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InkOverlay.CursorDown Event

  • Articolo

InkOverlay.CursorDown Event

Occurs when the cursor tip contacts the digitizing tablet surface.

Definition

Visual Basic .NET Public Event CursorDown As InkCollectorCursorDownEventHandler
C# public event InkCollectorCursorDownEventHandler CursorDown;
Managed C++ public: __event InkCollectorCursorDownEventHandler CursorDown;

Remarks

The event handler receives an argument of type InkCollectorCursorDownEventArgs that contains data about this event.

When you create an InkCollectorCursorDownEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For performance reasons, the default event interest is off but is turned on automatically if you add an event handler.

Use this event carefully because it could have an adverse effect on ink performance if too much code is executed in the event handlers. To improve real-time ink performance, hide or show the mouse cursor in the MouseDown and MouseUp event handlers.

Examples

[C#]

This C# example demonstrates using several event handlers to display the state of the cursors, cursor buttons, and tablets. This simple application has a status bar with three panels (sbPanelCursor, sbPanelButton, and sbPanelTablet), where simple messages appear when events are received.

//...
using Microsoft.Ink;
//...
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.StatusBar statusBar1;
        private System.Windows.Forms.StatusBarPanel sbPanelCursor;
        private System.Windows.Forms.StatusBarPanel sbPanelButton;
        private System.Windows.Forms.StatusBarPanel sbPanelTablet;
        InkOverlay theInkOverlay;
//...

        public Form1()
        {
            //...

            // Initialize the InkOverlay with this form's
            // window handle.
            theInkOverlay = new InkOverlay(Handle);
            theInkOverlay.Enabled = true;

            // Add event handlers for cursor and button events.
            theInkOverlay.CursorButtonUp += new InkCollectorCursorButtonUpEventHandler(CursorButtonUp_Event);
            theInkOverlay.CursorButtonDown += new InkCollectorCursorButtonDownEventHandler(CursorButtonDown_Event);
            theInkOverlay.CursorOutOfRange += new InkCollectorCursorOutOfRangeEventHandler(CursorOutOfRange_Event);
            theInkOverlay.CursorInRange += new InkCollectorCursorInRangeEventHandler(CursorInRange_Event);
            theInkOverlay.CursorDown += new InkCollectorCursorDownEventHandler(CursorDown_Event);
            theInkOverlay.TabletAdded += new InkCollectorTabletAddedEventHandler(TabletAdded_Event);
            theInkOverlay.TabletRemoved += new InkCollectorTabletRemovedEventHandler(TabletRemoved_Event);
        }

//...

        private void CursorButtonUp_Event(object sender, InkCollectorCursorButtonUpEventArgs e)
        {
            sbPanelButton.Text = e.Button.Name + " Button Up";
        }

        private void CursorButtonDown_Event(object sender, InkCollectorCursorButtonDownEventArgs e)
        {
            sbPanelButton.Text = e.Button.Name + " Button Down";
        }

        private void CursorOutOfRange_Event(object sender, InkCollectorCursorOutOfRangeEventArgs e)
        {
            sbPanelCursor.Text = e.Cursor.Name + " Out of Range";
        }

        private void CursorInRange_Event(object sender, InkCollectorCursorInRangeEventArgs e)
        {
            sbPanelCursor.Text = e.Cursor.Name + " In Range";
        }

        private void CursorDown_Event(object sender, InkCollectorCursorDownEventArgs e)
        {
            sbPanelCursor.Text = e.Cursor.Name + " Down";
        }

        private void TabletAdded_Event(object sender, InkCollectorTabletAddedEventArgs e)
        {
            sbPanelTablet.Text = "Tablet added: " + e.Tablet.Name;
        }

        private void TabletRemoved_Event(object sender, InkCollectorTabletRemovedEventArgs e)
        {
            sbPanelTablet.Text = "Tablet removed: " + e.TabletId;
        }
//...

[Visual Basic .NET]

This Microsoft® Visual Basic® .NET example demonstrates using several event handlers to display the state of the cursors, cursor buttons, and tablets. This simple application has a status bar with three panels (sbPanelCursor, sbPanelButton, and sbPanelTablet), where simple messages appear when events are received.

Imports Microsoft.Ink
Public Class Form1
    Inherits System.Windows.Forms.Form

    Dim theInkOverlay As InkOverlay

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call
        theInkOverlay = New InkOverlay(Handle)
        theInkOverlay.Enabled = True
        AddHandler theInkOverlay.CursorButtonUp, AddressOf CursorButtonUp_Event
        AddHandler theInkOverlay.CursorButtonDown, AddressOf CursorButtonDown_Event
        AddHandler theInkOverlay.CursorOutOfRange, AddressOf CursorOutOfRange_Event
        AddHandler theInkOverlay.CursorInRange, AddressOf CursorInRange_Event
        AddHandler theInkOverlay.CursorDown, AddressOf CursorDown_Event
        AddHandler theInkOverlay.TabletAdded, AddressOf TabletAdded_Event
        AddHandler theInkOverlay.TabletRemoved, AddressOf TabletRemoved_Event

    End Sub

'...

#End Region

    Private Sub CursorButtonUp_Event( _
        ByVal sender As Object, _
        ByVal e As InkCollectorCursorButtonUpEventArgs)
        sbPanelButton.Text = e.Button.Name + " Button Up"
    End Sub

    Private Sub CursorButtonDown_Event( _
        ByVal sender As Object, _
        ByVal e As InkCollectorCursorButtonDownEventArgs)
        sbPanelButton.Text = e.Button.Name + " Button Down"
    End Sub

    Private Sub CursorOutOfRange_Event( _
        ByVal sender As Object, _
        ByVal e As InkCollectorCursorOutOfRangeEventArgs)
        sbPanelCursor.Text = e.Cursor.Name + " Out of Range"
    End Sub

    Private Sub CursorInRange_Event( _
        ByVal sender As Object, _
        ByVal e As InkCollectorCursorInRangeEventArgs)
        sbPanelCursor.Text = e.Cursor.Name + " In Range"
    End Sub

    Private Sub CursorDown_Event( _
        ByVal sender As Object, _
        ByVal e As InkCollectorCursorDownEventArgs)
        sbPanelCursor.Text = e.Cursor.Name + " Down"
    End Sub

    Private Sub TabletAdded_Event( _
        ByVal sender As Object, _
        ByVal e As InkCollectorTabletAddedEventArgs)
        sbPanelTablet.Text = "Tablet Added: " + e.Tablet.Name
    End Sub

    Private Sub TabletRemoved_Event( _
        ByVal sender As Object, _
        ByVal e As InkCollectorTabletRemovedEventArgs)
        sbPanelTablet.Text = "Tablet Removed: " + e.TabletId
    End Sub

End Class

See Also