I have a group of WPF CheckBoxes that have a Checked event handler that handles some logic when the user clicks on one of them. However, I also have a "Clear All" button that, when clicked, will clear all the checkboxes. If the user clicks on the "Clear All" button, I do NOT want the checkboxes to fire their Checked event. Is there a way of doing this?
views:
37answers:
2
A:
It would be ideal to disable the event but I don't know how that would be done.
Though it would be just as easy to add a boolean to keep track if whether or not the "Clear All" button was pressed. Then only do the Unchecked code if it wasn't unchecked through the button.
private bool clearAllClicked = false;
private void button_Click(object sender, RoutedEventArgs e)
{
clearAllClicked = true;
checkbox.IsChecked = false;
clearAllClicked = false;
}
private void checkbox_Unchecked(object sender, RoutedEventArgs e)
{
if (!clearAllClicked)
{
//do stuff
}
}
Jeff M
2010-07-22 03:33:44
This is a viable solution, but I'd like to prevent against having to create another variable if possible.
Daniel T.
2010-08-27 01:56:53
A:
Remove the event handler at the beginning of the in the Clear All button's event handler and then re-add the event handler at the end of the Clear All button's event handler.
Here's a dirty sample:
XAML
<Window x:Class="UncheckedTest.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Grid>
<CheckBox Height="16" Margin="22,30,136,0" Name="checkBox1" VerticalAlignment="Top"
Unchecked="checkBox1_Unchecked">CheckBox 1</CheckBox>
<CheckBox Height="16" Margin="22,76,136,0" Name="checkBox2" VerticalAlignment="Top"
Unchecked="checkBox2_Unchecked">CheckBox 2</CheckBox>
<CheckBox Margin="22,0,136,121" Name="checkBox3" Height="16" VerticalAlignment="Bottom"
Unchecked="checkBox3_Unchecked">CheckBox 3</CheckBox>
<Button HorizontalAlignment="Right" Margin="0,118,37,121" Name="button1" Width="87"
Click="button1_Click">Uncheck All</Button>
<TextBox Height="74" Margin="22,0,20,13" Name="textBox1" VerticalAlignment="Bottom"
TextWrapping="Wrap" VerticalScrollBarVisibility="Visible" />
</Grid>
</Window>
Code Behind
using System;
using System.Windows;
namespace UncheckedTest
{
/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>
public partial class Window1 : Window
{
private int i = 1;
public Window1()
{
InitializeComponent();
}
void checkBox3_Unchecked(object sender, RoutedEventArgs e)
{
textBox1.Text = i++.ToString() + ". Checkbox 3 Unchecked." + Environment.NewLine + textBox1.Text;
}
void checkBox2_Unchecked(object sender, RoutedEventArgs e)
{
textBox1.Text = i++.ToString() + ". Checkbox 2 Unchecked." + Environment.NewLine + textBox1.Text;
}
void checkBox1_Unchecked(object sender, RoutedEventArgs e)
{
textBox1.Text = i++.ToString() + ". Checkbox 1 Unchecked." + Environment.NewLine + textBox1.Text;
}
private void button1_Click(object sender, RoutedEventArgs e)
{
checkBox1.Unchecked -= checkBox1_Unchecked;
checkBox2.Unchecked -= checkBox2_Unchecked;
checkBox3.Unchecked -= checkBox3_Unchecked;
checkBox1.IsChecked = false;
checkBox2.IsChecked = false;
checkBox3.IsChecked = false;
checkBox1.Unchecked += checkBox1_Unchecked;
checkBox2.Unchecked += checkBox2_Unchecked;
checkBox3.Unchecked += checkBox3_Unchecked;
}
}
}
Metro Smurf
2010-07-22 04:01:58
Thanks, this solution seems a bit hack-ish but is probably the best way to go. Another viable solution is the one provided by Jeff, to create a variable that's checked to see if it should process the `Checked` logic.
Daniel T.
2010-08-27 01:58:26