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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/display/extended_mouse_warp_controller.h"
#include <cmath>
#include <memory>
#include "ash/display/display_util.h"
#include "ash/display/shared_display_edge_indicator.h"
#include "ash/display/window_tree_host_manager.h"
#include "ash/host/ash_window_tree_host.h"
#include "ash/root_window_controller.h"
#include "ash/shell.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/display/display_layout.h"
#include "ui/display/manager/display_manager.h"
#include "ui/display/manager/util/display_manager_util.h"
#include "ui/display/screen.h"
#include "ui/display/types/display_constants.h"
#include "ui/events/event_utils.h"
#include "ui/wm/core/coordinate_conversion.h"
namespace ash {
namespace {
// Maximum size on the display edge that initiate snapping phantom window,
// from the corner of the display.
constexpr int kMaximumSnapHeight = 32;
// 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.
constexpr int kMinimumIndicatorHeight = 200;
// Helper method that maps an aura::Window to display id;
int64_t GetDisplayIdFromWindow(aura::Window* window) {
return display::Screen::GetScreen()->GetDisplayNearestWindow(window).id();
}
// Adjust the edge so that it has |barrier_size| gap at the top to
// trigger snap window action.
void AdjustSourceEdgeBounds(const gfx::Rect& display_bounds,
int barrier_size,
gfx::Rect* edge) {
DCHECK_GT(edge->height(), edge->width());
int target_y = display_bounds.y() + barrier_size;
if (target_y < edge->y())
return;
int available_height = edge->height() - kMinimumIndicatorHeight;
if (available_height <= 0)
return;
edge->Inset(
gfx::Insets().set_top(std::min(available_height, target_y - edge->y())));
}
} // namespace
ExtendedMouseWarpController::WarpRegion::WarpRegion(
int64_t a_display_id,
int64_t b_display_id,
const gfx::Rect& a_indicator_bounds,
const gfx::Rect& b_indicator_bounds)
: a_display_id_(a_display_id),
b_display_id_(b_display_id),
a_indicator_bounds_(a_indicator_bounds),
b_indicator_bounds_(b_indicator_bounds),
shared_display_edge_indicator_(nullptr) {
// Initialize edge bounds from indicator bounds.
aura::Window* a_window = Shell::GetRootWindowForDisplayId(a_display_id);
aura::Window* b_window = Shell::GetRootWindowForDisplayId(b_display_id);
AshWindowTreeHost* a_ash_host =
RootWindowController::ForWindow(a_window)->ash_host();
AshWindowTreeHost* b_ash_host =
RootWindowController::ForWindow(b_window)->ash_host();
a_edge_bounds_in_native_ =
GetNativeEdgeBounds(a_ash_host, a_indicator_bounds);
b_edge_bounds_in_native_ =
GetNativeEdgeBounds(b_ash_host, b_indicator_bounds);
}
ExtendedMouseWarpController::WarpRegion::~WarpRegion() = default;
const gfx::Rect&
ExtendedMouseWarpController::WarpRegion::GetIndicatorBoundsForTest(
int64_t id) const {
if (a_display_id_ == id)
return a_indicator_bounds_;
DCHECK_EQ(b_display_id_, id);
return b_indicator_bounds_;
}
const gfx::Rect&
ExtendedMouseWarpController::WarpRegion::GetIndicatorNativeBoundsForTest(
int64_t id) const {
if (a_display_id_ == id)
return a_edge_bounds_in_native_;
DCHECK_EQ(b_display_id_, id);
return b_edge_bounds_in_native_;
}
ExtendedMouseWarpController::ExtendedMouseWarpController(
aura::Window* drag_source)
: drag_source_root_(drag_source), allow_non_native_event_(false) {
display::DisplayManager* display_manager = Shell::Get()->display_manager();
int64_t drag_source_id = drag_source ? GetDisplayIdFromWindow(drag_source)
: display::kInvalidDisplayId;
display::Displays display_list = display_manager->active_display_list();
// Try to create a Warp region for all possible two displays combination.
