Index: ash/wm/splitview/split_view_controller.cc |
diff --git a/ash/wm/splitview/split_view_controller.cc b/ash/wm/splitview/split_view_controller.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..82313a2f18b3b3114e9b86365535056e5e2dd671 |
--- /dev/null |
+++ b/ash/wm/splitview/split_view_controller.cc |
@@ -0,0 +1,356 @@ |
+// Copyright 2017 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/splitview/split_view_controller.h" |
+ |
+#include "ash/ash_switches.h" |
+#include "ash/public/cpp/shell_window_ids.h" |
+#include "ash/screen_util.h" |
+#include "ash/shell.h" |
+#include "ash/wm/maximize_mode/maximize_mode_controller.h" |
+#include "ash/wm/mru_window_tracker.h" |
+#include "ash/wm/window_state.h" |
+#include "ash/wm/window_util.h" |
+#include "ash/wm/wm_event.h" |
+#include "base/command_line.h" |
+#include "ui/aura/window.h" |
+#include "ui/wm/core/coordinate_conversion.h" |
+#include "ui/wm/public/activation_client.h" |
+ |
+namespace ash { |
+ |
+namespace { |
+ |
+// Returns true if |window| can be activated and snapped. |
+bool CanSnap(aura::Window* window) { |
+ if (!wm::CanActivateWindow(window)) |
+ return false; |
+ return wm::GetWindowState(window)->CanSnap(); |
+} |
+ |
+} // namespace |
+ |
+SplitViewController::SplitViewController() { |
+ Shell::Get()->AddShellObserver(this); |
+ Shell::Get()->activation_client()->AddObserver(this); |
+} |
+ |
+SplitViewController::~SplitViewController() { |
+ Shell::Get()->RemoveShellObserver(this); |
+ Shell::Get()->activation_client()->RemoveObserver(this); |
+ EndSplitView(); |
+} |
+ |
+// static |
+bool SplitViewController::ShouldAllowSplitView() { |
+ if (!base::CommandLine::ForCurrentProcess()->HasSwitch( |
+ switches::kAshEnableTabletSplitView)) { |
+ return false; |
+ } |
+ if (!Shell::Get() |
+ ->maximize_mode_controller() |
+ ->IsMaximizeModeWindowManagerEnabled()) { |
+ return false; |
+ } |
+ return true; |
+} |
+ |
+bool SplitViewController::IsSplitViewModeActive() const { |
+ return state_ != NOSNAP; |
+} |
+ |
+void SplitViewController::SetLeftWindow(aura::Window* left_window) { |
+ if (!left_window) |
+ return; |
+ |
+ if (state_ == NOSNAP) |
+ Shell::Get()->NotifySplitViewModeStarting(); |
+ |
+ if (right_window_ == left_window) { |
+ StopObserving(right_window_); |
+ right_window_ = nullptr; |
+ } |
+ if (left_window_ != left_window) { |
+ StopObserving(left_window_); |
+ left_window_ = nullptr; |
+ left_window_ = left_window; |
+ left_window_->AddObserver(this); |
+ wm::GetWindowState(left_window_)->AddObserver(this); |
+ } |
+ |
+ State previous_state = state_; |
+ switch (state_) { |
+ case NOSNAP: |
+ default_snap_position_ = LEFT; |
+ state_ = LEFT_SNAPPED; |
+ break; |
+ case LEFT_SNAPPED: |
+ state_ = LEFT_SNAPPED; |
+ break; |
+ case RIGHT_SNAPPED: |
+ case BOTH_SNAPPED: |
+ state_ = BOTH_SNAPPED; |
+ break; |
+ } |
+ |
+ const wm::WMEvent event(wm::WM_EVENT_SNAP_LEFT); |
+ wm::GetWindowState(left_window_)->OnWMEvent(&event); |
+ wm::ActivateWindow(left_window_); |
+ |
+ NotifySplitViewStateChanged(previous_state, state_); |
+} |
+ |
+void SplitViewController::SetRightWindow(aura::Window* right_window) { |
+ if (!right_window) |
+ return; |
+ |
+ if (state_ == NOSNAP) |
+ Shell::Get()->NotifySplitViewModeStarting(); |
+ |
+ if (left_window_ == right_window) { |
+ StopObserving(left_window_); |
+ left_window_ = nullptr; |
+ } |
+ if (right_window_ != right_window) { |
+ StopObserving(right_window_); |
+ right_window_ = nullptr; |
+ right_window_ = right_window; |
+ right_window_->AddObserver(this); |
+ wm::GetWindowState(right_window_)->AddObserver(this); |
+ } |
+ |
+ State previous_state = state_; |
+ switch (state_) { |
+ case NOSNAP: |
+ default_snap_position_ = RIGHT; |
+ state_ = RIGHT_SNAPPED; |
+ break; |
+ case RIGHT_SNAPPED: |
