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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/display/mouse_cursor_event_filter.h"
#include "ash/display/display_controller.h"
#include "ash/display/display_manager.h"
#include "ash/display/mirror_window_controller.h"
#include "ash/display/shared_display_edge_indicator.h"
#include "ash/screen_ash.h"
#include "ash/shell.h"
#include "ash/wm/coordinate_conversion.h"
#include "ash/wm/window_util.h"
#include "ui/aura/env.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/base/events/event.h"
#include "ui/base/layout.h"
#include "ui/compositor/dip_util.h"
#include "ui/gfx/screen.h"
namespace ash {
namespace internal {
namespace {
// Maximum size on the display edge that initiate snapping phantom window,
// from the corner of the display.
const int kMaximumSnapHeight = 16;
// Minimum height of an indicator on the display edge that allows
// dragging a window. If two displays shares the edge smaller than
// this, entire edge will be used as a draggable space.
const int kMinimumIndicatorHeight = 200;
const int kIndicatorThickness = 1;
}
MouseCursorEventFilter::MouseCursorEventFilter()
: mouse_warp_mode_(WARP_ALWAYS),
drag_source_root_(NULL),
shared_display_edge_indicator_(new SharedDisplayEdgeIndicator) {
}
MouseCursorEventFilter::~MouseCursorEventFilter() {
HideSharedEdgeIndicator();
}
void MouseCursorEventFilter::ShowSharedEdgeIndicator(
const aura::RootWindow* from) {
HideSharedEdgeIndicator();
if (Shell::GetScreen()->GetNumDisplays() <= 1 || from == NULL) {
src_indicator_bounds_.SetRect(0, 0, 0, 0);
dst_indicator_bounds_.SetRect(0, 0, 0, 0);
drag_source_root_ = NULL;
return;
}
drag_source_root_ = from;
DisplayLayout::Position position = Shell::GetInstance()->
display_manager()->GetCurrentDisplayLayout().position;
if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM)
UpdateHorizontalIndicatorWindowBounds();
else
UpdateVerticalIndicatorWindowBounds();
shared_display_edge_indicator_->Show(src_indicator_bounds_,
dst_indicator_bounds_);
}
void MouseCursorEventFilter::HideSharedEdgeIndicator() {
shared_display_edge_indicator_->Hide();
}
void MouseCursorEventFilter::OnMouseEvent(ui::MouseEvent* event) {
// Handle both MOVED and DRAGGED events here because when the mouse pointer
// enters the other root window while dragging, the underlying window system
// (at least X11) stops generating a ui::ET_MOUSE_MOVED event.
if (event->type() != ui::ET_MOUSE_MOVED &&
event->type() != ui::ET_MOUSE_DRAGGED) {
return;
}
Shell::GetInstance()->display_controller()->
mirror_window_controller()->UpdateCursorLocation();
gfx::Point point_in_screen(event->location());
aura::Window* target = static_cast<aura::Window*>(event->target());
wm::ConvertPointToScreen(target, &point_in_screen);
if (WarpMouseCursorIfNecessary(target->GetRootWindow(), point_in_screen))
event->StopPropagation();
}
bool MouseCursorEventFilter::WarpMouseCursorIfNecessary(
aura::RootWindow* target_root,
const gfx::Point& point_in_screen) {
if (Shell::GetScreen()->GetNumDisplays() <= 1 ||
mouse_warp_mode_ == WARP_NONE)
return false;
const float scale_at_target = ui::GetDeviceScaleFactor(target_root->layer());
aura::RootWindow* root_at_point = wm::GetRootWindowAt(point_in_screen);
gfx::Point point_in_root = point_in_screen;
wm::ConvertPointFromScreen(root_at_point, &point_in_root);
gfx::Rect root_bounds = root_at_point->bounds();
int offset_x = 0;
int offset_y = 0;
const float scale_at_point = ui::GetDeviceScaleFactor(root_at_point->layer());
// If the window is dragged from 2x display to 1x display, the
// pointer location is rounded by the source scale factor (2x) so
// it will never reach the edge (which is odd). Shrink by scale
// factor instead. Only integral scale factor is supported.
int shrink =
target_root != root_at_point && scale_at_target != scale_at_point ?
static_cast<int>(scale_at_target) : 1;
// Make the bounds inclusive to detect the edge.
root_bounds.Inset(0, 0, shrink, shrink);
if (point_in_root.x() <= root_bounds.x()) {
// Use -2, not -1, to avoid infinite loop of pointer warp.
offset_x = -2 * scale_at_target;
} else if (point_in_root.x() >= root_bounds.right()) {
offset_x = 2 * scale_at_target;
} else if (point_in_root.y() <= root_bounds.y()) {
offset_y = -2 * scale_at_target;
} else if (point_in_root.y() >= root_bounds.bottom()) {
offset_y = 2 * scale_at_target;
} else {
return false;
}
gfx::Point point_in_dst_screen(point_in_screen);
point_in_dst_screen.Offset(offset_x, offset_y);
aura::RootWindow* dst_root = wm::GetRootWindowAt(point_in_dst_screen);
// Warp the mouse cursor only if the location is in the indicator bounds
// or the mouse pointer is in the destination root.
