Add wxEVT_MAGNIFY mouse event.

Currently this is implemented for wxOSX only.

Closes #14322.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78274 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -62,6 +62,7 @@ All (GUI):
 
 - Allow requesting modern (3.x+) OpenGL version in wxGLCanvas (Fabio Arnold).
 - Allow customizing window shown by wxBusyInfo.
+- Add wxEVT_MAGNIFY mouse event (Joost Nieuwenhuijse).
 - Make results of wxDC::DrawEllipticArc() consistent across all platforms.
 - XRC handler for wxAuiToolBar added (Kinaou Hervé, David Hart).
 - Add wxCursor::GetHotSpot().

include/wx/event.h

@@ -681,6 +681,7 @@ wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_AUX1_DCLICK, wxMouseEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_AUX2_DOWN, wxMouseEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_AUX2_UP, wxMouseEvent);
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_AUX2_DCLICK, wxMouseEvent);
+wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_MAGNIFY, wxMouseEvent);
 
     // Character input event type
 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_CORE, wxEVT_CHAR, wxKeyEvent);
@@ -1733,6 +1734,8 @@ public:
     bool Aux1DClick() const { return (m_eventType == wxEVT_AUX1_DCLICK); }
     bool Aux2DClick() const { return (m_eventType == wxEVT_AUX2_DCLICK); }
 
+    bool Magnify() const { return (m_eventType == wxEVT_MAGNIFY); }
+
     // True if a button is down and the mouse is moving
     bool Dragging() const
     {
@@ -1787,6 +1790,7 @@ public:
     // Is the system set to do page scrolling?
     bool IsPageScroll() const { return ((unsigned int)m_linesPerAction == UINT_MAX); }
 
+    float GetMagnification() const { return m_magnification; }
     virtual wxEvent *Clone() const wxOVERRIDE { return new wxMouseEvent(*this); }
     virtual wxEventCategory GetEventCategory() const wxOVERRIDE { return wxEVT_CATEGORY_USER_INPUT; }
 
@@ -1805,6 +1809,7 @@ public:
     int           m_wheelDelta;
     int           m_linesPerAction;
     int           m_columnsPerAction;
+    float         m_magnification;
 
 protected:
     void Assign(const wxMouseEvent& evt);
@@ -4198,6 +4203,7 @@ typedef void (wxEvtHandler::*wxClipboardTextEventFunction)(wxClipboardTextEvent&
 #define EVT_MOUSE_AUX2_DOWN(func) wx__DECLARE_EVT0(wxEVT_AUX2_DOWN, wxMouseEventHandler(func))
 #define EVT_MOUSE_AUX2_UP(func) wx__DECLARE_EVT0(wxEVT_AUX2_UP, wxMouseEventHandler(func))
 #define EVT_MOUSE_AUX2_DCLICK(func) wx__DECLARE_EVT0(wxEVT_AUX2_DCLICK, wxMouseEventHandler(func))
+#define EVT_MAGNIFY(func) wx__DECLARE_EVT0(wxEVT_MAGNIFY, wxMouseEventHandler(func))
 
 // All mouse events
 #define EVT_MOUSE_EVENTS(func) \
@@ -4219,7 +4225,8 @@ typedef void (wxEvtHandler::*wxClipboardTextEventFunction)(wxClipboardTextEvent&
     EVT_MOTION(func) \
     EVT_LEAVE_WINDOW(func) \
     EVT_ENTER_WINDOW(func) \
-    EVT_MOUSEWHEEL(func)
+    EVT_MOUSEWHEEL(func) \
+    EVT_MAGNIFY(func)
 
 // Scrolling from wxWindow (sent to wxScrolledWindow)
 #define EVT_SCROLLWIN_TOP(func) wx__DECLARE_EVT0(wxEVT_SCROLLWIN_TOP, wxScrollWinEventHandler(func))

interface/wx/event.h

@@ -2634,6 +2634,8 @@ enum wxMouseWheelAxis
         Process a @c wxEVT_MOUSEWHEEL event.
     @event{EVT_MOUSE_EVENTS(func)}
         Process all mouse events.
+    @event{EVT_MAGNIFY(func)}
+        Process a @c wxEVT_MAGNIFY event (new since wxWidgets 3.1.0).
     @endEventTable
 
