TrackBarRenderer.GetTopPointingThumbSize(Graphics, TrackBarThumbState) Metode

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Sumber:

TrackBarRenderer.cs

Mengembalikan ukuran, dalam piksel, slider bilah trek (juga dikenal sebagai ibu jari) yang menunjuk ke atas.

public:
 static System::Drawing::Size GetTopPointingThumbSize(System::Drawing::Graphics ^ g, System::Windows::Forms::VisualStyles::TrackBarThumbState state);

public static System.Drawing.Size GetTopPointingThumbSize(System.Drawing.Graphics g, System.Windows.Forms.VisualStyles.TrackBarThumbState state);

static member GetTopPointingThumbSize : System.Drawing.Graphics * System.Windows.Forms.VisualStyles.TrackBarThumbState -> System.Drawing.Size

Public Shared Function GetTopPointingThumbSize (g As Graphics, state As TrackBarThumbState) As Size

Parameter

g

Graphics

Operasi Graphics ini akan menggunakan.

state

TrackBarThumbState

Salah TrackBarThumbState satu nilai yang menentukan status visual slider.

Mengembalikan

Size

Size Yang menentukan ukuran, dalam piksel, penggerak.

Pengecualian

InvalidOperationException

Sistem operasi tidak mendukung gaya visual.

-atau-

Gaya visual dinonaktifkan oleh pengguna dalam sistem operasi.

-atau-

Gaya visual tidak diterapkan ke area klien jendela aplikasi.

Contoh

Contoh kode berikut menggunakan GetTopPointingThumbSize metode untuk menentukan ukuran persegi panjang yang digunakan oleh DrawTopPointingThumb metode untuk menggambar penggeser. Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk TrackBarRenderer kelas .

    // Calculate the sizes of the bar, thumb, and ticks rectangle.
private:
    void SetupTrackBar()
    {
        if (!TrackBarRenderer::IsSupported)
        {
            return;
        }

        Graphics^ g = this->CreateGraphics();

        // Calculate the size of the track bar.
        trackRectangle.X = ClientRectangle.X + 2;
        trackRectangle.Y = ClientRectangle.Y + 28;
        trackRectangle.Width = ClientRectangle.Width - 4;
        trackRectangle.Height = 4;

        // Calculate the size of the rectangle in which to
        // draw the ticks.
        ticksRectangle.X = trackRectangle.X + 4;
        ticksRectangle.Y = trackRectangle.Y - 8;
        ticksRectangle.Width = trackRectangle.Width - 8;
        ticksRectangle.Height = 4;

        tickSpace = ((float)ticksRectangle.Width - 1) /
            ((float)numberTicks - 1);

        // Calculate the size of the thumb.
        thumbRectangle.Size =
            TrackBarRenderer::GetTopPointingThumbSize(g,
            TrackBarThumbState::Normal);

        thumbRectangle.X = CurrentTickXCoordinate();
        thumbRectangle.Y = trackRectangle.Y - 8;
    }

// Calculate the sizes of the bar, thumb, and ticks rectangle.
private void SetupTrackBar()
{
    if (!TrackBarRenderer.IsSupported)
        return;

    using (Graphics g = this.CreateGraphics())
    {
        // Calculate the size of the track bar.
        trackRectangle.X = ClientRectangle.X + 2;
        trackRectangle.Y = ClientRectangle.Y + 28;
        trackRectangle.Width = ClientRectangle.Width - 4;
        trackRectangle.Height = 4;

        // Calculate the size of the rectangle in which to 
        // draw the ticks.
        ticksRectangle.X = trackRectangle.X + 4;
        ticksRectangle.Y = trackRectangle.Y - 8;
        ticksRectangle.Width = trackRectangle.Width - 8;
        ticksRectangle.Height = 4;

        tickSpace = ((float)ticksRectangle.Width - 1) /
            ((float)numberTicks - 1);

        // Calculate the size of the thumb.
        thumbRectangle.Size =
            TrackBarRenderer.GetTopPointingThumbSize(g,
            TrackBarThumbState.Normal);

        thumbRectangle.X = CurrentTickXCoordinate();
        thumbRectangle.Y = trackRectangle.Y - 8;
    }
}

' Calculate the sizes of the bar, thumb, and ticks rectangle.
Private Sub SetupTrackBar()
    If Not TrackBarRenderer.IsSupported Then
        Return
    End If
    Using g As Graphics = Me.CreateGraphics()
        ' Calculate the size of the track bar.
        trackRectangle.X = ClientRectangle.X + 2
        trackRectangle.Y = ClientRectangle.Y + 28
        trackRectangle.Width = ClientRectangle.Width - 4
        trackRectangle.Height = 4

        ' Calculate the size of the rectangle in which to 
        ' draw the ticks.
        ticksRectangle.X = trackRectangle.X + 4
        ticksRectangle.Y = trackRectangle.Y - 8
        ticksRectangle.Width = trackRectangle.Width - 8
        ticksRectangle.Height = 4

        tickSpace = (CSng(ticksRectangle.Width) - 1) / _
            (CSng(numberTicks) - 1)

        ' Calculate the size of the thumb.
        thumbRectangle.Size = _
            TrackBarRenderer.GetTopPointingThumbSize( _
            g, TrackBarThumbState.Normal)

        thumbRectangle.X = CurrentTickXCoordinate()
        thumbRectangle.Y = trackRectangle.Y - 8
    End Using
End Sub

Keterangan

Ukuran slider ditentukan oleh gaya visual sistem operasi saat ini.

Sebelum memanggil metode ini, Anda harus memverifikasi bahwa nilai IsSupported properti adalah true.