if (mouse_warp_mode_ == WARP_DRAG &&
dst_root != drag_source_root_ &&
!src_indicator_bounds_.Contains(point_in_screen)) {
return false;
}
wm::ConvertPointFromScreen(dst_root, &point_in_dst_screen);
if (dst_root->bounds().Contains(point_in_dst_screen)) {
DCHECK_NE(dst_root, root_at_point);
dst_root->MoveCursorTo(point_in_dst_screen);
return true;
}
return false;
}
void MouseCursorEventFilter::UpdateHorizontalIndicatorWindowBounds() {
bool from_primary = Shell::GetPrimaryRootWindow() == drag_source_root_;
// GetPrimaryDisplay returns an object on stack, so copy the bounds
// instead of using reference.
const gfx::Rect primary_bounds =
Shell::GetScreen()->GetPrimaryDisplay().bounds();
const gfx::Rect secondary_bounds = ScreenAsh::GetSecondaryDisplay().bounds();
DisplayLayout::Position position = Shell::GetInstance()->
display_manager()->GetCurrentDisplayLayout().position;
src_indicator_bounds_.set_x(
std::max(primary_bounds.x(), secondary_bounds.x()));
src_indicator_bounds_.set_width(
std::min(primary_bounds.right(), secondary_bounds.right()) -
src_indicator_bounds_.x());
src_indicator_bounds_.set_height(kIndicatorThickness);
src_indicator_bounds_.set_y(
position == DisplayLayout::TOP ?
primary_bounds.y() - (from_primary ? 0 : kIndicatorThickness) :
primary_bounds.bottom() - (from_primary ? kIndicatorThickness : 0));
dst_indicator_bounds_ = src_indicator_bounds_;
dst_indicator_bounds_.set_height(kIndicatorThickness);
dst_indicator_bounds_.set_y(
position == DisplayLayout::TOP ?
primary_bounds.y() - (from_primary ? kIndicatorThickness : 0) :
primary_bounds.bottom() - (from_primary ? 0 : kIndicatorThickness));
}
void MouseCursorEventFilter::UpdateVerticalIndicatorWindowBounds() {
bool in_primary = Shell::GetPrimaryRootWindow() == drag_source_root_;
// GetPrimaryDisplay returns an object on stack, so copy the bounds
// instead of using reference.
const gfx::Rect primary_bounds =
Shell::GetScreen()->GetPrimaryDisplay().bounds();
const gfx::Rect secondary_bounds = ScreenAsh::GetSecondaryDisplay().bounds();
DisplayLayout::Position position = Shell::GetInstance()->
display_manager()->GetCurrentDisplayLayout().position;
int upper_shared_y = std::max(primary_bounds.y(), secondary_bounds.y());
int lower_shared_y = std::min(primary_bounds.bottom(),
secondary_bounds.bottom());
int shared_height = lower_shared_y - upper_shared_y;
int dst_x = position == DisplayLayout::LEFT ?
primary_bounds.x() - (in_primary ? kIndicatorThickness : 0) :
primary_bounds.right() - (in_primary ? 0 : kIndicatorThickness);
dst_indicator_bounds_.SetRect(
dst_x, upper_shared_y, kIndicatorThickness, shared_height);
// The indicator on the source display.
src_indicator_bounds_.set_width(kIndicatorThickness);
src_indicator_bounds_.set_x(
position == DisplayLayout::LEFT ?
primary_bounds.x() - (in_primary ? 0 : kIndicatorThickness) :
primary_bounds.right() - (in_primary ? kIndicatorThickness : 0));
const gfx::Rect& source_bounds =
in_primary ? primary_bounds : secondary_bounds;
int upper_indicator_y = source_bounds.y() + kMaximumSnapHeight;
int lower_indicator_y = std::min(source_bounds.bottom(), lower_shared_y);
// This gives a hight that can be used without sacrifying the snap space.
int available_space = lower_indicator_y -
std::max(upper_shared_y, upper_indicator_y);
if (shared_height < kMinimumIndicatorHeight) {
// If the shared height is smaller than minimum height, use the
// entire height.
upper_indicator_y = upper_shared_y;
} else if (available_space < kMinimumIndicatorHeight) {
// Snap to the bottom.
upper_indicator_y =
std::max(upper_shared_y, lower_indicator_y + kMinimumIndicatorHeight);
} else {
upper_indicator_y = std::max(upper_indicator_y, upper_shared_y);
}
src_indicator_bounds_.set_y(upper_indicator_y);
src_indicator_bounds_.set_height(lower_indicator_y - upper_indicator_y);
}
} // namespace internal
} // namespace ash
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