Custom control problems(EDIT)

Question

 

I am making a custom control with a label that pops up on double click a textbox wich returns text to the label on double click, enter or lose focus. It also centers itself beneath another control.

 

I got a couple of problems:

1. The centering doesn't occur when the custom control tries to extend beyond the above control's left side, it continues to extend to the right instead of centering.

2. When the textbox pops up it doesn't receive focus from the Focus() method or keyboard input, instead the user must push the textbox again for it to gain focus and keyboard input.

 

Project download:

http://files.filefront.com/WpfApplication13rar/;9222886;/fileinfo.html

 

EDIT: Problem 2 solved with:

 

Code Block

void textBox_Loaded(object sender, RoutedEventArgs e)

{

textBox.Focus();

textBox.Select(0, textBox.Text.Length);

e.Handled = true;

}

 

 

Problem 1 isn't a real issue anymore because it's solved in my main app, however remains a curiosity.

Answer 1

Hi w0lfshad3

 

I think that this is because the calculation formula is not right. The following example has similar situation which shows how to center the TextBox control.

 

Code Block

namespace ForumProjects

{

    public partial class MainWindow : Window

    {

        private void TextBox_TextChanged(object sender, TextChangedEventArgs e)

        {

            if (!this.TheButton.IsLoaded || !this.TheTextBox.IsLoaded) return;

 

            double buttonHoriCenter = this.TheButton.ActualWidth / 2 + Canvas.GetLeft(this.TheButton);

            double textBoxWidth = this.TheTextBox.ActualWidth;

            double textBoxLeft = buttonHoriCenter - textBoxWidth / 2;

            Canvas.SetLeft(this.TheTextBox, textBoxLeft);

        }

    }

}

<Window x:Class="ForumProjects.MainWindow"

       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

       x:Name="TheWindow" Title="MainWindow" Height="600" Width="800">

    <Window.Resources>

    </Window.Resources>

 

    <Canvas Name="RootLayout" Background="AliceBlue">

        <Button Name="TheButton" Width="100" Height="100" Canvas.Left="50" Canvas.Top="50"/>

        <TextBox Name="TheTextBox" Canvas.Left="80" Canvas.Top="150" TextChanged="TextBox_TextChanged">TTTTTT</TextBox>

    </Canvas>

</Window>

 

 

Best Regards,

Wei Zhou