TrackBarRenderer.GetTopPointingThumbSize(Graphics, TrackBarThumbState) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Returns the size, in pixels, of the track bar slider (also known as the thumb) that points up.
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
Parameters
- state
- TrackBarThumbState
One of the TrackBarThumbState values that specifies the visual state of the slider.
Returns
A Size that specifies the size, in pixels, of the slider.
Exceptions
The operating system does not support visual styles.
-or-
Visual styles are disabled by the user in the operating system.
-or-
Visual styles are not applied to the client area of application windows.
Examples
The following code example uses the GetTopPointingThumbSize method to determine the size of the rectangle used by the DrawTopPointingThumb method to draw the slider. This code example is part of a larger example provided for the TrackBarRenderer class.
// 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
Remarks
The size of the slider is determined by the current visual style of the operating system.
Before calling this method, you should verify that the value of the IsSupported property is true
.
Applies to
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