.x(),
attach_to.right() - src.width(),
src.x());
break;
case MAGNETISM_EDGE_LEFT:
case MAGNETISM_EDGE_RIGHT:
y = CoordinateAlongSecondaryAxis(edge.secondary_edge, attach_to.y(),
attach_to.bottom() - src.height(),
src.y());
break;
}
return gfx::Point(x, y);
}
// Returns the bounds for a magnetic attach when resizing. |src| is the bounds
// of window being resized, |attach_to| the bounds of the window to attach to
// and |edge| identifies the edge to attach to.
gfx::Rect BoundsForMagneticResizeAttach(const gfx::Rect& src,
const gfx::Rect& attach_to,
const MatchedEdge& edge) {
int x = src.x();
int y = src.y();
int w = src.width();
int h = src.height();
gfx::Point attach_origin(OriginForMagneticAttach(src, attach_to, edge));
switch (edge.primary_edge) {
case MAGNETISM_EDGE_LEFT:
x = attach_origin.x();
w = src.right() - x;
break;
case MAGNETISM_EDGE_RIGHT:
w += attach_origin.x() - src.x();
break;
case MAGNETISM_EDGE_TOP:
y = attach_origin.y();
h = src.bottom() - y;
break;
case MAGNETISM_EDGE_BOTTOM:
h += attach_origin.y() - src.y();
break;
}
switch (edge.primary_edge) {
case MAGNETISM_EDGE_LEFT:
case MAGNETISM_EDGE_RIGHT:
if (edge.secondary_edge == SECONDARY_MAGNETISM_EDGE_LEADING) {
y = attach_origin.y();
h = src.bottom() - y;
} else if (edge.secondary_edge == SECONDARY_MAGNETISM_EDGE_TRAILING) {
h += attach_origin.y() - src.y();
}
break;
case MAGNETISM_EDGE_TOP:
case MAGNETISM_EDGE_BOTTOM:
if (edge.secondary_edge == SECONDARY_MAGNETISM_EDGE_LEADING) {
x = attach_origin.x();
w = src.right() - x;
} else if (edge.secondary_edge == SECONDARY_MAGNETISM_EDGE_TRAILING) {
w += attach_origin.x() - src.x();
}
break;
}
return gfx::Rect(x, y, w, h);
}
// Converts a window component edge to the magnetic edge to snap to.
uint32_t WindowComponentToMagneticEdge(int window_component) {
switch (window_component) {
case HTTOPLEFT:
return MAGNETISM_EDGE_LEFT | MAGNETISM_EDGE_TOP;
case HTTOPRIGHT:
return MAGNETISM_EDGE_TOP | MAGNETISM_EDGE_RIGHT;
case HTBOTTOMLEFT:
return MAGNETISM_EDGE_LEFT | MAGNETISM_EDGE_BOTTOM;
case HTBOTTOMRIGHT:
return MAGNETISM_EDGE_RIGHT | MAGNETISM_EDGE_BOTTOM;
case HTTOP:
return MAGNETISM_EDGE_TOP;
case HTBOTTOM:
return MAGNETISM_EDGE_BOTTOM;
case HTRIGHT:
return MAGNETISM_EDGE_RIGHT;
case HTLEFT:
return MAGNETISM_EDGE_LEFT;
default:
break;
}
return 0;
}
} // namespace
// static
const int WorkspaceWindowResizer::kMinOnscreenSize = 20;
// static
const int WorkspaceWindowResizer::kMinOnscreenHeight = 32;
// static
const int WorkspaceWindowResizer::kScreenEdgeInset = 8;
WorkspaceWindowResizer* WorkspaceWindowResizer::GetInstanceForTest() {
return instance;
}
// Represents the width or height of a window with constraints on its minimum
// and maximum size. 0 represents a lack of a constraint.
class WindowSize {
public:
WindowSize(int size, int min, int max) : size_(size), min_(min), max_(max) {
// Grow the min/max bounds to include the starting size.
if (is_underflowing())
min_ = size_;
if (is_overflowing())
max_ = size_;
}
bool is_at_capacity(bool shrinking) const {
return size_ == (shrinking ? min_ : max_);
}
int size() const { return size_; }
bool has_min() const { return min_ != 0; }
bool has_max() const { return max_ != 0; }
bool is_valid() const { return !is_overflowing() && !is_underflowing(); }
bool is_overflowing() const { return has_max() && size_ > max_; }
bool is_underflowing() const { return has_min() && size_ < min_; }
// Add |amount| to this WindowSize not exceeding min or max size constraints.
