Enable touch text selection on Athena

athena/wm/window_overview_mode.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 "athena/wm/window_overview_mode.h"
 
 #include <algorithm>
 #include <functional>
 #include <vector>
 
@@ skipping 27 matching lines @@
 }  // namespace
 
 DECLARE_WINDOW_PROPERTY_TYPE(WindowOverviewState*)
 DEFINE_OWNED_WINDOW_PROPERTY_KEY(WindowOverviewState,
                                  kWindowOverviewState,
                                  NULL)
 namespace athena {
 
 namespace {
 
+bool ShouldShowWindowInOverviewMode(aura::Window* window) {
+  return window->type() == ui::wm::WINDOW_TYPE_NORMAL;
+}
+
 // Sets the progress-state for the window in the overview mode.
 void SetWindowProgress(aura::Window* window, float progress) {
   WindowOverviewState* state = window->GetProperty(kWindowOverviewState);
   gfx::Transform transform =
       gfx::Tween::TransformValueBetween(progress, state->top, state->bottom);
   window->SetTransform(transform);
   state->progress = progress;
 }
 
 // Resets the overview-related state for |window|.
@@ skipping 45 matching lines @@
 
     // Prepare the desired transforms for all the windows, and set the initial
     // state on the windows.
     ComputeTerminalStatesForAllWindows();
     SetInitialWindowStates();
   }
 
   virtual ~WindowOverviewModeImpl() {
     container_->set_target_handler(container_->delegate());
 
-    aura::Window::Windows windows = container_->children();
-    if (windows.empty())
-      return;
-    std::for_each(windows.begin(), windows.end(), &RestoreWindowState);
+    const aura::Window::Windows& windows = container_->children();
+    for (aura::Window::Windows::const_iterator iter = windows.begin();
+         iter != windows.end();
+         ++iter) {
+      if ((*iter)->GetProperty(kWindowOverviewState))
+        RestoreWindowState(*iter);
+    }
   }
 
  private:
   // Computes the transforms for all windows in both the topmost and bottom-most
   // positions. The transforms are set in the |kWindowOverviewState| property of
   // the windows.
   void ComputeTerminalStatesForAllWindows() {
-    aura::Window::Windows windows = container_->children();
-    size_t window_count = windows.size();
+    const aura::Window::Windows& windows = container_->children();
+    size_t window_count = std::count_if(windows.begin(), windows.end(),
+                                        ShouldShowWindowInOverviewMode);
+
     size_t index = 0;
     const gfx::Size container_size = container_->bounds().size();
 
     const int kGapBetweenWindowsBottom = 10;
     const int kGapBetweenWindowsTop = 5;
     const float kMinScale = 0.6f;
     const float kMaxScale = 0.95f;
 
-    for (aura::Window::Windows::reverse_iterator iter = windows.rbegin();
+    for (aura::Window::Windows::const_reverse_iterator iter = windows.rbegin();
          iter != windows.rend();
-         ++iter, ++index) {
+         ++iter) {
       aura::Window* window = (*iter);
+      if (!ShouldShowWindowInOverviewMode(window))
+        continue;
 
       gfx::Transform top_transform;
       int top = (window_count - index - 1) * kGapBetweenWindowsTop;
       float x_translate = container_size.width() * (1 - kMinScale) / 2.;
       top_transform.Translate(x_translate, top);
       top_transform.Scale(kMinScale, kMinScale);
 
       gfx::Transform bottom_transform;
       int bottom = GetScrollableHeight() - (index * kGapBetweenWindowsBottom);
       x_translate = container_size.width() * (1 - kMaxScale) / 2.;
       bottom_transform.Translate(x_translate, bottom - window->bounds().y());
       bottom_transform.Scale(kMaxScale, kMaxScale);
 
       WindowOverviewState* state = new WindowOverviewState;
       state->top = top_transform;
       state->bottom = bottom_transform;
       state->progress = 0.f;
       state->shadow = CreateShadowForWindow(window);
       window->SetProperty(kWindowOverviewState, state);
+
+      index++;
     }
   }
 
