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Custom shaped Screen Tips

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This is a migrated thread and some comments may be shown as answers.
Daniel
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Daniel asked on 27 Mar 2020, 12:43 PM

Is it possible to have a custom shaped screen tip? 

I have created a custom screen tip class, set the Shape property of the element to be a shape and it appears to work visually but it's leaving a grey background in the spots where I want it to be transparent. See attached. 

 

I have also tried doing the same but with an image, making the background of the image transparent, but the same thing happens. 

 

Thanks. 

 

 

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Nadya
Telerik team
answered on 27 Mar 2020, 01:11 PM

Hello Daniel,

Please refer to the following code snippet in order to avoid that gray rectangle behind the custom shape of the screen tip:

 public RadForm1()
        {
            InitializeComponent();
            this.radButton1.ScreenTipNeeded += this.NewRadButton1_ScreenTipNeeded;
        }
        private void NewRadButton1_ScreenTipNeeded(object sender, Telerik.WinControls.ScreenTipNeededEventArgs e)
        {

            PropertyInfo barProperty = ((ComponentBehavior)this.radButton1.Behavior).GetType().GetProperty("ScreenPresenter",
                                                                                                      BindingFlags.NonPublic | BindingFlags.Instance);
            Form screenTipForm = barProperty.GetValue(((ComponentBehavior)this.radButton1.Behavior), null) as Form;

            screenTipForm.BackColor = this.BackColor;
            screenTipForm.TransparencyKey = this.BackColor;

            IntPtr hWnd = screenTipForm.Handle;
            int GCL_STYLE = -26;
            int ClassLong = NativeMethods.GetClassLongPtr(new HandleRef(null, hWnd), GCL_STYLE).ToInt32();
            if ((ClassLong & NativeMethods.CS_DROPSHADOW) != 0)
            {
                ClassLong ^= NativeMethods.CS_DROPSHADOW;
                NativeMethods.SetClassLong(new HandleRef(null, hWnd), GCL_STYLE, (IntPtr)ClassLong);
            }
        }

I hope this helps. Do not hesitate to contact us if you have other questions.

Regards,
Nadya
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Daniel
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answered on 27 Mar 2020, 02:48 PM

Worked like a charm. 

Thanks! 

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Nadya
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Daniel
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