// Returns by how much |size_| + |amount| exceeds the min/max constraints.
int Add(int amount) {
DCHECK(is_valid());
int new_value = size_ + amount;
if (has_min() && new_value < min_) {
size_ = min_;
return new_value - min_;
}
if (has_max() && new_value > max_) {
size_ = max_;
return new_value - max_;
}
size_ = new_value;
return 0;
}
private:
int size_;
int min_;
int max_;
};
WorkspaceWindowResizer::~WorkspaceWindowResizer() {
if (did_lock_cursor_)
Shell::Get()->cursor_manager()->UnlockCursor();
if (instance == this)
instance = NULL;
}
// static
WorkspaceWindowResizer* WorkspaceWindowResizer::Create(
wm::WindowState* window_state,
const std::vector<aura::Window*>& attached_windows) {
return new WorkspaceWindowResizer(window_state, attached_windows);
}
void WorkspaceWindowResizer::Drag(const gfx::Point& location_in_parent,
int event_flags) {
last_mouse_location_ = location_in_parent;
int sticky_size;
if (event_flags & ui::EF_CONTROL_DOWN) {
sticky_size = 0;
} else if ((details().bounds_change & kBoundsChange_Resizes) &&
details().source == ::wm::WINDOW_MOVE_SOURCE_TOUCH) {
sticky_size = kScreenEdgeInsetForTouchDrag;
} else {
sticky_size = kScreenEdgeInset;
}
// |bounds| is in |GetTarget()->parent()|'s coordinates.
gfx::Rect bounds = CalculateBoundsForDrag(location_in_parent);
AdjustBoundsForMainWindow(sticky_size, &bounds);
if (bounds != GetTarget()->bounds()) {
if (!did_move_or_resize_) {
if (!details().restore_bounds.IsEmpty())
window_state()->ClearRestoreBounds();
RestackWindows();
}
did_move_or_resize_ = true;
}
gfx::Point location_in_screen = location_in_parent;
::wm::ConvertPointToScreen(GetTarget()->parent(), &location_in_screen);
aura::Window* root = nullptr;
display::Display display =
display::Screen::GetScreen()->GetDisplayNearestPoint(location_in_screen);
// Track the last screen that the pointer was on to keep the snap phantom
// window there.
if (display.bounds().Contains(location_in_screen)) {
root = Shell::GetRootWindowControllerWithDisplayId(display.id())
->GetRootWindow();
}
if (!attached_windows_.empty())
LayoutAttachedWindows(&bounds);
if (bounds != GetTarget()->bounds()) {
// SetBounds needs to be called to update the layout which affects where the
// phantom window is drawn. Keep track if the window was destroyed during
// the drag and quit early if so.
base::WeakPtr<WorkspaceWindowResizer> resizer(
weak_ptr_factory_.GetWeakPtr());
GetTarget()->SetBounds(bounds);
if (!resizer)
return;
}
const bool in_original_root = !root || root == GetTarget()->GetRootWindow();
// Hide a phantom window for snapping if the cursor is in another root window.
if (in_original_root) {
UpdateSnapPhantomWindow(location_in_parent, bounds);
} else {
snap_type_ = SNAP_NONE;
snap_phantom_window_controller_.reset();
edge_cycler_.reset();
}
}
void WorkspaceWindowResizer::CompleteDrag() {
gfx::Point last_mouse_location_in_screen = last_mouse_location_;
::wm::ConvertPointToScreen(GetTarget()->parent(),
&last_mouse_location_in_screen);
window_state()->OnCompleteDrag(last_mouse_location_in_screen);
if (!did_move_or_resize_)
return;
window_state()->set_bounds_changed_by_user(true);
snap_phantom_window_controller_.reset();
// If the window's state type changed over the course of the drag do not snap
// the window. This happens when the user minimizes or maximizes the window
// using a keyboard shortcut while dragging it.
if (window_state()->GetStateType() != details().initial_state_type)
return;
bool snapped = false;
if (snap_type_ == SNAP_LEFT || snap_type_ == SNAP_RIGHT) {
if (!window_state()->HasRestoreBounds()) {
gfx::Rect initial_bounds = details().initial_bounds_in_parent;
::wm::ConvertRectToScreen(GetTarget()->parent(), &initial_bounds);
window_state()->SetRestoreBoundsInScreen(
details().restore_bounds.IsEmpty() ? initial_bounds
: details().restore_bounds);
}
// TODO(oshima): Add event source type to WMEvent and move
// metrics recording inside WindowState::OnWMEvent.