+ state_ = RIGHT_SNAPPED; |
+ break; |
+ case LEFT_SNAPPED: |
+ case BOTH_SNAPPED: |
+ state_ = BOTH_SNAPPED; |
+ break; |
+ } |
+ |
+ const wm::WMEvent event(wm::WM_EVENT_SNAP_RIGHT); |
+ wm::GetWindowState(right_window_)->OnWMEvent(&event); |
+ wm::ActivateWindow(right_window_); |
+ |
+ NotifySplitViewStateChanged(previous_state, state_); |
+} |
+ |
+aura::Window* SplitViewController::GetDefaultSnappedWindow() { |
+ if (default_snap_position_ == LEFT) |
+ return left_window_; |
+ if (default_snap_position_ == RIGHT) |
+ return right_window_; |
+ return nullptr; |
+} |
+ |
+gfx::Rect SplitViewController::GetSnappedWindowBoundsInParent( |
+ aura::Window* window, |
+ State snap_state) { |
+ if (snap_state == LEFT_SNAPPED) |
+ return GetLeftWindowBoundsInParent(window); |
+ else if (snap_state == RIGHT_SNAPPED) |
+ return GetRightWindowBoundsInParent(window); |
+ |
+ NOTREACHED(); |
+ return gfx::Rect(); |
+} |
+ |
+gfx::Rect SplitViewController::GetSnappedWindowBoundsInScreen( |
+ aura::Window* window, |
+ State snap_state) { |
+ if (snap_state == LEFT_SNAPPED) |
+ return GetLeftWindowBoundsInScreen(window); |
+ else if (snap_state == RIGHT_SNAPPED) |
+ return GetRightWindowBoundsInScreen(window); |
+ |
+ NOTREACHED(); |
+ return gfx::Rect(); |
+} |
+ |
+gfx::Rect SplitViewController::GetDisplayWorkAreaBoundsInParent( |
+ aura::Window* window) { |
+ aura::Window* root_window = window->GetRootWindow(); |
+ gfx::Rect bounds_in_parent = ScreenUtil::GetDisplayWorkAreaBoundsInParent( |
+ root_window->GetChildById(kShellWindowId_DefaultContainer)); |
+ return bounds_in_parent; |
+} |
+ |
+gfx::Rect SplitViewController::GetDisplayWorkAreaBoundsInScreen( |
+ aura::Window* window) { |
+ gfx::Rect bounds = GetDisplayWorkAreaBoundsInParent(window); |
+ ::wm::ConvertRectToScreen(window->GetRootWindow(), &bounds); |
+ return bounds; |
+} |
+ |
+void SplitViewController::AddObserver(Observer* observer) { |
+ observers_.AddObserver(observer); |
+} |
+ |
+void SplitViewController::RemoveObserver(Observer* observer) { |
+ observers_.RemoveObserver(observer); |
+} |
+ |
+void SplitViewController::OnWindowDestroying(aura::Window* window) { |
+ // If one of the snapped window gets closed, end the split view mode. The |
+ // behavior might change in the future. |
+ DCHECK(window == left_window_ || window == right_window_); |
+ EndSplitView(); |
+} |
+ |
+void SplitViewController::OnPostWindowStateTypeChange( |
+ ash::wm::WindowState* window_state, |
+ ash::wm::WindowStateType old_type) { |
+ if (window_state->IsFullscreen() || window_state->IsMinimized() || |
+ window_state->IsMaximized()) { |
+ // TODO(xdai): Decide what to do if one of the snapped windows gets |
+ // minimized /maximized / full-screened. For now we end the split view mode |
+ // for simplicity. |
+ EndSplitView(); |
+ } |
+} |
+ |
+void SplitViewController::OnWindowActivated(ActivationReason reason, |
+ aura::Window* gained_active, |
+ aura::Window* lost_active) { |
+ if (!IsSplitViewModeActive()) |
+ return; |
+ |
+ // If |gained_active| was activated as a side effect of a window disposition |
+ // change, do nothing. For example, when a snapped window is closed, another |
+ // window will be activated before OnWindowDestroying() is called. We should |
+ // not try to snap another window in this case. |
+ if (reason == ActivationReason::WINDOW_DISPOSITION_CHANGED) |
+ return; |
+ |
+ // Only snap window that can be snapped but hasn't been snapped. |
+ if (!gained_active || gained_active == left_window_ || |
+ gained_active == right_window_ || !CanSnap(gained_active)) { |
+ return; |
+ } |
+ |
+ // Only window in MRU list can be snapped. |
+ aura::Window::Windows windows = |
+ Shell::Get()->mru_window_tracker()->BuildMruWindowList(); |
