CrOS Tablet Window management - Split Screen part I

ash/wm/maximize_mode/maximize_mode_window_state.cc

 // Copyright 2014 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/maximize_mode/maximize_mode_window_state.h"
 
 #include <utility>
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
 #include "ash/wm/screen_pinning_controller.h"
+#include "ash/wm/splitview/split_view_controller.h"
 #include "ash/wm/window_animation_types.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_state_util.h"
 #include "ash/wm/wm_event.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace ash {
@@ skipping 36 matching lines @@
 
 // Returns the centered bounds of the given bounds in the work area.
 gfx::Rect GetCenteredBounds(const gfx::Rect& bounds_in_parent,
                             wm::WindowState* state_object) {
   gfx::Rect work_area_in_parent =
       ScreenUtil::GetDisplayWorkAreaBoundsInParent(state_object->window());
   work_area_in_parent.ClampToCenteredSize(bounds_in_parent.size());
   return work_area_in_parent;
 }
 
+// Returns true if the window can snap in maximized mode.
+bool CanSnap(wm::WindowState* window_state) {
+  // If split view mode is not allowed in maximized mode, do not allow snap

[varkha, 2017/06/30 14:29:34]

nit: 'do not snap the window' or 'do not allow snapping the window'

[xdai1, 2017/07/05 20:18:22]

Done.

+  // window.
+  if (!SplitViewController::ShouldAllowSplitView())
+    return false;
+  return window_state->CanSnap();
+}
+
 // Returns the maximized/full screen and/or centered bounds of a window.
 gfx::Rect GetBoundsInMaximizedMode(wm::WindowState* state_object) {
   if (state_object->IsFullscreen() || state_object->IsPinned())
     return ScreenUtil::GetDisplayBoundsInParent(state_object->window());
 