const wm::WMEvent event(snap_type_ == SNAP_LEFT ? wm::WM_EVENT_SNAP_LEFT
: wm::WM_EVENT_SNAP_RIGHT);
window_state()->OnWMEvent(&event);
if (snap_type_ == SNAP_LEFT)
base::RecordAction(base::UserMetricsAction("WindowDrag_MaximizeLeft"));
else
base::RecordAction(base::UserMetricsAction("WindowDrag_MaximizeRight"));
snapped = true;
}
if (!snapped) {
if (window_state()->IsSnapped()) {
// Keep the window snapped if the user resizes the window such that the
// window has valid bounds for a snapped window. Always unsnap the window
// if the user dragged the window via the caption area because doing this
// is slightly less confusing.
if (details().window_component == HTCAPTION ||
!AreBoundsValidSnappedBounds(window_state()->GetStateType(),
GetTarget()->bounds())) {
// Set the window to WindowStateType::NORMAL but keep the
// window at the bounds that the user has moved/resized the
// window to.
window_state()->SaveCurrentBoundsForRestore();
window_state()->Restore();
}
} else {
// The window was not snapped and is not snapped. This is a user
// resize/drag and so the current bounds should be maintained, clearing
// any prior restore bounds.
window_state()->ClearRestoreBounds();
}
}
}
void WorkspaceWindowResizer::RevertDrag() {
gfx::Point last_mouse_location_in_screen = last_mouse_location_;
::wm::ConvertPointToScreen(GetTarget()->parent(),
&last_mouse_location_in_screen);
window_state()->OnRevertDrag(last_mouse_location_in_screen);
window_state()->set_bounds_changed_by_user(initial_bounds_changed_by_user_);
snap_phantom_window_controller_.reset();
if (!did_move_or_resize_)
return;
GetTarget()->SetBounds(details().initial_bounds_in_parent);
if (!details().restore_bounds.IsEmpty())
window_state()->SetRestoreBoundsInScreen(details().restore_bounds);
if (details().window_component == HTRIGHT) {
int last_x = details().initial_bounds_in_parent.right();
for (size_t i = 0; i < attached_windows_.size(); ++i) {
gfx::Rect bounds(attached_windows_[i]->bounds());
bounds.set_x(last_x);
bounds.set_width(initial_size_[i]);
attached_windows_[i]->SetBounds(bounds);
last_x = attached_windows_[i]->bounds().right();
}
} else {
int last_y = details().initial_bounds_in_parent.bottom();
for (size_t i = 0; i < attached_windows_.size(); ++i) {
gfx::Rect bounds(attached_windows_[i]->bounds());
bounds.set_y(last_y);
bounds.set_height(initial_size_[i]);
attached_windows_[i]->SetBounds(bounds);
last_y = attached_windows_[i]->bounds().bottom();
}
}
}
void WorkspaceWindowResizer::FlingOrSwipe(ui::GestureEvent* event) {
if (event->type() != ui::ET_SCROLL_FLING_START &&
event->type() != ui::ET_GESTURE_SWIPE) {
return;
}
if (event->type() == ui::ET_SCROLL_FLING_START) {
CompleteDrag();
// TODO(pkotwicz): Fix tests which inadvertently start flings and check
// window_resizer_->IsMove() instead of the hittest component at |event|'s
// location.