+ if (std::find(windows.begin(), windows.end(), gained_active) == windows.end()) |
+ return; |
+ |
+ // Snap the window on the non-default side of the screen if split view mode |
+ // is active. |
+ if (default_snap_position_ == LEFT) |
+ SetRightWindow(gained_active); |
+ else |
+ SetLeftWindow(gained_active); |
+} |
+ |
+void SplitViewController::OnOverviewModeStarting() { |
+ // If split view mode is active, reset |state_| to make it be able to select |
+ // another window from overview window grid. |
+ if (IsSplitViewModeActive()) { |
+ DCHECK(state_ == BOTH_SNAPPED); |
+ if (default_snap_position_ == LEFT) { |
+ StopObserving(right_window_); |
+ state_ = LEFT_SNAPPED; |
+ } else { |
+ StopObserving(left_window_); |
+ state_ = RIGHT_SNAPPED; |
+ } |
+ NotifySplitViewStateChanged(BOTH_SNAPPED, state_); |
+ } |
+} |
+ |
+void SplitViewController::OnOverviewModeEnded() { |
+ // If split view mode is active but only has one snapped window, use the MRU |
+ // window list to auto select another window to snap. |
+ if (IsSplitViewModeActive() && state_ != BOTH_SNAPPED) { |
+ aura::Window::Windows windows = |
+ Shell::Get()->mru_window_tracker()->BuildMruWindowList(); |
+ auto end = std::remove_if(windows.begin(), windows.end(), |
+ std::not1(std::ptr_fun(&CanSnap))); |
+ windows.resize(end - windows.begin()); |
+ for (auto* window : windows) { |
+ if (window != GetDefaultSnappedWindow()) { |
+ if (default_snap_position_ == LEFT) |
+ SetRightWindow(window); |
+ else |
+ SetLeftWindow(window); |
+ break; |
+ } |
+ } |
+ } |
+} |
+ |
+void SplitViewController::EndSplitView() { |
+ StopObserving(left_window_); |
+ StopObserving(right_window_); |
+ left_window_ = nullptr; |
+ right_window_ = nullptr; |
+ default_snap_position_ = LEFT; |
+ separator_position_ = -1; |
+ |
+ State previous_state = state_; |
+ state_ = NOSNAP; |
+ NotifySplitViewStateChanged(previous_state, state_); |
+ |
+ Shell::Get()->NotifySplitViewModeEnded(); |
+} |
+ |
+void SplitViewController::StopObserving(aura::Window* window) { |
+ if (window) { |
+ window->RemoveObserver(this); |
+ if (wm::GetWindowState(window)) |
+ wm::GetWindowState(window)->RemoveObserver(this); |
+ } |
+} |
+ |
+void SplitViewController::NotifySplitViewStateChanged(State previous_state, |
+ State state) { |
+ if (previous_state == state) |
+ return; |
+ for (Observer& observer : observers_) |
+ observer.OnSplitViewStateChanged(previous_state, state); |
+} |
+ |
+gfx::Rect SplitViewController::GetLeftWindowBoundsInParent( |
+ aura::Window* window) { |
+ gfx::Rect bounds_in_parent = GetDisplayWorkAreaBoundsInParent(window); |
+ if (separator_position_ < 0) |
+ separator_position_ = bounds_in_parent.width() * 0.5f; |
+ gfx::Rect bounds(bounds_in_parent.x(), bounds_in_parent.y(), |
+ separator_position_, bounds_in_parent.height()); |
+ return bounds; |
+} |
+ |
+gfx::Rect SplitViewController::GetRightWindowBoundsInParent( |
+ aura::Window* window) { |
+ gfx::Rect bounds_in_parent = GetDisplayWorkAreaBoundsInParent(window); |
+ if (separator_position_ < 0) |
+ separator_position_ = bounds_in_parent.width() * 0.5f; |
+ gfx::Rect bounds(bounds_in_parent.x() + separator_position_, |
+ bounds_in_parent.y(), |
+ bounds_in_parent.width() - separator_position_, |
+ bounds_in_parent.height()); |
+ return bounds; |
+} |
+ |
+gfx::Rect SplitViewController::GetLeftWindowBoundsInScreen( |
+ aura::Window* window) { |
+ gfx::Rect bounds = GetLeftWindowBoundsInParent(window); |
+ ::wm::ConvertRectToScreen(window->GetRootWindow(), &bounds); |
+ return bounds; |
+} |
+ |
+gfx::Rect SplitViewController::GetRightWindowBoundsInScreen( |
+ aura::Window* window) { |
+ gfx::Rect bounds = GetRightWindowBoundsInParent(window); |
+ ::wm::ConvertRectToScreen(window->GetRootWindow(), &bounds); |
+ return bounds; |
+} |
+ |
+} // namespace ash |