Athena AppActivities should open maximized unless they specify otherwise.

Selecting an app window from the overview mode maximizes the window only if it's maximizable.

A change proposal to fix the below 2 bugs: - crbug.com/424710 - crbug.com/424708

R=oshima@chromium.org
BUG=424710,424708
TEST=Manual & athena_unittests @ OnSelectWindow

Review URL: https://codereview.chromium.org/668513003

Cr-Commit-Position: refs/heads/master@{#301438}

4 files changed, 110 insertions, 6 deletions

diff --git a/athena/activity/activity_widget_delegate.cc b/athena/activity/activity_widget_delegate.cc
index 3c638e8..b387b50 100644
--- a/athena/activity/activity_widget_delegate.cc
+++ b/athena/activity/activity_widget_delegate.cc
@@ -18,6 +18,18 @@ ActivityWidgetDelegate::ActivityWidgetDelegate(ActivityViewModel* view_model)
 ActivityWidgetDelegate::~ActivityWidgetDelegate() {
 }
 
+bool ActivityWidgetDelegate::CanResize() const {
+  return true;
+}
+
+bool ActivityWidgetDelegate::CanMaximize() const {
+  return true;
+}
+
+bool ActivityWidgetDelegate::CanMinimize() const {
+  return true;
+}
+
 base::string16 ActivityWidgetDelegate::GetWindowTitle() const {
   return view_model_->GetTitle();
 }
diff --git a/athena/activity/activity_widget_delegate.h b/athena/activity/activity_widget_delegate.h
index 7dbedef..93829b6 100644
--- a/athena/activity/activity_widget_delegate.h
+++ b/athena/activity/activity_widget_delegate.h
@@ -19,6 +19,9 @@ class ActivityWidgetDelegate : public views::WidgetDelegate {
   ~ActivityWidgetDelegate() override;
 
   // views::WidgetDelegate:
+  bool CanResize() const override;
+  bool CanMaximize() const override;
+  bool CanMinimize() const override;
   base::string16 GetWindowTitle() const override;
   void DeleteDelegate() override;
   views::Widget* GetWidget() override;
diff --git a/athena/wm/window_manager_impl.cc b/athena/wm/window_manager_impl.cc
index c8c1cac..1392133 100644
--- a/athena/wm/window_manager_impl.cc
+++ b/athena/wm/window_manager_impl.cc
@@ -16,8 +16,10 @@
 #include "athena/wm/window_overview_mode.h"
 #include "base/bind.h"
 #include "base/logging.h"
+#include "ui/aura/client/aura_constants.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
+#include "ui/aura/window_delegate.h"
 #include "ui/compositor/closure_animation_observer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/display.h"
@@ -40,6 +42,16 @@ void SetWindowState(aura::Window* window,
   window->SetTransform(transform);
 }
 
+// Tests whether the given window can be maximized
+bool CanWindowMaximize(const aura::Window* const window) {
+  const aura::WindowDelegate* delegate = window->delegate();
+  const bool no_max_size =
+      !delegate || delegate->GetMaximumSize().IsEmpty();
+  return no_max_size &&
+         window->GetProperty(aura::client::kCanMaximizeKey) &&
+         window->GetProperty(aura::client::kCanResizeKey);
+}
+
 }  // namespace
 
 class AthenaContainerLayoutManager : public aura::LayoutManager {
@@ -88,12 +100,12 @@ void AthenaContainerLayoutManager::OnWindowResized() {
     if (is_splitview) {
       if (window == instance->split_view_controller_->left_window())
         window->SetBounds(gfx::Rect(split_size));
-      else if (window == instance->split_view_controller_->right_window())
+      else if (window == instance->split_view_controller_->right_window()) {
         window->SetBounds(
             gfx::Rect(gfx::Point(split_size.width(), 0), split_size));
-      else
-        window->SetBounds(gfx::Rect(work_area));
-    } else {
+      } else if (CanWindowMaximize(window))
+          window->SetBounds(gfx::Rect(work_area));
+    } else if (CanWindowMaximize(window)) {
       window->SetBounds(gfx::Rect(work_area));
     }
   }
@@ -119,6 +131,14 @@ void AthenaContainerLayoutManager::OnWindowRemovedFromLayout(
 void AthenaContainerLayoutManager::OnChildWindowVisibilityChanged(
     aura::Window* child,
     bool visible) {
+  if (visible && CanWindowMaximize(child)) {
+    // Make sure we're resizing a window that actually exists in the window list
+    // to avoid resizing the divider in the split mode.
+    if(instance->window_list_provider_->IsWindowInList(child)) {
+       child->SetBounds(
+          gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area());
+    }
+  }
 }
 