if (wm::GetNonClientComponent(GetTarget(), event->location()) !=
HTCAPTION ||
!wm::GetWindowState(GetTarget())->IsNormalOrSnapped()) {
return;
}
if (event->details().velocity_y() > kMinVertVelocityForWindowMinimize) {
SetWindowStateTypeFromGesture(GetTarget(),
mojom::WindowStateType::MINIMIZED);
} else if (event->details().velocity_y() <
-kMinVertVelocityForWindowMinimize) {
SetWindowStateTypeFromGesture(GetTarget(),
mojom::WindowStateType::MAXIMIZED);
} else if (event->details().velocity_x() >
kMinHorizVelocityForWindowSwipe) {
SetWindowStateTypeFromGesture(GetTarget(),
mojom::WindowStateType::RIGHT_SNAPPED);
} else if (event->details().velocity_x() <
-kMinHorizVelocityForWindowSwipe) {
SetWindowStateTypeFromGesture(GetTarget(),
mojom::WindowStateType::LEFT_SNAPPED);
}
} else {
DCHECK_EQ(event->type(), ui::ET_GESTURE_SWIPE);
DCHECK_GT(event->details().touch_points(), 0);
if (event->details().touch_points() == 1)
return;
if (!wm::GetWindowState(GetTarget())->IsNormalOrSnapped())
return;
CompleteDrag();
if (event->details().swipe_down()) {
SetWindowStateTypeFromGesture(GetTarget(),
mojom::WindowStateType::MINIMIZED);
} else if (event->details().swipe_up()) {
SetWindowStateTypeFromGesture(GetTarget(),
mojom::WindowStateType::MAXIMIZED);
} else if (event->details().swipe_right()) {
SetWindowStateTypeFromGesture(GetTarget(),
mojom::WindowStateType::RIGHT_SNAPPED);
} else {
SetWindowStateTypeFromGesture(GetTarget(),
mojom::WindowStateType::LEFT_SNAPPED);
}
}
event->StopPropagation();
}
WorkspaceWindowResizer::WorkspaceWindowResizer(
wm::WindowState* window_state,
const std::vector<aura::Window*>& attached_windows)
: WindowResizer(window_state),
attached_windows_(attached_windows),
did_lock_cursor_(false),
did_move_or_resize_(false),
initial_bounds_changed_by_user_(window_state_->bounds_changed_by_user()),
total_min_(0),
total_initial_size_(0),
snap_type_(SNAP_NONE),
num_mouse_moves_since_bounds_change_(0),
magnetism_window_(NULL),
weak_ptr_factory_(this) {
DCHECK(details().is_resizable);
// A mousemove should still show the cursor even if the window is
// being moved or resized with touch, so do not lock the cursor.
// If the window state is controlled by a client, which may set the
// cursor by itself, don't lock the cursor.
if (details().source != ::wm::WINDOW_MOVE_SOURCE_TOUCH &&
!window_state->allow_set_bounds_direct()) {
Shell::Get()->cursor_manager()->LockCursor();
did_lock_cursor_ = true;
}
// Only support attaching to the right/bottom.
DCHECK(attached_windows_.empty() || (details().window_component == HTRIGHT ||
details().window_component == HTBOTTOM));
// TODO: figure out how to deal with window going off the edge.
// Calculate sizes so that we can maintain the ratios if we need to resize.
int total_available = 0;
for (size_t i = 0; i < attached_windows_.size(); ++i) {
gfx::Size min(attached_windows_[i]->delegate()
? attached_windows_[i]->delegate()->GetMinimumSize()
: gfx::Size());
int initial_size = PrimaryAxisSize(attached_windows_[i]->bounds().size());
initial_size_.push_back(initial_size);
// If current size is smaller than the min, use the current size as the min.
// This way we don't snap on resize.
int min_size = std::min(initial_size,
std::max(PrimaryAxisSize(min), kMinOnscreenSize));
total_min_ += min_size;
total_initial_size_ += initial_size;
total_available += std::max(min_size, initial_size) - min_size;
}
instance = this;
pre_drag_window_bounds_ = window_state->window()->bounds();
window_state->OnDragStarted(details().window_component);
}
void WorkspaceWindowResizer::LayoutAttachedWindows(gfx::Rect* bounds) {
gfx::Rect work_area(
screen_util::GetDisplayWorkAreaBoundsInParent(GetTarget()));
int initial_size = PrimaryAxisSize(details().initial_bounds_in_parent.size());
int current_size = PrimaryAxisSize(bounds->size());
int start = PrimaryAxisCoordinate(bounds->right(), bounds->bottom());
int end = PrimaryAxisCoordinate(work_area.right(), work_area.bottom());
int delta = current_size - initial_size;
int available_size = end - start;
std::vector<int> sizes;
int leftovers = CalculateAttachedSizes(delta, available_size, &sizes);
// leftovers > 0 means that the attached windows can't grow to compensate for
// the shrinkage of the main window. This line causes the attached windows to
// be moved so they are still flush against the main window, rather than the
// main window being prevented from shrinking.
leftovers = std::min(0, leftovers);
// Reallocate any leftover pixels back into the main window. This is
// necessary when, for example, the main window shrinks, but none of the
// attached windows can grow without exceeding their max size constraints.
