content/browser/renderer_host/input/gesture_text_selector.h

   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 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_TEXT_SELECTOR_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_TEXT_SELECTOR_H_
   7
   8 #include "base/gtest_prod_util.h"
   9 #include "base/macros.h"
  10 #include "base/time/time.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace ui {
  14 struct GestureEventData;
  15 class MotionEvent;
  16 }
  17
  18 namespace content {
  19 class GestureTextSelectorTest;
  20
  21 // Interface with which GestureTextSelector can select, unselect, show
  22 // selection handles, or long press.
  23 class CONTENT_EXPORT GestureTextSelectorClient {
  24  public:
  25   virtual ~GestureTextSelectorClient() {}
  26
  27   virtual void ShowSelectionHandlesAutomatically() = 0;
  28   virtual void SelectRange(float x1, float y1, float x2, float y2) = 0;
  29   virtual void Unselect() = 0;
  30   virtual void LongPress(base::TimeTicks time, float x, float y) = 0;
  31 };
  32
  33 // A class to handle gesture-based text selection, such as when clicking first
  34 // button on stylus input. It also generates a synthetic long press gesture on
  35 // tap so that a word can be selected or the contextual menu can be shown.
  36 class CONTENT_EXPORT GestureTextSelector {
  37  public:
  38   explicit GestureTextSelector(GestureTextSelectorClient* client);
  39   virtual ~GestureTextSelector();
  40
  41   // This should be called after gesture detection but before associated
  42   // gestures are dispatched. Returns whether it will consume |event|.
  43   bool OnTouchEvent(const ui::MotionEvent& event);
  44
  45   // Returns whether it will consume the event.
  46   bool OnGestureEvent(const ui::GestureEventData& gesture);
  47
  48  private:
  49   friend class GestureTextSelectorTest;
  50   FRIEND_TEST_ALL_PREFIXES(GestureTextSelectorTest,
  51                            ShouldStartTextSelection);
  52
  53   static bool ShouldStartTextSelection(const ui::MotionEvent& event);
  54
  55   GestureTextSelectorClient* client_;
  56   bool text_selection_triggered_;
  57   float anchor_x_;
  58   float anchor_y_;
  59
  60   DISALLOW_COPY_AND_ASSIGN(GestureTextSelector);
  61 };
  62
  63 }  // namespace content
  64
  65 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_TEXT_SELECTOR_H_