C# DrawingArea.AddEvents方法代码示例

 public WidgetWrapper(DrawingArea widget)
 {
     this.widget = widget;
     MoveWaitMS = 200;
     widget.AddEvents ((int)EventMask.PointerMotionMask);
     widget.AddEvents ((int)EventMask.ButtonPressMask);
     widget.AddEvents ((int)EventMask.ButtonReleaseMask);
     widget.AddEvents ((int)EventMask.KeyPressMask);
     widget.ExposeEvent += HandleExposeEvent;
     widget.ButtonPressEvent += HandleButtonPressEvent;
     widget.ButtonReleaseEvent += HandleButtonReleaseEvent;
     widget.MotionNotifyEvent += HandleMotionNotifyEvent;
 }

        public SharpApp()
            : base("Simple drawing")
        {
            SetDefaultSize(400, 400);
            SetPosition(WindowPosition.Center);
            DeleteEvent += delegate { Application.Quit(); };

            DrawingArea darea = new DrawingArea();
            darea.ExposeEvent += OnExpose;

            darea.AddEvents ((int)Gdk.EventMask.ButtonPressMask);
            //darea.ButtonPressEvent += onButtonPress;
            ButtonPressEvent += onButtonPress;

            System.Console.WriteLine ("ctor");
            Add(darea);

            ShowAll();
        }

//.........这里部分代码省略.........
            MenuItem Help = new MenuItem ("Help");
            Help.Submenu = HelpMenu;

            MenuItem AboutMenuItem = new MenuItem("About");
            HelpMenu.Append (AboutMenuItem);

            MainMenuBar.Append (File);
            MainMenuBar.Append (Gesture);
            MainMenuBar.Append (Points);
            MainMenuBar.Append (Help);

            /*********************End of menu bar components*********************/

            //Drawing area which is the core component of the application
            dArea = new DrawingArea ();
            dArea.SetSizeRequest (500, 500);

            //Horizontal box (4 sections) which contains all of the buttons along the
            //bottom of the window
            HBox ButtonHBox = new HBox (false, 6);

            /*********************Start of Buttons*********************/

            Button BtnCreateGesture = new Button ("Create");
            Button BtnRecognizeGesture = new Button ("Recognize");
            Button BtnClearScreen = new Button ("Clear");
            Button BtnRecordPoints = new Button ("Record points");
            Button BtnChangeColour = new Button ("Change colour");

            //Button functions
            BtnCreateGesture.Clicked += new EventHandler (createGesture);
            BtnRecognizeGesture.Clicked += new EventHandler (recognizeGesture);
            BtnClearScreen.Clicked += new EventHandler (clearScreen);
            BtnRecordPoints.Clicked += new EventHandler (recordPoints);
            BtnChangeColour.Clicked += changeColour;

            //Adding buttons to the current horizontal box
            ButtonHBox.PackStart (BtnCreateGesture, true, false, 0);
            ButtonHBox.PackStart (BtnRecognizeGesture, true, false, 0);
            ButtonHBox.PackStart (BtnClearScreen, true, false, 0);
            ButtonHBox.PackStart (BtnRecordPoints, true, false, 0);
            ButtonHBox.PackStart (BtnChangeColour, true, false, 0);
            /*********************End of Buttons*********************/

            //Status bar which shows the score and recognized gesture
            sBar = new Statusbar ();
            sBar.Push (1, "Ready");

            //Entry box for batch function name to be used on the files
            batchFunctionName = new Entry ("Recorded points function name");
            batchFunctionName.AddEvents (
                (int)Gdk.EventMask.ButtonPressMask
            );
            batchFunctionName.ButtonPressEvent += clearTextBox;

            //Adding all components to the Vertical box
            MainVBox.PackStart (MainMenuBar, false, false, 0);
            MainVBox.PackStart (dArea, false, false, 0);
            MainVBox.PackStart (ButtonHBox, false, false, 0);
            MainVBox.PackStart (batchFunctionName, false, false, 0);
            MainVBox.PackStart (sBar, false, false, 0);