// Adding the pixels back to the main window effectively prevents the main
// window from resizing too far.
if (details().window_component == HTRIGHT)
bounds->set_width(bounds->width() + leftovers);
else
bounds->set_height(bounds->height() + leftovers);
DCHECK_EQ(attached_windows_.size(), sizes.size());
int last = PrimaryAxisCoordinate(bounds->right(), bounds->bottom());
for (size_t i = 0; i < attached_windows_.size(); ++i) {
gfx::Rect attached_bounds(attached_windows_[i]->bounds());
if (details().window_component == HTRIGHT) {
attached_bounds.set_x(last);
attached_bounds.set_width(sizes[i]);
} else {
attached_bounds.set_y(last);
attached_bounds.set_height(sizes[i]);
}
attached_windows_[i]->SetBounds(attached_bounds);
last += sizes[i];
}
}
int WorkspaceWindowResizer::CalculateAttachedSizes(
int delta,
int available_size,
std::vector<int>* sizes) const {
std::vector<WindowSize> window_sizes;
CreateBucketsForAttached(&window_sizes);
// How much we need to grow the attached by (collectively).
int grow_attached_by = 0;
if (delta > 0) {
// If the attached windows don't fit when at their initial size, we will
// have to shrink them by how much they overflow.
if (total_initial_size_ >= available_size)
grow_attached_by = available_size - total_initial_size_;
} else {
// If we're shrinking, we grow the attached so the total size remains
// constant.
grow_attached_by = -delta;
}
int leftover_pixels = 0;
while (grow_attached_by != 0) {
int leftovers = GrowFairly(grow_attached_by, &window_sizes);
if (leftovers == grow_attached_by) {
leftover_pixels = leftovers;
break;
}
grow_attached_by = leftovers;
}
for (size_t i = 0; i < window_sizes.size(); ++i)
sizes->push_back(window_sizes[i].size());
return leftover_pixels;
}
int WorkspaceWindowResizer::GrowFairly(int pixels,
std::vector<WindowSize>* sizes) const {
bool shrinking = pixels < 0;
std::vector<WindowSize*> nonfull_windows;
for (size_t i = 0; i < sizes->size(); ++i) {
WindowSize& current_window_size = (*sizes)[i];
if (!current_window_size.is_at_capacity(shrinking))
nonfull_windows.push_back(&current_window_size);
}
std::vector<float> ratios;
CalculateGrowthRatios(nonfull_windows, &ratios);
int remaining_pixels = pixels;
bool add_leftover_pixels_to_last = true;
for (size_t i = 0; i < nonfull_windows.size(); ++i) {
int grow_by = pixels * ratios[i];
// Put any leftover pixels into the last window.
if (i == nonfull_windows.size() - 1 && add_leftover_pixels_to_last)
grow_by = remaining_pixels;
int remainder = nonfull_windows[i]->Add(grow_by);
int consumed = grow_by - remainder;
remaining_pixels -= consumed;
if (nonfull_windows[i]->is_at_capacity(shrinking) && remainder > 0) {
// Because this window overflowed, some of the pixels in
// |remaining_pixels| aren't there due to rounding errors. Rather than
// unfairly giving all those pixels to the last window, we refrain from
// allocating them so that this function can be called again to distribute
// the pixels fairly.
add_leftover_pixels_to_last = false;
}
}
return remaining_pixels;
}
void WorkspaceWindowResizer::CalculateGrowthRatios(
const std::vector<WindowSize*>& sizes,
std::vector<float>* out_ratios) const {
DCHECK(out_ratios->empty());
int total_value = 0;
for (size_t i = 0; i < sizes.size(); ++i)
total_value += sizes[i]->size();
for (size_t i = 0; i < sizes.size(); ++i)
out_ratios->push_back((static_cast<float>(sizes[i]->size())) / total_value);
}
void WorkspaceWindowResizer::CreateBucketsForAttached(
std::vector<WindowSize>* sizes) const {
for (size_t i = 0; i < attached_windows_.size(); i++) {
int initial_size = initial_size_[i];
aura::WindowDelegate* window_delegate = attached_windows_[i]->delegate();
int min = PrimaryAxisSize(
window_delegate ? window_delegate->GetMinimumSize() : gfx::Size());
int max = PrimaryAxisSize(
window_delegate ? window_delegate->GetMaximumSize() : gfx::Size());
sizes->push_back(WindowSize(initial_size, min, max));
}
}
void WorkspaceWindowResizer::MagneticallySnapToOtherWindows(gfx::Rect* bounds) {
if (UpdateMagnetismWindow(*bounds, kAllMagnetismEdges)) {
gfx::Rect bounds_in_screen = *bounds;
::wm::ConvertRectToScreen(GetTarget()->parent(), &bounds_in_screen);
gfx::Point point = OriginForMagneticAttach(
bounds_in_screen, magnetism_window_->GetBoundsInScreen(),
magnetism_edge_);
::wm::ConvertPointFromScreen(GetTarget()->parent(), &point);
bounds->set_origin(point);
}
}
void WorkspaceWindowResizer::MagneticallySnapResizeToOtherWindows(
gfx::Rect* bounds) {
const uint32_t edges =
WindowComponentToMagneticEdge(details().window_component);
if (UpdateMagnetismWindow(*bounds, edges)) {
gfx::Rect bounds_in_screen = *bounds;
::wm::ConvertRectToScreen(GetTarget()->parent(), &bounds_in_screen);
*bounds = BoundsForMagneticResizeAttach(
bounds_in_screen, magnetism_window_->GetBoundsInScreen(),
magnetism_edge_);
::wm::ConvertRectFromScreen(GetTarget()->parent(), bounds);
}
}
bool WorkspaceWindowResizer::UpdateMagnetismWindow(const gfx::Rect& bounds,
uint32_t edges) {
// |bounds| are in coordinates of original window's parent.