   // Sets the initial position for the windows for the overview mode.
   void SetInitialWindowStates() {
-    aura::Window::Windows windows = container_->children();
-    size_t window_count = windows.size();
     // The initial overview state of the topmost three windows.
     const float kInitialProgress[] = { 0.5f, 0.05f, 0.01f };
-    for (size_t i = 0; i < window_count; ++i) {
+    size_t index = 0;
+    const aura::Window::Windows& windows = container_->children();
+    for (aura::Window::Windows::const_reverse_iterator iter = windows.rbegin();
+         iter != windows.rend();
+         ++iter) {
+      aura::Window* window = (*iter);
+      if (!window->GetProperty(kWindowOverviewState))
+        continue;
+
       float progress = 0.f;
-      aura::Window* window = windows[window_count - 1 - i];
-      if (i < arraysize(kInitialProgress))
-        progress = kInitialProgress[i];
+      if (index < arraysize(kInitialProgress))
+        progress = kInitialProgress[index];
 
       scoped_refptr<ui::LayerAnimator> animator =
           window->layer()->GetAnimator();
 
       // Unset any in-progress animation.
       {
         ui::ScopedLayerAnimationSettings settings(animator);
         settings.SetPreemptionStrategy(
             ui::LayerAnimator::IMMEDIATELY_SET_NEW_TARGET);
         window->Show();
         window->SetTransform(gfx::Transform());
       }
       // Setup the animation.
       {
         ui::ScopedLayerAnimationSettings settings(animator);
         settings.SetPreemptionStrategy(
             ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
         settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(250));
         SetWindowProgress(window, progress);
       }
+      index++;
     }
   }
 
   scoped_ptr<wm::Shadow> CreateShadowForWindow(aura::Window* window) {
     scoped_ptr<wm::Shadow> shadow(new wm::Shadow());
     shadow->Init(wm::Shadow::STYLE_ACTIVE);
     shadow->SetContentBounds(gfx::Rect(window->bounds().size()));
     shadow->layer()->SetVisible(true);
     window->layer()->Add(shadow->layer());
     return shadow.Pass();
@@ skipping 14 matching lines @@
         targeter->FindTargetForLocatedEvent(container_, event));
     while (target && target->parent() != container_)
       target = target->parent();
     return target;
   }
 
   // Scroll the window list by |delta_y| amount. |delta_y| is negative when
   // scrolling up; and positive when scrolling down.
   void DoScroll(float delta_y) {
     const float kEpsilon = 1e-3f;
-    aura::Window::Windows windows = container_->children();
     float delta_y_p = std::abs(delta_y) / GetScrollableHeight();
+    const aura::Window::Windows& windows = container_->children();
     if (delta_y < 0) {
       // Scroll up. Start with the top-most (i.e. behind-most in terms of
       // z-index) window, and try to scroll them up.
-      for (aura::Window::Windows::iterator iter = windows.begin();
+      for (aura::Window::Windows::const_iterator iter = windows.begin();
            delta_y_p > kEpsilon && iter != windows.end();
            ++iter) {
         aura::Window* window = (*iter);
         WindowOverviewState* state = window->GetProperty(kWindowOverviewState);
+        if (!state)
+          continue;
         if (state->progress > kEpsilon) {
           // It is possible to scroll |window| up. Scroll it up, and update
           // |delta_y_p| for the next window.
           float apply = delta_y_p * state->progress;
           SetWindowProgress(window, std::max(0.f, state->progress - apply * 3));
           delta_y_p -= apply;
         }
       }
     } else {
       // Scroll down. Start with the bottom-most (i.e. front-most in terms of
       // z-index) window, and try to scroll them down.
-      for (aura::Window::Windows::reverse_iterator iter = windows.rbegin();
+      for (aura::Window::Windows::const_reverse_iterator iter =
+               windows.rbegin();
            delta_y_p > kEpsilon && iter != windows.rend();
            ++iter) {
         aura::Window* window = (*iter);
         WindowOverviewState* state = window->GetProperty(kWindowOverviewState);
+        if (!state)
+          continue;
         if (1.f - state->progress > kEpsilon) {
           // It is possible to scroll |window| down. Scroll it down, and update
           // |delta_y_p| for the next window.
           SetWindowProgress(window, std::min(1.f, state->progress + delta_y_p));
           delta_y_p /= 2.f;
         }
       }
     }
   }
 
@@ skipping 43 matching lines @@
 
 // static
 scoped_ptr<WindowOverviewMode> WindowOverviewMode::Create(
     aura::Window* container,
     WindowOverviewModeDelegate* delegate) {
   return scoped_ptr<WindowOverviewMode>(
       new WindowOverviewModeImpl(container, delegate));
 }
 
 }  // namespace athena