editor/libeditor/HTMLEditorEventListener.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef HTMLEditorEventListener_h
   7 #define HTMLEditorEventListener_h
   8
   9 #include "EditorEventListener.h"
  10
  11 #include "EditorForwards.h"
  12 #include "HTMLEditor.h"
  13
  14 #include "nscore.h"
  15
  16 namespace mozilla {
  17
  18 namespace dom {
  19 class Element;
  20 }
  21
  22 class HTMLEditorEventListener final : public EditorEventListener {
  23  public:
  24   HTMLEditorEventListener()
  25       : mListeningToMouseMoveEventForResizers(false),
  26         mListeningToMouseMoveEventForGrabber(false),
  27         mListeningToResizeEvent(false) {}
  28
  29   // nsIDOMEventListener
  30   MOZ_CAN_RUN_SCRIPT NS_IMETHOD HandleEvent(dom::Event* aEvent) override;
  31
  32   /**
  33    * Connect() fails if aEditorBase isn't an HTMLEditor instance.
  34    */
  35   virtual nsresult Connect(EditorBase* aEditorBase) override;
  36
  37   virtual void Disconnect() override;
  38
  39   /**
  40    * ListenToMouseMoveEventForResizers() starts to listen to or stop
  41    * listening to "mousemove" events for resizers.
  42    */
  43   nsresult ListenToMouseMoveEventForResizers(bool aListen) {
  44     if (aListen == mListeningToMouseMoveEventForResizers) {
  45       return NS_OK;
  46     }
  47     nsresult rv = ListenToMouseMoveEventForResizersOrGrabber(aListen, false);
  48     NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
  49                          "HTMLEditorEventListener::"
  50                          "ListenToMouseMoveEventForResizersOrGrabber() failed");
  51     return rv;
  52   }
  53
  54   /**
  55    * ListenToMouseMoveEventForResizers() starts to listen to or stop
  56    * listening to "mousemove" events for grabber to move absolutely
  57    * positioned element.
  58    */
  59   nsresult ListenToMouseMoveEventForGrabber(bool aListen) {
  60     if (aListen == mListeningToMouseMoveEventForGrabber) {
  61       return NS_OK;
  62     }
  63     nsresult rv = ListenToMouseMoveEventForResizersOrGrabber(aListen, true);
  64     NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
  65                          "HTMLEditorEventListener::"
  66                          "ListenToMouseMoveEventForResizersOrGrabber() failed");
  67     return rv;
  68   }
  69
  70   /**
  71    * ListenToWindowResizeEvent() starts to listen to or stop listening to
  72    * "resize" events of the document.
  73    */
  74   nsresult ListenToWindowResizeEvent(bool aListen);
  75
  76  protected:
  77   MOZ_CAN_RUN_SCRIPT virtual nsresult MouseDown(
  78       dom::MouseEvent* aMouseEvent) override;
  79   MOZ_CAN_RUN_SCRIPT virtual nsresult MouseUp(
  80       dom::MouseEvent* aMouseEvent) override;
  81   MOZ_CAN_RUN_SCRIPT virtual nsresult MouseClick(
  82       WidgetMouseEvent* aMouseClickEvent) override;
  83
  84   nsresult ListenToMouseMoveEventForResizersOrGrabber(bool aListen,
  85                                                       bool aForGrabber);
  86
  87   MOZ_CAN_RUN_SCRIPT nsresult HandlePrimaryMouseButtonDown(
  88       HTMLEditor& aHTMLEditor, dom::MouseEvent& aMouseEvent);
  89   MOZ_CAN_RUN_SCRIPT nsresult HandleSecondaryMouseButtonDown(
  90       HTMLEditor& aHTMLEditor, dom::MouseEvent& aMouseEvent);
  91
  92   bool mListeningToMouseMoveEventForResizers;
  93   bool mListeningToMouseMoveEventForGrabber;
  94   bool mListeningToResizeEvent;
  95 };
  96
  97 }  // namespace mozilla
  98
  99 #endif  // #ifndef HTMLEditorEventListener_h