widget/nsIRollupListener.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef __nsIRollupListener_h__
   8 #define __nsIRollupListener_h__
   9
  10 #include "nsTArray.h"
  11 #include "nsPoint.h"
  12
  13 class nsIContent;
  14 class nsIWidget;
  15
  16 class nsIRollupListener {
  17  public:
  18
  19   /**
  20    * Notifies the object to rollup, optionally returning the node that
  21    * was just rolled up.
  22    *
  23    * If aFlush is true, then views should be flushed after the rollup.
  24    *
  25    * aPoint is the mouse pointer position where the event that triggered the
  26    * rollup occurred, which may be nullptr.
  27    *
  28    * aCount is the number of popups in a chain to close. If this is
  29    * UINT32_MAX, then all popups are closed.
  30    * If aLastRolledUp is non-null, it will be set to the last rolled up popup,
  31    * if this is supported. aLastRolledUp is not addrefed.
  32    *
  33    * Returns true if the event that the caller is processing should be consumed.
  34    */
  35   virtual bool Rollup(uint32_t aCount, bool aFlush,
  36                       const nsIntPoint* aPoint, nsIContent** aLastRolledUp) = 0;
  37
  38   /**
  39    * Asks the RollupListener if it should rollup on mouse wheel events
  40    */
  41   virtual bool ShouldRollupOnMouseWheelEvent() = 0;
  42
  43   /**
  44    * Asks the RollupListener if it should consume mouse wheel events
  45    */
  46   virtual bool ShouldConsumeOnMouseWheelEvent() = 0;
  47
  48   /**
  49    * Asks the RollupListener if it should rollup on mouse activate, eg. X-Mouse
  50    */
  51   virtual bool ShouldRollupOnMouseActivate() = 0;
  52
  53   /*
  54    * Retrieve the widgets for open menus and store them in the array
  55    * aWidgetChain. The number of menus of the same type should be returned,
  56    * for example, if a context menu is open, return only the number of menus
  57    * that are part of the context menu chain. This allows closing up only
  58    * those menus in different situations. The returned value should be exactly
  59    * the same number of widgets added to aWidgetChain.
  60    */
  61   virtual uint32_t GetSubmenuWidgetChain(nsTArray<nsIWidget*> *aWidgetChain) = 0;
  62
  63   /**
  64    * Notify the RollupListener that the widget did a Move or Resize.
  65    */
  66   virtual void NotifyGeometryChange() = 0;
  67
  68   virtual nsIWidget* GetRollupWidget() = 0;
  69 };
  70
  71 #endif /* __nsIRollupListener_h__ */