RadTextBoxBase

[Michal]

I want to create Control inherited from TextBoxBase, but I can't. TextBoxBase has an internal abstract method (getter) called TextBoxItem.get. Is this an error in control? How can I create my own text control with my RadTextBoxItem?

[Boryana]

Hello Michal,

Thank you for writing.

The RadTextBoxBase has an abstract RadTextBoxItem getter indeed. This, however is not an issue. The control was designed in such a manner. Would you please let us know how exactly you are customizing RadTextBoxItem? What is the functionality that the item is missing?

I am looking forward to your reply.

Kind regards,
Boryana
the Telerik team

[Michal]

For example, sometimes I need to reduce writing space to 3/4 of control with - I do it by send message EM_SetRect to the control (0x00b3) and it doesn't work :( When I override WndProc - there is no action on WM_SetFocus message (0x7), I can't override OnKeyPress method (debugger doesn't stop inside it). And so on...

[Boryana]

Hi Michal,

Thank you for writing back.

Have you tried setting Padding to the TextBoxElement, so that is shrinks the size of the nested TextBoxItem? For example, I have set a RadToggleButton that adds/subtracts 100 to/from the Right of TextBoxElement's Padding:

private void radToggleButton1_ToggleStateChanged(object sender, Telerik.WinControls.UI.StateChangedEventArgs args)
{
    Padding p = this.radTextBox1.TextBoxElement.Padding;
    if (args.ToggleState == Telerik.WinControls.Enumerations.ToggleState.On)
    {
        p.Right += 100;
    }
    else
    {
        p.Right -= 100;
    }
    this.radTextBox1.TextBoxElement.Padding = p;
}

If this is not what you are after, please share more information regarding your scenario.

All the best,
Boryana
the Telerik team

[Michal]

There is not what I need :( I need to draw an image on rest space of control, but I don't now how :(
And another (very big) problem: how to handle WM_Paste (for example) message from this control????

[Boryana]

Hi Michal,

Thank you for writing back.

Regarding your first question, please have a look at the following article: http://www.telerik.com/help/winforms/editors-textbox-adding-buttons-to-radtextbox.html. It contains useful information and code samples on how to implement scenario similar to yours.

Instead of handling WndProc and listening for WM_PASTE message, you should subscribe to the KeyPress event of the TextBoxItem and check if the KeyChar is '\x16'. Here is a sample implementation:

class MyTextBox: RadTextBox
{
    public MyTextBox()
    {
        this.textBoxItem.KeyPress += KeyPress;
    }

    protected void KeyPress(object sender,System.Windows.Forms.KeyPressEventArgs e)
    {
        switch (e.KeyChar)
        {
            //copy
            case '\x03':
                break;
            //paste
            case '\x16':
                break;
            //cut
            case '\x18':
                break;
        }
    }
}

Let me know whether my suggestions fit your requirements. I am looking forward to your reply.

Kind regards,
Boryana
the Telerik team

[Michal]

Yes, this article presents what I need, thank you.
But I'm not satisfied about your solution about WM_Paste message (this is only an example - I want to say there is no method of handling some messages in controls). KeyChar '\x16' is Ctrl-V, but what about Shift+Insert (paste too), popup menu and so on? With handling WM_Paste message I don't have to check multiple condtions...

[Boryana]

Hi Michal,

Thank you for writing back.

Unfortunately, there is no other way to handle pasting in a RadTextBox successor. WM_PASTE is a message queued only by a standard MS textbox and you will be able to handle it if you are inheriting from TextBox.

The only workaround in your scenario is to handle different keys combinations:

protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)
{
    switch (keyData)
    {
        //paste
        case Keys.Shift | Keys.Insert:
            break;
        //paste
        case Keys.Control | Keys.V:
            break;
        //copy
        case Keys.Control | Keys.C:
            break;
        //cut
        case Keys.Control | Keys.X:
            break;
    }
    return base.ProcessCmdKey(ref msg, keyData);
}

Let me know if you have further questions. I will do my best to assist you.

Greetings,
Boryana
the Telerik team