ash/wm/resize_handle_window_targeter.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/wm/resize_handle_window_targeter.h"
   6
   7 #include "ash/ash_constants.h"
   8 #include "ash/wm/immersive_fullscreen_controller.h"
   9 #include "ash/wm/window_state.h"
  10 #include "ui/aura/window.h"
  11
  12 namespace ash {
  13
  14 ResizeHandleWindowTargeter::ResizeHandleWindowTargeter(
  15     aura::Window* window,
  16     ImmersiveFullscreenController* controller)
  17     : window_(window),
  18       immersive_controller_(controller) {
  19   wm::WindowState* window_state = wm::GetWindowState(window_);
  20   OnPostWindowStateTypeChange(window_state, wm::WINDOW_STATE_TYPE_DEFAULT);
  21   window_state->AddObserver(this);
  22   window_->AddObserver(this);
  23 }
  24
  25 ResizeHandleWindowTargeter::~ResizeHandleWindowTargeter() {
  26   if (window_) {
  27     window_->RemoveObserver(this);
  28     wm::GetWindowState(window_)->RemoveObserver(this);
  29   }
  30 }
  31
  32 void ResizeHandleWindowTargeter::OnPostWindowStateTypeChange(
  33     wm::WindowState* window_state,
  34     wm::WindowStateType old_type) {
  35   if (window_state->IsMaximizedOrFullscreen()) {
  36     frame_border_inset_ = gfx::Insets();
  37   } else {
  38     frame_border_inset_ = gfx::Insets(kResizeInsideBoundsSize,
  39                                       kResizeInsideBoundsSize,
  40                                       kResizeInsideBoundsSize,
  41                                       kResizeInsideBoundsSize);
  42   }
  43 }
  44
  45 void ResizeHandleWindowTargeter::OnWindowDestroying(aura::Window* window) {
  46   CHECK_EQ(window_, window);
  47   wm::GetWindowState(window_)->RemoveObserver(this);
  48   window_ = NULL;
  49 }
  50
  51 ui::EventTarget* ResizeHandleWindowTargeter::FindTargetForLocatedEvent(
  52     ui::EventTarget* root,
  53     ui::LocatedEvent* event) {
  54   aura::Window* window = static_cast<aura::Window*>(root);
  55   if (window == window_) {
  56     gfx::Insets insets;
  57     if (immersive_controller_ && immersive_controller_->IsEnabled() &&
  58         !immersive_controller_->IsRevealed() &&
  59         event->IsTouchEvent()) {
  60       // If the window is in immersive fullscreen, and top-of-window views are
  61       // not revealed, then touch events towards the top of the window
  62       // should not reach the child window so that touch gestures can be used to
  63       // reveal the top-of-windows views. This is needed because the child
  64       // window may consume touch events and prevent touch-scroll gesture from
  65       // being generated.
  66       insets = gfx::Insets(kImmersiveFullscreenTopEdgeInset, 0, 0, 0);
  67     } else {
  68       // If the event falls very close to the inside of the frame border, then
  69       // target the window itself, so that the window can be resized easily.
  70       insets = frame_border_inset_;
  71     }
  72
  73     if (!insets.empty()) {
  74       gfx::Rect bounds = gfx::Rect(window_->bounds().size());
  75       bounds.Inset(insets);
  76       if (!bounds.Contains(event->location()))
  77         return window_;
  78     }
  79   }
  80   return aura::WindowTargeter::FindTargetForLocatedEvent(root, event);
  81 }
  82
  83 bool ResizeHandleWindowTargeter::SubtreeShouldBeExploredForEvent(
  84     ui::EventTarget* target,
  85     const ui::LocatedEvent& event) {
  86   if (target == window_) {
  87     // Defer to the parent's targeter on whether |window_| should be able to
  88     // receive the event.
  89     ui::EventTarget* parent = target->GetParentTarget();
  90     if (parent) {
  91       ui::EventTargeter* targeter = parent->GetEventTargeter();
  92       if (targeter)
  93         return targeter->SubtreeShouldBeExploredForEvent(target, event);
  94     }
  95   }
  96   return aura::WindowTargeter::SubtreeShouldBeExploredForEvent(target, event);
  97 }
  98
  99 }  // namespace ash