+  if (state_object->GetStateType() == wm::WINDOW_STATE_TYPE_LEFT_SNAPPED) {
+    DCHECK(CanSnap(state_object));
+    return Shell::Get()
+        ->split_view_controller()
+        ->GetSnappedWindowBoundsInParent(state_object->window(),
+                                         SplitViewController::LEFT_SNAPPED);
+  }
+
+  if (state_object->GetStateType() == wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED) {
+    DCHECK(CanSnap(state_object));
+    return Shell::Get()
+        ->split_view_controller()
+        ->GetSnappedWindowBoundsInParent(state_object->window(),
+                                         SplitViewController::RIGHT_SNAPPED);
+  }
+
   gfx::Rect bounds_in_parent;
   // Make the window as big as possible.
   if (state_object->CanMaximize() || state_object->CanResize()) {
     bounds_in_parent.set_size(GetMaximumSizeOfWindow(state_object));
   } else {
     // We prefer the user given window dimensions over the current windows
     // dimensions since they are likely to be the result from some other state
     // object logic.
     if (state_object->HasRestoreBounds())
       bounds_in_parent = state_object->GetRestoreBoundsInParent();
@@ skipping 77 matching lines @@
       if (!Shell::Get()->screen_pinning_controller()->IsPinned())
         UpdateWindow(window_state, wm::WINDOW_STATE_TYPE_TRUSTED_PINNED, true);
       break;
     case wm::WM_EVENT_TOGGLE_MAXIMIZE_CAPTION:
     case wm::WM_EVENT_TOGGLE_VERTICAL_MAXIMIZE:
     case wm::WM_EVENT_TOGGLE_HORIZONTAL_MAXIMIZE:
     case wm::WM_EVENT_TOGGLE_MAXIMIZE:
     case wm::WM_EVENT_CYCLE_SNAP_LEFT:
     case wm::WM_EVENT_CYCLE_SNAP_RIGHT:
     case wm::WM_EVENT_CENTER:
-    case wm::WM_EVENT_SNAP_LEFT:
-    case wm::WM_EVENT_SNAP_RIGHT:
     case wm::WM_EVENT_NORMAL:
     case wm::WM_EVENT_MAXIMIZE:
       UpdateWindow(window_state, GetMaximizedOrCenteredWindowType(window_state),
                    true);
       return;
+    case wm::WM_EVENT_SNAP_LEFT:
+      UpdateWindow(window_state,
+                   GetSnappedWindowStateType(
+                       window_state, wm::WINDOW_STATE_TYPE_LEFT_SNAPPED),
+                   true);
+      return;
+    case wm::WM_EVENT_SNAP_RIGHT:
+      UpdateWindow(window_state,
+                   GetSnappedWindowStateType(
+                       window_state, wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED),
+                   true);
+      return;
     case wm::WM_EVENT_MINIMIZE:
       UpdateWindow(window_state, wm::WINDOW_STATE_TYPE_MINIMIZED, true);
       return;
     case wm::WM_EVENT_SHOW_INACTIVE:
       return;
     case wm::WM_EVENT_SET_BOUNDS:
       if (current_state_type_ == wm::WINDOW_STATE_TYPE_MAXIMIZED) {
         // Having a maximized window, it could have been created with an empty
         // size and the caller should get his size upon leaving the maximized
         // mode. As such we set the restore bounds to the requested bounds.
         gfx::Rect bounds_in_parent =
             (static_cast<const wm::SetBoundsEvent*>(event))->requested_bounds();
         if (!bounds_in_parent.IsEmpty())
           window_state->SetRestoreBoundsInParent(bounds_in_parent);
       } else if (current_state_type_ != wm::WINDOW_STATE_TYPE_MINIMIZED &&
                  current_state_type_ != wm::WINDOW_STATE_TYPE_FULLSCREEN &&
                  current_state_type_ != wm::WINDOW_STATE_TYPE_PINNED &&
-                 current_state_type_ != wm::WINDOW_STATE_TYPE_TRUSTED_PINNED) {
+                 current_state_type_ != wm::WINDOW_STATE_TYPE_TRUSTED_PINNED &&
+                 current_state_type_ != wm::WINDOW_STATE_TYPE_LEFT_SNAPPED &&
+                 current_state_type_ != wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED) {
         // In all other cases (except for minimized windows) we respect the
         // requested bounds and center it to a fully visible area on the screen.
         gfx::Rect bounds_in_parent =
             (static_cast<const wm::SetBoundsEvent*>(event))->requested_bounds();
         bounds_in_parent = GetCenteredBounds(bounds_in_parent, window_state);
         if (bounds_in_parent != window_state->window()->bounds()) {
           if (window_state->window()->IsVisible())
             window_state->SetBoundsDirectAnimated(bounds_in_parent);
           else
             window_state->SetBoundsDirect(bounds_in_parent);
@@ skipping 60 matching lines @@
 
 void MaximizeModeWindowState::UpdateWindow(wm::WindowState* window_state,
                                            wm::WindowStateType target_state,
                                            bool animated) {
   DCHECK(target_state == wm::WINDOW_STATE_TYPE_MINIMIZED ||
          target_state == wm::WINDOW_STATE_TYPE_MAXIMIZED ||
          target_state == wm::WINDOW_STATE_TYPE_PINNED ||
          target_state == wm::WINDOW_STATE_TYPE_TRUSTED_PINNED ||
          (target_state == wm::WINDOW_STATE_TYPE_NORMAL &&
           !window_state->CanMaximize()) ||
-         target_state == wm::WINDOW_STATE_TYPE_FULLSCREEN);
+         target_state == wm::WINDOW_STATE_TYPE_FULLSCREEN ||
+         target_state == wm::WINDOW_STATE_TYPE_LEFT_SNAPPED ||
+         target_state == wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED);
 
   if (current_state_type_ == target_state) {
     if (target_state == wm::WINDOW_STATE_TYPE_MINIMIZED)
       return;
     // If the state type did not change, update it accordingly.
     UpdateBounds(window_state, animated);
     return;
   }
 