gfx::Rect bounds_in_screen = bounds;
::wm::ConvertRectToScreen(GetTarget()->parent(), &bounds_in_screen);
MagnetismMatcher matcher(bounds_in_screen, edges);
// If we snapped to a window then check it first. That way we don't bounce
// around when close to multiple edges.
if (magnetism_window_) {
if (window_tracker_.Contains(magnetism_window_) &&
matcher.ShouldAttach(magnetism_window_->GetBoundsInScreen(),
&magnetism_edge_)) {
return true;
}
window_tracker_.Remove(magnetism_window_);
magnetism_window_ = NULL;
}
// Avoid magnetically snapping windows that are not resizable.
// TODO(oshima): change this to window.type() == TYPE_NORMAL.
if (!window_state()->CanResize())
return false;
for (aura::Window* root_window : Shell::Get()->GetAllRootWindows()) {
// Test all children from the desktop in each root window.
const std::vector<aura::Window*>& children =
root_window->GetChildById(kShellWindowId_DefaultContainer)->children();
for (auto i = children.rbegin();
i != children.rend() && !matcher.AreEdgesObscured(); ++i) {
wm::WindowState* other_state = wm::GetWindowState(*i);
if (other_state->window() == GetTarget() ||
!other_state->window()->IsVisible() ||
!other_state->IsNormalOrSnapped() || !other_state->CanResize()) {
continue;
}
if (matcher.ShouldAttach(other_state->window()->GetBoundsInScreen(),
&magnetism_edge_)) {
magnetism_window_ = other_state->window();
window_tracker_.Add(magnetism_window_);
return true;
}
}
}
return false;
}
void WorkspaceWindowResizer::AdjustBoundsForMainWindow(int sticky_size,
gfx::Rect* bounds) {
gfx::Point last_mouse_location_in_screen = last_mouse_location_;
::wm::ConvertPointToScreen(GetTarget()->parent(),
&last_mouse_location_in_screen);
display::Display display =
display::Screen::GetScreen()->GetDisplayNearestPoint(
last_mouse_location_in_screen);
gfx::Rect work_area = display.work_area();
::wm::ConvertRectFromScreen(GetTarget()->parent(), &work_area);
if (details().window_component == HTCAPTION) {
// Adjust the bounds to the work area where the mouse cursor is located.
// Always keep kMinOnscreenHeight or the window height (whichever is less)
// on the bottom.
int max_y =
work_area.bottom() - std::min(kMinOnscreenHeight, bounds->height());
if (bounds->y() > max_y) {
bounds->set_y(max_y);
} else if (bounds->y() <= work_area.y()) {
// Don't allow dragging above the top of the display until the mouse
// cursor reaches the work area above if any.
bounds->set_y(work_area.y());
}
if (sticky_size > 0) {
// Possibly stick to edge except when a mouse pointer is outside the
// work area.
if (display.work_area().Contains(last_mouse_location_in_screen))
StickToWorkAreaOnMove(work_area, sticky_size, bounds);
MagneticallySnapToOtherWindows(bounds);
}
} else if (sticky_size > 0) {
MagneticallySnapResizeToOtherWindows(bounds);
if (!magnetism_window_ && sticky_size > 0)
StickToWorkAreaOnResize(work_area, sticky_size, bounds);
}
if (attached_windows_.empty())
return;
if (details().window_component == HTRIGHT) {
bounds->set_width(std::min(bounds->width(),
work_area.right() - total_min_ - bounds->x()));
} else {
DCHECK_EQ(HTBOTTOM, details().window_component);
bounds->set_height(std::min(bounds->height(),
work_area.bottom() - total_min_ - bounds->y()));
}
}
bool WorkspaceWindowResizer::StickToWorkAreaOnMove(const gfx::Rect& work_area,
int sticky_size,
gfx::Rect* bounds) const {
const int left_edge = work_area.x();
const int right_edge = work_area.right();
const int top_edge = work_area.y();
const int bottom_edge = work_area.bottom();
bool updated = false;
if (ShouldStickToEdge(bounds->x() - left_edge, sticky_size)) {
bounds->set_x(left_edge);
updated = true;
} else if (ShouldStickToEdge(right_edge - bounds->right(), sticky_size)) {
bounds->set_x(right_edge - bounds->width());
updated = true;
}
if (ShouldStickToEdge(bounds->y() - top_edge, sticky_size)) {
bounds->set_y(top_edge);
updated = true;
} else if (ShouldStickToEdge(bottom_edge - bounds->bottom(), sticky_size) &&
bounds->height() < (bottom_edge - top_edge)) {
// Only snap to the bottom if the window is smaller than the work area.
