src/chrome/browser/ui/views/link_disambiguation/link_disambiguation_popup.cc

   1 // Copyright (c) 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 "chrome/browser/ui/views/link_disambiguation/link_disambiguation_popup.h"
   6
   7 #include "ui/aura/client/screen_position_client.h"
   8 #include "ui/events/event.h"
   9 #include "ui/events/event_processor.h"
  10 #include "ui/events/event_utils.h"
  11 #include "ui/events/gesture_event_details.h"
  12 #include "ui/gfx/display.h"
  13 #include "ui/gfx/image/image.h"
  14 #include "ui/gfx/image/image_skia.h"
  15 #include "ui/gfx/screen.h"
  16 #include "ui/views/bubble/bubble_delegate.h"
  17 #include "ui/views/controls/image_view.h"
  18
  19 class LinkDisambiguationPopup::ZoomBubbleView
  20     : public views::BubbleDelegateView {
  21  public:
  22   ZoomBubbleView(const gfx::Rect& target_rect,
  23                  const gfx::ImageSkia* zoomed_skia_image,
  24                  const aura::Window* content,
  25                  LinkDisambiguationPopup* popup,
  26                  const base::Callback<void(ui::GestureEvent*)>& gesture_cb,
  27                  const base::Callback<void(ui::MouseEvent*)>& mouse_cb);
  28
  29   void Close();
  30
  31  private:
  32   // views::View overrides
  33   virtual gfx::Size GetPreferredSize() const OVERRIDE;
  34   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
  35   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
  36
  37   // WidgetObserver overrides
  38   virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
  39
  40   const float scale_;
  41   const aura::Window* content_;
  42   const base::Callback<void(ui::GestureEvent*)> gesture_cb_;
  43   const base::Callback<void(ui::MouseEvent*)> mouse_cb_;
  44   LinkDisambiguationPopup* popup_;
  45   const gfx::Rect target_rect_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(ZoomBubbleView);
  48 };
  49
  50 LinkDisambiguationPopup::ZoomBubbleView::ZoomBubbleView(
  51     const gfx::Rect& target_rect,
  52     const gfx::ImageSkia* zoomed_skia_image,
  53     const aura::Window* content,
  54     LinkDisambiguationPopup* popup,
  55     const base::Callback<void(ui::GestureEvent*)>& gesture_cb,
  56     const base::Callback<void(ui::MouseEvent*)>& mouse_cb)
  57     : BubbleDelegateView(NULL, views::BubbleBorder::FLOAT),
  58       scale_(static_cast<float>(zoomed_skia_image->width()) /
  59           static_cast<float>(target_rect.width())),
  60       content_(content),
  61       gesture_cb_(gesture_cb),
  62       mouse_cb_(mouse_cb),
  63       popup_(popup),
  64       target_rect_(target_rect) {
  65   views::ImageView* image_view = new views::ImageView();
  66   image_view->SetBounds(
  67       0, 0, zoomed_skia_image->width(), zoomed_skia_image->height());
  68   image_view->SetImage(zoomed_skia_image);
  69
  70   AddChildView(image_view);
  71
  72   views::BubbleDelegateView::CreateBubble(this);
  73 }
  74
  75 void LinkDisambiguationPopup::ZoomBubbleView::Close() {
  76   if (GetWidget())
  77     GetWidget()->Close();
  78 }
  79
  80 gfx::Size LinkDisambiguationPopup::ZoomBubbleView::GetPreferredSize() const {
  81   return target_rect_.size();
  82 }
  83
  84 void LinkDisambiguationPopup::ZoomBubbleView::OnMouseEvent(
  85     ui::MouseEvent* event) {
  86   // Transform mouse event back to coordinate system of the web content window
  87   // before providing to the callback.
  88   gfx::PointF xform_location(
  89       (event->location().x() / scale_) + target_rect_.x(),
  90       (event->location().y() / scale_) + target_rect_.y());
  91   ui::MouseEvent xform_event(event->type(), xform_location, xform_location,
  92       event->flags(), event->changed_button_flags());
  93   mouse_cb_.Run(&xform_event);
  94   event->SetHandled();
  95
  96   // If user completed a click we can close the window.