     @library{wxcore}
@@ -2667,6 +2669,7 @@ public:
          @li @c wxEVT_AUX2_DCLICK
          @li @c wxEVT_MOTION
          @li @c wxEVT_MOUSEWHEEL
+         @li @c wxEVT_MAGNIFY
     */
     wxMouseEvent(wxEventType mouseEventType = wxEVT_NULL);
 
@@ -2792,6 +2795,21 @@ public:
     */
     wxPoint GetLogicalPosition(const wxDC& dc) const;
 
+    /**
+        For magnify (pinch to zoom) events: returns the change in magnification.
+
+        A value of 0 means no change, a positive value means we should enlarge
+        (or zoom in), a negative value means we should shrink (or zoom out).
+
+        This method is only valid to call for @c wxEVT_MAGNIFY events which are
+        currently only generated under OS X.
+
+        @see Magnify()
+
+        @since 3.1.0
+    */
+    float GetMagnification() const;
+
     /**
         Get wheel delta, normally 120.
 
@@ -2858,6 +2876,17 @@ public:
     */
     bool LeftUp() const;
 
+    /**
+        Returns @true if the event is a magnify (i.e.\ pinch to zoom) event.
+
+        Such events are currently generated only under OS X.
+
+        @see GetMagnification()
+
+        @since 3.1.0
+    */
+    bool Magnify() const;
+
     /**
         Returns @true if the Meta key was down at the time of the event.
     */

src/common/event.cpp

@@ -208,6 +208,7 @@ wxDEFINE_EVENT( wxEVT_AUX1_DCLICK, wxMouseEvent );
 wxDEFINE_EVENT( wxEVT_AUX2_DOWN, wxMouseEvent );
 wxDEFINE_EVENT( wxEVT_AUX2_UP, wxMouseEvent );
 wxDEFINE_EVENT( wxEVT_AUX2_DCLICK, wxMouseEvent );
+wxDEFINE_EVENT( wxEVT_MAGNIFY, wxMouseEvent );
 
 // Character input event type
 wxDEFINE_EVENT( wxEVT_CHAR, wxKeyEvent );
@@ -565,6 +566,7 @@ wxMouseEvent::wxMouseEvent(wxEventType commandType)
     m_wheelDelta = 0;
     m_linesPerAction = 0;
     m_columnsPerAction = 0;
+    m_magnification = 0.0f;
 }
 
 void wxMouseEvent::Assign(const wxMouseEvent& event)
@@ -589,6 +591,8 @@ void wxMouseEvent::Assign(const wxMouseEvent& event)
     m_linesPerAction = event.m_linesPerAction;
     m_columnsPerAction = event.m_columnsPerAction;
     m_wheelAxis = event.m_wheelAxis;
+    
+    m_magnification = event.m_magnification;
 }
 
 // return true if was a button dclick event

src/osx/cocoa/window.mm

@@ -749,6 +749,12 @@ void wxWidgetCocoaImpl::SetupMouseEvent( wxMouseEvent &wxevent , NSEvent * nsEve
         case NSMouseMoved :
             wxevent.SetEventType( wxEVT_MOTION ) ;
             break;
+        
+        case NSEventTypeMagnify:
+            wxevent.SetEventType( wxEVT_MAGNIFY );
+            wxevent.m_magnification = [nsEvent magnification];
+            break;
+            
         default :
             break ;
     }
@@ -1740,6 +1746,10 @@ void wxOSXCocoaClassAddWXMethods(Class c)
     wxOSX_CLASS_ADD_METHOD(c, @selector(mouseEntered:), (IMP) wxOSX_mouseEvent, "v@:@" )
     wxOSX_CLASS_ADD_METHOD(c, @selector(mouseExited:), (IMP) wxOSX_mouseEvent, "v@:@" )
         
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
+    wxOSX_CLASS_ADD_METHOD(c, @selector(magnifyWithEvent:), (IMP)wxOSX_mouseEvent, "v@:@")
+#endif
+
     wxOSX_CLASS_ADD_METHOD(c, @selector(cursorUpdate:), (IMP) wxOSX_cursorUpdate, "v@:@" )
 
     wxOSX_CLASS_ADD_METHOD(c, @selector(keyDown:), (IMP) wxOSX_keyEvent, "v@:@" )