OverlayWindowOptions.CustomPainter Property

Gets or sets an object used to paint a form.

Namespace: DevExpress.XtraSplashScreen

Assembly: DevExpress.XtraEditors.v24.2.dll

Declaration

C#

public IOverlayWindowPainter CustomPainter { get; set; }

VB.NET

Public Property CustomPainter As IOverlayWindowPainter

Property Value

Type	Description
DevExpress.XtraSplashScreen.IOverlayWindowPainter	An object that implements a custom paint logic.

Property Paths

You can access this nested property as listed below:

Library	Object Type	Path to CustomPainter
WinForms Controls	OverlayWindowOptions	.Default .CustomPainter
XAF: Cross-Platform .NET App UI & Web API	DefaultOverlayFormOptions	.Options .CustomPainter

Example

You can render an Overlay Form as follows:

• Inherit from the OverlayWindowPainterBase class.
• Override the Draw method.
• Pass the created object as a parameter to the ShowOverlayForm method.

The code snippet below shows how to display a custom message as in the following figure:

C#

using DevExpress.XtraSplashScreen;
using DevExpress.Utils.Drawing;
using System.Drawing;
//...
class CustomOverlayPainter : OverlayWindowPainterBase
{
    // Defines the string’s font.
    static readonly Font drawFont;
    static CustomOverlayPainter() {
        drawFont = new Font("Tahoma", 18);
    }
    protected override void Draw(OverlayWindowCustomDrawContext context)
    {
        //The Handled event parameter should be set to true. 
        //to disable the default drawing algorithm. 
        context.Handled = true;
        //Provides access to the drawing surface. 
        GraphicsCache cache = context.DrawArgs.Cache;
        //Adjust the TextRenderingHint option
        //to improve the image quality.
        cache.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
        //Overlapped control bounds. 
        Rectangle bounds = context.DrawArgs.Bounds;
        //Draws the default background. 
        context.DrawBackground();
        //Specify the string that will be drawn on the Overlay Form instead of the wait indicator.
        String drawString = "Please wait...";
        //Get the system's black brush.
        Brush drawBrush = Brushes.Black;
        //Calculate the size of the message string.
        SizeF textSize = cache.CalcTextSize(drawString, drawFont);
        //A point that specifies the upper-left corner of the rectangle where the string will be drawn.
        PointF drawPoint = new PointF(
            bounds.Left + bounds.Width / 2 - textSize.Width / 2,
            bounds.Top + bounds.Height / 2 - textSize.Height / 2
            );
        //Draw the string on the screen.
        cache.DrawString(drawString, drawFont, drawBrush, drawPoint);
    }
}
//...
IOverlaySplashScreenHandle handle = SplashScreenManager.ShowOverlayForm(this, customPainter: new CustomOverlayPainter());

VB.NET

Imports DevExpress.Utils.Drawing
Imports DevExpress.XtraSplashScreen
Imports System.Drawing
'...
Class CustomOverlayPainter
    Inherits OverlayWindowPainterBase
    'Defines the string’s font.
    Shared ReadOnly drawFont As Font

    Shared Sub New()
        drawFont = New Font("Tahoma", 18)
    End Sub

    Protected Overrides Sub Draw(context As OverlayWindowCustomDrawContext)
        'The Handled event parameter should be set to true  
        'to disable the default drawing algorithm.
        context.Handled = True
        'Provides access to the drawing surface. 
        Dim cache As GraphicsCache = context.DrawArgs.Cache
        'Adjust the TextRenderingHint option 
        ’to improve the image quality. 
        cache.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias
        'Overlapped control bounds.
        Dim bounds As Rectangle = context.DrawArgs.Bounds
        'Draws the default background.  
        context.DrawBackground()
        'Create the string to draw. 
        Dim drawString As String = "Please wait..."
        'Get the system black brush. 
        Dim drawBrush As Brush = Brushes.Black
        'Calculate the size of the message string. 
        Dim textSize As SizeF = cache.CalcTextSize(drawString, drawFont)
        'A point that specifies the upper-left corner of the rectangle where the string should be drawn.
        Dim drawPoint As PointF = New PointF(bounds.Left + bounds.Width / 2 - textSize.Width / 2, bounds.Top + bounds.Height / 2 - textSize.Height / 2)
        'Draw the string on the screen.
        cache.DrawString(drawString, drawFont, drawBrush, drawPoint)
    End Sub
End Class
'...
Dim handle As IOverlaySplashScreenHandle = SplashScreenManager.ShowOverlayForm(Me, customPainter:=New CustomOverlayPainter())