  97   if (event->type() == ui::EventType::ET_MOUSE_RELEASED)
  98     Close();
  99 }
 100
 101 void LinkDisambiguationPopup::ZoomBubbleView::OnGestureEvent(
 102     ui::GestureEvent* event) {
 103   // If we receive gesture events that are outside of our bounds we close
 104   // ourselves, as perhaps the user has decided on a different part of the page.
 105   if (event->location().x() > bounds().width() ||
 106       event->location().y() > bounds().height()) {
 107     Close();
 108     return;
 109   }
 110
 111   // Scale the gesture event back to the size of the original |target_rect_|,
 112   // and then offset it to be relative to that |target_rect_| before sending
 113   // it back to the callback.
 114   gfx::PointF xform_location(
 115       (event->location().x() / scale_) + target_rect_.x(),
 116       (event->location().y() / scale_) + target_rect_.y());
 117   ui::GestureEventDetails xform_details(event->details());
 118   xform_details.set_bounding_box(gfx::RectF(
 119       (event->details().bounding_box().x() / scale_) + target_rect_.x(),
 120       (event->details().bounding_box().y() / scale_) + target_rect_.y(),
 121       event->details().bounding_box().width() / scale_,
 122       event->details().bounding_box().height() / scale_));
 123   ui::GestureEvent xform_event(xform_location.x(),
 124                                xform_location.y(),
 125                                event->flags(),
 126                                event->time_stamp(),
 127                                xform_details);
 128   gesture_cb_.Run(&xform_event);
 129   event->SetHandled();
 130
 131   // If we completed a tap we close ourselves, as the web content will navigate
 132   // if the user hit a link.
 133   if (event->type() == ui::EventType::ET_GESTURE_TAP)
 134     Close();
 135 }
 136
 137 void LinkDisambiguationPopup::ZoomBubbleView::OnWidgetClosing(
 138     views::Widget* widget) {
 139   popup_->InvalidateBubbleView();
 140 }
 141
 142 LinkDisambiguationPopup::LinkDisambiguationPopup()
 143     : content_(NULL),
 144       view_(NULL) {
 145 }
 146
 147 LinkDisambiguationPopup::~LinkDisambiguationPopup() {
 148   Close();
 149 }
 150
 151 void LinkDisambiguationPopup::Show(
 152     const SkBitmap& zoomed_bitmap,
 153     const gfx::Rect& target_rect,
 154     const gfx::NativeView content,
 155     const base::Callback<void(ui::GestureEvent*)>& gesture_cb,
 156     const base::Callback<void(ui::MouseEvent*)>& mouse_cb) {
 157   content_ = content;
 158
 159   view_ = new ZoomBubbleView(
 160       target_rect,
 161       gfx::Image::CreateFrom1xBitmap(zoomed_bitmap).ToImageSkia(),
 162       content_,
 163       this,
 164       gesture_cb,
 165       mouse_cb);
 166
 167   // Center the zoomed bubble over the target rectangle, constrained to the
 168   // work area in the current display. Since |target_rect| is provided in
 169   // |content_| coordinate system, we must convert it into Screen coordinates
 170   // for correct window positioning.
 171   aura::client::ScreenPositionClient* screen_position_client =
 172       aura::client::GetScreenPositionClient(content_->GetRootWindow());
 173   gfx::Point target_screen(target_rect.x() + (target_rect.width() / 2),
 174       target_rect.y() + (target_rect.height() / 2));
 175   if (screen_position_client)
 176     screen_position_client->ConvertPointToScreen(content_, &target_screen);
 177   gfx::Rect window_bounds(
 178       target_screen.x() - (zoomed_bitmap.width() / 2),
 179       target_screen.y() - (zoomed_bitmap.height() / 2),
 180       zoomed_bitmap.width(),
 181       zoomed_bitmap.height());
 182   const gfx::Display display =
 183       gfx::Screen::GetScreenFor(content)->GetDisplayNearestWindow(content);
 184   window_bounds.AdjustToFit(display.work_area());
 185   view_->GetWidget()->SetBounds(window_bounds);
 186   view_->GetWidget()->Show();
 187 }
 188
 189 void LinkDisambiguationPopup::Close() {
 190   if (view_) {
 191     view_->Close();
 192     view_ = NULL;
 193   }
 194 }
 195
 196 void LinkDisambiguationPopup::InvalidateBubbleView() {
 197   view_ = NULL;
 198 }