// The following code does it by poping the last element in the list
// and then pairing with remaining displays in the list, until the list
// becomes single element.
while (display_list.size() > 1) {
display::Display display = display_list.back();
display_list.pop_back();
for (const display::Display& peer : display_list) {
std::unique_ptr<WarpRegion> region =
CreateWarpRegion(display, peer, drag_source_id);
if (region)
AddWarpRegion(std::move(region), drag_source != nullptr);
}
}
}
ExtendedMouseWarpController::~ExtendedMouseWarpController() = default;
bool ExtendedMouseWarpController::WarpMouseCursor(ui::MouseEvent* event) {
if (display::Screen::GetScreen()->GetNumDisplays() <= 1 || !enabled_)
return false;
aura::Window* target = static_cast<aura::Window*>(event->target());
gfx::Point point_in_screen = event->location();
::wm::ConvertPointToScreen(target, &point_in_screen);
// A native event may not exist in unit test. Generate the native point
// from the screen point instead.
if (!event->HasNativeEvent()) {
if (!allow_non_native_event_)
return false;
aura::Window* target_root = target->GetRootWindow();
gfx::Point point_in_native = point_in_screen;
::wm::ConvertPointFromScreen(target_root, &point_in_native);
target_root->GetHost()->ConvertDIPToScreenInPixels(&point_in_native);
return WarpMouseCursorInNativeCoords(point_in_native, point_in_screen,
true);
}
gfx::Point point_in_native =
ui::EventSystemLocationFromNative(event->native_event());
// TODO(dnicoara): crbug.com/415680 Move cursor warping into Ozone once Ozone
// has access to the logical display layout.
// Native events in Ozone are in the native window coordinate system. We need
// to translate them to get the global position.
point_in_native.Offset(target->GetHost()->GetBoundsInPixels().x(),
target->GetHost()->GetBoundsInPixels().y());
return WarpMouseCursorInNativeCoords(point_in_native, point_in_screen, false);
}
void ExtendedMouseWarpController::SetEnabled(bool enabled) {
enabled_ = enabled;
}
void ExtendedMouseWarpController::AddWarpRegion(
std::unique_ptr<WarpRegion> warp_region,
bool has_drag_source) {
if (has_drag_source) {
warp_region->shared_display_edge_indicator_ =
std::make_unique<SharedDisplayEdgeIndicator>();
warp_region->shared_display_edge_indicator_->Show(
warp_region->a_indicator_bounds_, warp_region->b_indicator_bounds_);
}
warp_regions_.emplace_back(std::move(warp_region));
}
bool ExtendedMouseWarpController::WarpMouseCursorInNativeCoords(
const gfx::Point& point_in_native,
const gfx::Point& point_in_screen,
bool update_mouse_location_now) {
for (const std::unique_ptr<WarpRegion>& warp : warp_regions_) {
bool in_a_edge = warp->a_edge_bounds_in_native_.Contains(point_in_native);
bool in_b_edge = warp->b_edge_bounds_in_native_.Contains(point_in_native);
if (!in_a_edge && !in_b_edge)
continue;
// The mouse must move.
aura::Window* dst_window = Shell::GetRootWindowForDisplayId(
in_a_edge ? warp->b_display_id_ : warp->a_display_id_);
aura::Window* src_window = Shell::GetRootWindowForDisplayId(
in_a_edge ? warp->a_display_id_ : warp->b_display_id_);
AshWindowTreeHost* target_ash_host =
RootWindowController::ForWindow(dst_window)->ash_host();
AshWindowTreeHost* src_ash_host =
RootWindowController::ForWindow(src_window)->ash_host();
src_ash_host->AsWindowTreeHost()->dispatcher()->OnHostCursorExit();
MoveCursorTo(target_ash_host, point_in_screen, update_mouse_location_now);
return true;
}
return false;
}
std::unique_ptr<ExtendedMouseWarpController::WarpRegion>
ExtendedMouseWarpController::CreateWarpRegion(const display::Display& a,
const display::Display& b,
int64_t drag_source_id) {
gfx::Rect a_edge;
gfx::Rect b_edge;
int snap_barrier =
drag_source_id == display::kInvalidDisplayId ? 0 : kMaximumSnapHeight;
if (!display::ComputeBoundary(a, b, &a_edge, &b_edge))
return nullptr;
// Creates the snap window barrirer only when horizontally connected.
if (a_edge.height() > a_edge.width()) {
if (drag_source_id == a.id())
AdjustSourceEdgeBounds(a.bounds(), snap_barrier, &a_edge);
else if (drag_source_id == b.id())
AdjustSourceEdgeBounds(b.bounds(), snap_barrier, &b_edge);
}
return std::make_unique<WarpRegion>(a.id(), b.id(), a_edge, b_edge);
}
} // namespace ash
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