   const wm::WindowStateType old_state_type = current_state_type_;
   current_state_type_ = target_state;
   window_state->UpdateWindowPropertiesFromStateType();
   window_state->NotifyPreStateTypeChange(old_state_type);
 
   if (target_state == wm::WINDOW_STATE_TYPE_MINIMIZED) {
     ::wm::SetWindowVisibilityAnimationType(
         window_state->window(), wm::WINDOW_VISIBILITY_ANIMATION_TYPE_MINIMIZE);
     window_state->window()->Hide();
     if (window_state->IsActive())
       window_state->Deactivate();
+  } else if (target_state == wm::WINDOW_STATE_TYPE_LEFT_SNAPPED) {
+    window_state->SetBoundsDirectAnimated(
+        Shell::Get()->split_view_controller()->GetSnappedWindowBoundsInParent(
+            window_state->window(), SplitViewController::LEFT_SNAPPED));
+  } else if (target_state == wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED) {
+    window_state->SetBoundsDirectAnimated(
+        Shell::Get()->split_view_controller()->GetSnappedWindowBoundsInParent(
+            window_state->window(), SplitViewController::RIGHT_SNAPPED));
   } else {
     UpdateBounds(window_state, animated);
   }
 
   window_state->NotifyPostStateTypeChange(old_state_type);
 
   if (old_state_type == wm::WINDOW_STATE_TYPE_PINNED ||
       target_state == wm::WINDOW_STATE_TYPE_PINNED ||
       old_state_type == wm::WINDOW_STATE_TYPE_TRUSTED_PINNED ||
       target_state == wm::WINDOW_STATE_TYPE_TRUSTED_PINNED) {
     Shell::Get()->screen_pinning_controller()->SetPinnedWindow(
         window_state->window());
   }
 
   if ((window_state->window()->layer()->GetTargetVisibility() ||
        old_state_type == wm::WINDOW_STATE_TYPE_MINIMIZED) &&
       !window_state->window()->layer()->visible()) {
     // The layer may be hidden if the window was previously minimized. Make
     // sure it's visible.
     window_state->window()->Show();
   }
 }
 
 wm::WindowStateType MaximizeModeWindowState::GetMaximizedOrCenteredWindowType(
     wm::WindowState* window_state) {
   return window_state->CanMaximize() ? wm::WINDOW_STATE_TYPE_MAXIMIZED
                                      : wm::WINDOW_STATE_TYPE_NORMAL;
 }
 
+wm::WindowStateType MaximizeModeWindowState::GetSnappedWindowStateType(
+    wm::WindowState* window_state,
+    wm::WindowStateType target_state) {
+  DCHECK(target_state == wm::WINDOW_STATE_TYPE_LEFT_SNAPPED ||
+         target_state == wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED);
+  return CanSnap(window_state) ? target_state
+                               : GetMaximizedOrCenteredWindowType(window_state);
+}
+
 void MaximizeModeWindowState::UpdateBounds(wm::WindowState* window_state,
                                            bool animated) {
   if (defer_bounds_updates_)
     return;
   gfx::Rect bounds_in_parent = GetBoundsInMaximizedMode(window_state);
   // If we have a target bounds rectangle, we center it and set it
   // accordingly.
   if (!bounds_in_parent.IsEmpty() &&
       bounds_in_parent != window_state->window()->bounds()) {
     if (current_state_type_ == wm::WINDOW_STATE_TYPE_MINIMIZED ||
         !window_state->window()->IsVisible() || !animated) {
       window_state->SetBoundsDirect(bounds_in_parent);
     } else {
       // If we animate (to) maximized mode, we want to use the cross fade to
       // avoid flashing.
       if (window_state->IsMaximized())
         window_state->SetBoundsDirectCrossFade(bounds_in_parent);
       else
         window_state->SetBoundsDirectAnimated(bounds_in_parent);
     }
   }
 }
 
 }  // namespace ash