编辑

TabRenderer.IsSupported Property

  • Reference

Definition

Namespace:
System.Windows.Forms
Assembly:
System.Windows.Forms.dll

Gets a value indicating whether the TabRenderer class can be used to draw a tab control with visual styles.

public:
 static property bool IsSupported { bool get(); };
public static bool IsSupported { get; }
static member IsSupported : bool
Public Shared ReadOnly Property IsSupported As Boolean

Property Value

Boolean

true if the user has enabled visual styles in the operating system and visual styles are applied to the client area of application windows; otherwise, false.

Examples

The following code example uses the IsSupported property to determine whether to use the DrawTabPage and DrawTabItem methods. This code example is part of a larger example provided for the TabRenderer class.

    // Draw the tab page and the tab items.
protected:
    virtual void OnPaint(PaintEventArgs^ e) override
    {
        __super::OnPaint(e);

        if (!TabRenderer::IsSupported)
        {
            this->Parent->Text = "CustomTabControl Disabled";
            return;
        }

        TabRenderer::DrawTabPage(e->Graphics, tabPageRectangle);
        TabRenderer::DrawTabItem(e->Graphics, tabItemRectangle1,
            tab1Text, this->Font, tab1Focused, tab1State);
        TabRenderer::DrawTabItem(e->Graphics, tabItemRectangle2,
            tab2Text, this->Font, tab2Focused, tab2State);

        this->Parent->Text = "CustomTabControl Enabled";
    }

// Draw the tab page and the tab items.
protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);

    if (!TabRenderer.IsSupported)
    {
        this.Parent.Text = "CustomTabControl Disabled";
        return;
    }

    TabRenderer.DrawTabPage(e.Graphics, tabPageRectangle);
    TabRenderer.DrawTabItem(e.Graphics, tabItemRectangle1,
        tab1Text, this.Font, tab1Focused, tab1State);
    TabRenderer.DrawTabItem(e.Graphics, tabItemRectangle2,
        tab2Text, this.Font, tab2Focused, tab2State);

    this.Parent.Text = "CustomTabControl Enabled";
}

' Draw the tab page and the tab items.
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
    MyBase.OnPaint(e)

    If Not TabRenderer.IsSupported Then
        Me.Parent.Text = "CustomTabControl Disabled"
        Return
    End If

    TabRenderer.DrawTabPage(e.Graphics, tabPageRectangle)
    TabRenderer.DrawTabItem(e.Graphics, tabItemRectangle1, _
        tab1Text, Me.Font, tab1Focused, tab1State)
    TabRenderer.DrawTabItem(e.Graphics, tabItemRectangle2, _
        tab2Text, Me.Font, tab2Focused, tab2State)
    Me.Parent.Text = "CustomTabControl Enabled"
End Sub

Remarks

If this property is false, the DrawTabPage and DrawTabItem methods will throw an InvalidOperationException.

Applies to

See also