InkCanvas.SelectionResizing 事件

定義

命名空間:

System.Windows.Controls

組件:

PresentationFramework.dll

在調整所選取的筆劃及項目大小之前發生。

public:
 event System::Windows::Controls::InkCanvasSelectionEditingEventHandler ^ SelectionResizing;

public event System.Windows.Controls.InkCanvasSelectionEditingEventHandler SelectionResizing;

member this.SelectionResizing : System.Windows.Controls.InkCanvasSelectionEditingEventHandler 

Public Custom Event SelectionResizing As InkCanvasSelectionEditingEventHandler 

事件類型

InkCanvasSelectionEditingEventHandler

範例

下列範例會防止使用者選取小於其原始大小。

Rect selectionBounds;

// Don't allow the user to make the selection smaller than its original size.
void inkCanvas1_SelectionResizing(object sender, InkCanvasSelectionEditingEventArgs e)
{
    if (selectionBounds == null || selectionBounds.IsEmpty)
    {
        return;
    }

    double resizeHeight;
    double resizeWidth;

    // If the user made the height of the selection smaller, 
    // use the selection's original height.
    if (e.NewRectangle.Height < selectionBounds.Height)
    {
        resizeHeight = selectionBounds.Height;
    }
    else
    {
        resizeHeight = e.NewRectangle.Height;
    }

    // If the user made the width of the selection smaller, 
    // use the selection's original width.
    if (e.NewRectangle.Width < selectionBounds.Width)
    {
        resizeWidth = selectionBounds.Width;
    }
    else
    {
        resizeWidth = e.NewRectangle.Width;
    }

    // Create a the new rectangle with the appropriate width and height.
    e.NewRectangle = new Rect(e.NewRectangle.X, e.NewRectangle.Y, resizeWidth, resizeHeight);
}

// Keep track of the selection bounds.
void inkCanvas1_SelectionChanged(object sender, EventArgs e)
{
    selectionBounds = inkCanvas1.GetSelectionBounds();
}

Private selectionBounds As Rect

' Don't allow the user to make the selection smaller than its original size.
Private Sub inkCanvas1_SelectionResizing(ByVal sender As Object, ByVal e As InkCanvasSelectionEditingEventArgs)

    If selectionBounds.IsEmpty Then
        Return
    End If

    Dim resizeHeight As Double
    Dim resizeWidth As Double

    ' If the user made the height of the selection smaller, 
    ' use the selection's original height.
    If e.NewRectangle.Height < selectionBounds.Height Then
        resizeHeight = selectionBounds.Height
    Else
        resizeHeight = e.NewRectangle.Height
    End If

    ' If the user made the width of the selection smaller, 
    ' use the selection's original width.
    If e.NewRectangle.Width < selectionBounds.Width Then
        resizeWidth = selectionBounds.Width
    Else
        resizeWidth = e.NewRectangle.Width
    End If

    ' Create a the new rectangle with the appropriate width and height.
    e.NewRectangle = New Rect(e.NewRectangle.X, e.NewRectangle.Y, resizeWidth, resizeHeight)

End Sub


' Keep track of the selection bounds.
Private Sub inkCanvas1_SelectionChanged(ByVal sender As Object, ByVal e As EventArgs)

    selectionBounds = inkCanvas1.GetSelectionBounds()

End Sub

備註

當使用者要求重設筆劃和/或元素的選取範圍，但在套用變更之前，就會發生此事件。

事件處理常式會收到類型的 InkCanvasSelectionEditingEventArgs 引數，其中包含兩個屬性： OldRectangle 和 NewRectangle 。 OldRectangle 定義調整大小作業之前選取範圍的界限，並在 NewRectangle 調整大小作業之後定義選取範圍的界限。

使用新的大小更新筆劃和/或專案之後，就會 SelectionResized 引發 事件。

另請參閱

• SelectionResized
• GetSelectedStrokes()
• GetSelectedElements()