src/ash/wm/frame_border_hit_test_controller.cc

   1 // Copyright 2013 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/frame_border_hit_test_controller.h"
   6
   7 #include "ash/ash_constants.h"
   8 #include "ash/wm/header_painter.h"
   9 #include "ash/wm/window_state.h"
  10 #include "ui/aura/env.h"
  11 #include "ui/aura/window.h"
  12 #include "ui/base/hit_test.h"
  13 #include "ui/views/widget/widget.h"
  14 #include "ui/views/widget/widget_delegate.h"
  15 #include "ui/views/window/non_client_view.h"
  16
  17 namespace ash {
  18
  19 FrameBorderHitTestController::FrameBorderHitTestController(views::Widget* frame)
  20     : frame_window_(frame->GetNativeWindow()) {
  21   gfx::Insets mouse_outer_insets(-kResizeOutsideBoundsSize,
  22                                  -kResizeOutsideBoundsSize,
  23                                  -kResizeOutsideBoundsSize,
  24                                  -kResizeOutsideBoundsSize);
  25   gfx::Insets touch_outer_insets = mouse_outer_insets.Scale(
  26       kResizeOutsideBoundsScaleForTouch);
  27   // Ensure we get resize cursors for a few pixels outside our bounds.
  28   frame_window_->SetHitTestBoundsOverrideOuter(mouse_outer_insets,
  29                                                touch_outer_insets);
  30   // Ensure we get resize cursors just inside our bounds as well.
  31   UpdateHitTestBoundsOverrideInner();
  32
  33   frame_window_->AddObserver(this);
  34   ash::wm::GetWindowState(frame_window_)->AddObserver(this);
  35 }
  36
  37 FrameBorderHitTestController::~FrameBorderHitTestController() {
  38   if (frame_window_) {
  39     frame_window_->RemoveObserver(this);
  40     ash::wm::GetWindowState(frame_window_)->RemoveObserver(this);
  41   }
  42 }
  43
  44 // static
  45 int FrameBorderHitTestController::NonClientHitTest(
  46     views::NonClientFrameView* view,
  47     HeaderPainter* header_painter,
  48     const gfx::Point& point) {
  49   gfx::Rect expanded_bounds = view->bounds();
  50   int outside_bounds = kResizeOutsideBoundsSize;
  51
  52   if (aura::Env::GetInstance()->is_touch_down())
  53     outside_bounds *= kResizeOutsideBoundsScaleForTouch;
  54   expanded_bounds.Inset(-outside_bounds, -outside_bounds);
  55
  56   if (!expanded_bounds.Contains(point))
  57     return HTNOWHERE;
  58
  59   // Check the frame first, as we allow a small area overlapping the contents
  60   // to be used for resize handles.
  61   views::Widget* frame = view->GetWidget();
  62   bool can_ever_resize = frame->widget_delegate()->CanResize();
  63   // Don't allow overlapping resize handles when the window is maximized or
  64   // fullscreen, as it can't be resized in those states.
  65   int resize_border =
  66       frame->IsMaximized() || frame->IsFullscreen() ? 0 :
  67       kResizeInsideBoundsSize;
  68   int frame_component = view->GetHTComponentForFrame(point,
  69                                                      resize_border,
  70                                                      resize_border,
  71                                                      kResizeAreaCornerSize,
  72                                                      kResizeAreaCornerSize,
  73                                                      can_ever_resize);
  74   if (frame_component != HTNOWHERE)
  75     return frame_component;
  76
  77   int client_component = frame->client_view()->NonClientHitTest(point);
  78   if (client_component != HTNOWHERE)
  79     return client_component;
  80
  81   return header_painter->NonClientHitTest(point);
  82 }
  83
  84 void FrameBorderHitTestController::UpdateHitTestBoundsOverrideInner() {
  85   // Maximized and fullscreen windows don't want resize handles overlapping the
  86   // content area, because when the user moves the cursor to the right screen
  87   // edge we want them to be able to hit the scroll bar.
  88   if (wm::GetWindowState(frame_window_)->IsMaximizedOrFullscreen()) {
  89     frame_window_->set_hit_test_bounds_override_inner(gfx::Insets());
  90   } else {
  91     frame_window_->set_hit_test_bounds_override_inner(
  92         gfx::Insets(kResizeInsideBoundsSize, kResizeInsideBoundsSize,
  93                     kResizeInsideBoundsSize, kResizeInsideBoundsSize));
  94   }
  95 }
  96
  97 void FrameBorderHitTestController::OnWindowShowTypeChanged(
  98     wm::WindowState* window_state,
  99     wm::WindowShowType old_type) {
 100   UpdateHitTestBoundsOverrideInner();
 101 }
 102
 103 void FrameBorderHitTestController::OnWindowDestroying(aura::Window* window) {
 104   frame_window_->RemoveObserver(this);
 105   ash::wm::GetWindowState(frame_window_)->RemoveObserver(this);
 106   frame_window_ = NULL;
 107 }
 108
 109 }  // namespace ash