// Doing otherwise can lead to window snapping in weird ways as it bounces
// between snapping to top then bottom.
bounds->set_y(bottom_edge - bounds->height());
updated = true;
}
return updated;
}
void WorkspaceWindowResizer::StickToWorkAreaOnResize(const gfx::Rect& work_area,
int sticky_size,
gfx::Rect* bounds) const {
const uint32_t edges =
WindowComponentToMagneticEdge(details().window_component);
const int left_edge = work_area.x();
const int right_edge = work_area.right();
const int top_edge = work_area.y();
const int bottom_edge = work_area.bottom();
if (edges & MAGNETISM_EDGE_TOP &&
ShouldStickToEdge(bounds->y() - top_edge, sticky_size)) {
bounds->set_height(bounds->bottom() - top_edge);
bounds->set_y(top_edge);
}
if (edges & MAGNETISM_EDGE_LEFT &&
ShouldStickToEdge(bounds->x() - left_edge, sticky_size)) {
bounds->set_width(bounds->right() - left_edge);
bounds->set_x(left_edge);
}
if (edges & MAGNETISM_EDGE_BOTTOM &&
ShouldStickToEdge(bottom_edge - bounds->bottom(), sticky_size)) {
bounds->set_height(bottom_edge - bounds->y());
}
if (edges & MAGNETISM_EDGE_RIGHT &&
ShouldStickToEdge(right_edge - bounds->right(), sticky_size)) {
bounds->set_width(right_edge - bounds->x());
}
}
int WorkspaceWindowResizer::PrimaryAxisSize(const gfx::Size& size) const {
return PrimaryAxisCoordinate(size.width(), size.height());
}
int WorkspaceWindowResizer::PrimaryAxisCoordinate(int x, int y) const {
switch (details().window_component) {
case HTRIGHT:
return x;
case HTBOTTOM:
return y;
default:
NOTREACHED();
}
return 0;
}
void WorkspaceWindowResizer::UpdateSnapPhantomWindow(const gfx::Point& location,
const gfx::Rect& bounds) {
if (!did_move_or_resize_ || details().window_component != HTCAPTION)
return;
SnapType last_type = snap_type_;
snap_type_ = GetSnapType(location);
if (snap_type_ == SNAP_NONE || snap_type_ != last_type) {
snap_phantom_window_controller_.reset();
edge_cycler_.reset();
if (snap_type_ == SNAP_NONE)
return;
}
DCHECK(snap_type_ == SNAP_LEFT || snap_type_ == SNAP_RIGHT);
const bool can_snap = snap_type_ != SNAP_NONE && window_state()->CanSnap();
if (!can_snap) {
snap_type_ = SNAP_NONE;
snap_phantom_window_controller_.reset();
edge_cycler_.reset();
return;
}
if (!edge_cycler_) {
edge_cycler_.reset(new TwoStepEdgeCycler(
location, snap_type_ == SNAP_LEFT
? TwoStepEdgeCycler::DIRECTION_LEFT
: TwoStepEdgeCycler::DIRECTION_RIGHT));
} else {
edge_cycler_->OnMove(location);
}
// Update phantom window with snapped guide bounds.
const gfx::Rect phantom_bounds =
(snap_type_ == SNAP_LEFT)
? wm::GetDefaultLeftSnappedWindowBoundsInParent(GetTarget())
: wm::GetDefaultRightSnappedWindowBoundsInParent(GetTarget());
if (!snap_phantom_window_controller_) {
snap_phantom_window_controller_ =
std::make_unique<PhantomWindowController>(GetTarget());
}
gfx::Rect phantom_bounds_in_screen(phantom_bounds);
::wm::ConvertRectToScreen(GetTarget()->parent(), &phantom_bounds_in_screen);
snap_phantom_window_controller_->Show(phantom_bounds_in_screen);
}
void WorkspaceWindowResizer::RestackWindows() {
if (attached_windows_.empty())
return;
// Build a map from index in children to window, returning if there is a
// window with a different parent.