            Add (MainVBox);

            ShowAll ();

            //Surface 'pattern' for area to be covered
            surface = new ImageSurface(Format.Argb32, 500, 500);

            //Adding mouse events to the drawing area and assigning functions
            dArea.AddEvents(
                //Mouse Related Events
                (int)Gdk.EventMask.PointerMotionMask
                |(int)Gdk.EventMask.ButtonPressMask
                |(int)Gdk.EventMask.ButtonReleaseMask
            );

            //Repaint the Canvas Internally.
            dArea.ExposeEvent += OnDrawingAreaExposed;
            //Do this on MousePress inside Area
            dArea.ButtonPressEvent += OnMousePress;
            //Do this on MouseReleased inside Area
            dArea.ButtonReleaseEvent += OnMouseRelease;
            //Do this if a Motion Occurs inside the Drawing Area
            dArea.MotionNotifyEvent += OnMouseMotion2;

            //Assigning close function to the window
            DeleteEvent += delegate { Application.Quit(); };

            //Checking to see if bool for using the dot function is true
            //And assigning the required function as the delegate's operation
            //Note: This will always be true, no current way to switch while
            //application is running, has not been needed as of yet
            if (isDot) {
                Painter = new DrawShape (DrawDot);
                myoPainter = new DrawShape (DrawDot);
            } else {
                Painter = new DrawShape (DrawLine);
            }
        }

        private bool coordsActive_ = true; // Shows X,Y in Tooltip

        #endregion Fields

        #region Constructors

        /// <summary>
        /// Default Constructor
        /// </summary>
        public InteractivePlotSurface2D()
            : base()
        {
            canvas = new DrawingArea ();        // allocate local DrawingArea
            canvas.CanFocus = true;             // enable to receive the focus

            // Link the event handlers into the DrawingArea events (default is none)
            canvas.SizeAllocated        += new SizeAllocatedHandler      (SizeAllocated);
            canvas.ExposeEvent          += new ExposeEventHandler        (ExposeEvent);
            canvas.EnterNotifyEvent     += new EnterNotifyEventHandler   (EnterNotify);
            canvas.LeaveNotifyEvent     += new LeaveNotifyEventHandler   (LeaveNotify);
            canvas.ButtonPressEvent     += new ButtonPressEventHandler   (ButtonPress);
            canvas.MotionNotifyEvent    += new MotionNotifyEventHandler  (MotionNotify);
            canvas.ButtonReleaseEvent   += new ButtonReleaseEventHandler (ButtonRelease);
            canvas.ScrollEvent          += new ScrollEventHandler        (ScrollNotify);
            canvas.KeyPressEvent        += new KeyPressEventHandler      (KeyPressed);
            canvas.KeyReleaseEvent      += new KeyReleaseEventHandler    (KeyReleased);

            // Subscribe to DrawingArea mouse movement and button press events.
            // Enter and Leave notification is necessary to make ToolTips work.
            // Specify PointerMotionHint to prevent being deluged with motion events.
            canvas.AddEvents ((int)Gdk.EventMask.EnterNotifyMask);
            canvas.AddEvents ((int)Gdk.EventMask.LeaveNotifyMask);
            canvas.AddEvents ((int)Gdk.EventMask.ButtonPressMask);
            canvas.AddEvents ((int)Gdk.EventMask.ButtonReleaseMask);
            canvas.AddEvents ((int)Gdk.EventMask.PointerMotionMask);
            canvas.AddEvents ((int)Gdk.EventMask.PointerMotionHintMask);
            canvas.AddEvents ((int)Gdk.EventMask.ScrollMask);

            canvas.SetSizeRequest (400, 300);       // Set DrawingArea size

            // Set up ToolTips to show coordinates. NB works via Enter/Leave events
            // TODO: ToolTips do not work well yet - needs review of approach
            this.Canvas.TooltipText = "Coordinates will display here";
        }