Moving a WPF 'element'? (C#)

Question

2.00/5 (2 votes)

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I find little helpful information with google and thought I'd ask here:

How do I move a WPF element, (e. g. a lable), from my running code?

this is what I have, (it's just a sandbox application I use for testing), in terms of code, (notice that the one line has a commented errorcode; this is code I've stolen from examples on the net):

My WPF:

XML

<Window x:Class="KeypressExperimental.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" removed="#CCCCCC" KeyDown="Window_KeyDown">
    <Grid>
        <ListBox Height="287" HorizontalAlignment="Left" Margin="263,12,0,0" Name="listBox1" VerticalAlignment="Top" Width="228" />
        <Canvas Height="287" HorizontalAlignment="Left" Margin="12,12,0,0" Name="canvas1" VerticalAlignment="Top" Width="245">
            <Label Content="Player" Height="28" Name="player" Background="#FF5DB15D" Width="45" Canvas.Left="93" Canvas.Top="125" />
        </Canvas>
    </Grid>
</Window>

My Code:

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace KeypressExperimental
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Up)
            {
                player.Margin.Top = 10; // Error:	"Cannot modify the return value of 'System.Windows.FrameworkElement.Margin' because it is not a variable"
            }
            else if (e.Key == Key.Down)
            {

            }
            else if (e.Key == Key.Left)
            {

            }
            else if (e.Key == Key.Right)
            {

            }
            else
            {
                listBox1.Items.Add(Convert.ToString(e.Key));
            }
            
        }
    }
}

Thanks!

-Frank

Posted 4-Mar-14 9:40am

Frank R. Haugen

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Frank R. Haugen · Accepted Answer · 2014-03-04T09:51:00

I'm an idiot!

I found the solutions just after asking this question:

C#

player.Margin = new Thickness(player.Margin.Left,
                        player.Margin.Top - 10,
                        player.Margin.Right,
                        player.Margin.Bottom);

This moves the label named "player" 10 pixels upwards.

At least there are s great solution for this now, as "thickness" wasn't something I intuitively associated with margin properties.

-Frank