 void AthenaContainerLayoutManager::SetChildBounds(
@@ -291,7 +311,11 @@ void WindowManagerImpl::OnSelectWindow(aura::Window* window) {
   // resized.
   const gfx::Size work_area =
       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area().size();
-  if (window->GetTargetBounds().size() != work_area) {
+
+  // Resize to the screen bounds only if the window is maximize-able, and
+  // is not already maximized
+  if (window->GetTargetBounds().size() != work_area &&
+      CanWindowMaximize(window)) {
     const gfx::Rect& window_bounds = window->bounds();
     const gfx::Rect desired_bounds(work_area);
     gfx::Transform transform;
diff --git a/athena/wm/window_manager_unittest.cc b/athena/wm/window_manager_unittest.cc
index 636686a..b46b70e 100644
--- a/athena/wm/window_manager_unittest.cc
+++ b/athena/wm/window_manager_unittest.cc
@@ -11,6 +11,7 @@
 #include "athena/wm/split_view_controller.h"
 #include "athena/wm/test/window_manager_impl_test_api.h"
 #include "athena/wm/window_manager_impl.h"
+#include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/aura/window.h"
@@ -33,6 +34,7 @@ class WindowManagerTest : public test::AthenaTestBase {
         test::CreateNormalWindow(delegate, nullptr));
     window->Show();
     wm::ActivateWindow(window.get());
+    window->SetProperty(aura::client::kCanMaximizeKey, true);
     return window.Pass();
   }
 
@@ -101,6 +103,59 @@ TEST_F(WindowManagerTest, OverviewToSplitViewMode) {
   EXPECT_FALSE(w1->IsVisible());
 }
 
+TEST_F(WindowManagerTest, OnSelectWindow) {
+  test::WindowManagerImplTestApi wm_api;
+  aura::test::TestWindowDelegate delegate1;
+  aura::test::TestWindowDelegate delegate2;
+  aura::test::TestWindowDelegate delegate3;
+
+  // (w1): A window that sets a maximum size
+  delegate1.set_maximum_size(gfx::Size(300, 200));
+  scoped_ptr<aura::Window> w1(CreateAndActivateWindow(&delegate1));
+  w1->SetBounds(gfx::Rect(0, 0, 300, 200));
+
+  // (w2): A window that doesn't set a max size and is maximizable
+  scoped_ptr<aura::Window> w2(CreateAndActivateWindow(&delegate2));
+  w2->SetBounds(gfx::Rect(0, 0, 300, 200));
+  w2->SetProperty(aura::client::kCanMaximizeKey, true);
+
+  // (w3): A window that doesn't set a max size but is NOT maximizable
+  scoped_ptr<aura::Window> w3(CreateAndActivateWindow(&delegate3));
+  w3->SetBounds(gfx::Rect(0, 0, 300, 200));
+  w3->SetProperty(aura::client::kCanMaximizeKey, false);
+
+  const gfx::Size old_bounds1 = w1->GetTargetBounds().size();
+  const gfx::Size old_bounds2 = w2->GetTargetBounds().size();
+  const gfx::Size old_bounds3 = w3->GetTargetBounds().size();
+  const gfx::Size work_area =
+      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area().size();
+
+  // Select w1, which has a max size, in the overview mode and make sure it's
+  // not maximized.
+  WindowManager::Get()->EnterOverview();
+  WindowOverviewModeDelegate* overview_delegate = wm_api.wm();
+  overview_delegate->OnSelectWindow(w1.get());
+  const gfx::Size new_bounds1 = w1->GetTargetBounds().size();
+  EXPECT_EQ(new_bounds1.ToString(), old_bounds1.ToString());
+  EXPECT_NE(work_area.ToString(), new_bounds1.ToString());
+
+  // Select w2, which has no max size & can be maximized, in the overview
+  // mode and make sure it's actually maximized.
+  WindowManager::Get()->EnterOverview();
+  overview_delegate->OnSelectWindow(w2.get());
+  const gfx::Size new_bounds2 = w2->GetTargetBounds().size();
+  EXPECT_NE(new_bounds2.ToString(), old_bounds2.ToString());
+  EXPECT_EQ(work_area.ToString(), new_bounds2.ToString());
+
+  // Select w3, which has no max size & cannot be maximized, in the overview
+  // mode and make sure it's not maximized.
+  WindowManager::Get()->EnterOverview();
+  overview_delegate->OnSelectWindow(w3.get());
+  const gfx::Size new_bounds3 = w3->GetTargetBounds().size();
+  EXPECT_EQ(new_bounds3.ToString(), old_bounds3.ToString());
+  EXPECT_NE(work_area.ToString(), new_bounds3.ToString());
+}
+
 TEST_F(WindowManagerTest, NewWindowFromOverview) {
   aura::test::TestWindowDelegate delegate;
   scoped_ptr<aura::Window> w1(CreateAndActivateWindow(&delegate));
@@ -352,8 +407,18 @@ TEST_F(WindowManagerTest, SplitModeActivationByShortcut) {
   wm_api.wm()->ToggleSplitView();
   EXPECT_FALSE(wm_api.GetSplitViewController()->IsSplitViewModeActive());
 
-  EXPECT_EQ(width, w1->bounds().width());
+  // w2 is the top window, it should be resized to max width and must be visible
+  // w1 should be hidden.
   EXPECT_EQ(width, w2->bounds().width());
+  EXPECT_TRUE(w2->IsVisible());
+  EXPECT_FALSE(w1->IsVisible());
+
+  // Expect w1 to be visible and maximized when activated.
+  // TODO(oshima): To change to wm::ActivateWindow once the correct window state
+  // is implemented.
+  w1->Show();
+  EXPECT_EQ(width, w1->bounds().width());
+  EXPECT_TRUE(w1->IsVisible());
 }
 
 TEST_F(WindowManagerTest, OverviewModeFromSplitMode) {