using IndexToWindowMap = std::map<size_t, aura::Window*>;
IndexToWindowMap map;
aura::Window* parent = GetTarget()->parent();
const std::vector<aura::Window*>& windows(parent->children());
map[std::find(windows.begin(), windows.end(), GetTarget()) -
windows.begin()] = GetTarget();
for (auto i = attached_windows_.begin(); i != attached_windows_.end(); ++i) {
if ((*i)->parent() != parent)
return;
size_t index =
std::find(windows.begin(), windows.end(), *i) - windows.begin();
map[index] = *i;
}
// Reorder the windows starting at the topmost.
parent->StackChildAtTop(map.rbegin()->second);
for (auto i = map.rbegin(); i != map.rend();) {
aura::Window* window = i->second;
++i;
if (i != map.rend())
parent->StackChildBelow(i->second, window);
}
}
WorkspaceWindowResizer::SnapType WorkspaceWindowResizer::GetSnapType(
const gfx::Point& location) const {
// TODO: this likely only wants total display area, not the area of a single
// display.
gfx::Rect area(screen_util::GetDisplayWorkAreaBoundsInParent(GetTarget()));
if (details().source == ::wm::WINDOW_MOVE_SOURCE_TOUCH) {
// Increase tolerance for touch-snapping near the screen edges. This is only
// necessary when the work area left or right edge is same as screen edge.
gfx::Rect display_bounds(
screen_util::GetDisplayBoundsInParent(GetTarget()));
int inset_left = 0;
if (area.x() == display_bounds.x())
inset_left = kScreenEdgeInsetForTouchDrag;
int inset_right = 0;
if (area.right() == display_bounds.right())
inset_right = kScreenEdgeInsetForTouchDrag;
area.Inset(inset_left, 0, inset_right, 0);
}
if (location.x() <= area.x())
return SNAP_LEFT;
if (location.x() >= area.right() - 1)
return SNAP_RIGHT;
return SNAP_NONE;
}
bool WorkspaceWindowResizer::AreBoundsValidSnappedBounds(
mojom::WindowStateType snapped_type,
const gfx::Rect& bounds_in_parent) const {
DCHECK(snapped_type == mojom::WindowStateType::LEFT_SNAPPED ||
snapped_type == mojom::WindowStateType::RIGHT_SNAPPED);
gfx::Rect snapped_bounds =
screen_util::GetDisplayWorkAreaBoundsInParent(GetTarget());
if (snapped_type == mojom::WindowStateType::RIGHT_SNAPPED)
snapped_bounds.set_x(snapped_bounds.right() - bounds_in_parent.width());
snapped_bounds.set_width(bounds_in_parent.width());
return bounds_in_parent == snapped_bounds;
}
void WorkspaceWindowResizer::SetWindowStateTypeFromGesture(
aura::Window* window,
mojom::WindowStateType new_state_type) {
wm::WindowState* window_state = wm::GetWindowState(window);
// TODO(oshima): Move extra logic (set_unminimize_to_restore_bounds,
// SetRestoreBoundsInParent) that modifies the window state
// into WindowState.
switch (new_state_type) {
case mojom::WindowStateType::MINIMIZED:
if (window_state->CanMinimize()) {
window_state->Minimize();
window_state->set_unminimize_to_restore_bounds(true);
window_state->SetRestoreBoundsInParent(pre_drag_window_bounds_);
}
break;
case mojom::WindowStateType::MAXIMIZED:
if (window_state->CanMaximize()) {
window_state->SetRestoreBoundsInParent(pre_drag_window_bounds_);
window_state->Maximize();
}
break;
case mojom::WindowStateType::LEFT_SNAPPED:
if (window_state->CanSnap()) {
window_state->SetRestoreBoundsInParent(pre_drag_window_bounds_);
const wm::WMEvent event(wm::WM_EVENT_SNAP_LEFT);
window_state->OnWMEvent(&event);
}
break;
case mojom::WindowStateType::RIGHT_SNAPPED:
if (window_state->CanSnap()) {
window_state->SetRestoreBoundsInParent(pre_drag_window_bounds_);
const wm::WMEvent event(wm::WM_EVENT_SNAP_RIGHT);
window_state->OnWMEvent(&event);
}
break;
default:
NOTREACHED();
}
}
} // namespace ash