Creating a RepeatButton
The RepeatButton XAML element
represents a WPF RepeatButton control.
<Button/>
The Width and Height
attributes represent the width and the height of a RepeatButton. The Content
property sets the text of button. The Name attribute represents the name of the
control, which is a unique identifier of a control.
The code snippet in Listing
1 creates a Button control and sets its name, height, width, and content.
<RepeatButton Margin="10,10,0,0"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Name="GrowButton"
Width="80" Height="30">
</RepeatButton>
Listing 1
The default property of a button is Content. The code
snippet in Listing 2 creates the same button as created by Listing 1.
<RepeatButton Margin="10,10,0,0"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Name="GrowButton"
Width="80" Height="30">
Grow
</RepeatButton>
Listing 2
The output looks like Figure 1.
Figure 1
Delay and Interval
The Delay and Interval properties make a RepeatButton
different than a normal button.
A RepeatButton is a button that fires Click events repeatedly when it is
pressed and held. The rate and aspects of repeating are determined by the Delay and Interval properties that the control exposes.
The code snippet in Listing 3 sets the Delay and Interval
properties.
<RepeatButton Margin="10,10,0,0"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Name="GrowButton"
Width="80" Height="30"
Delay="500" Interval="100"
>
Grow
</RepeatButton>
Listing 3
Adding a Button Click Event Handler
The Click attribute of a RepeatButton element adds the click
event handler and it keeps firing the event for the given Interval and delay
values. The code in Listing 4 adds the click event handler for a Button.
<Button x:Name="DrawCircleButton"
Height="40" Width="120"
Canvas.Left="10" Canvas.Top="10"
Content="Draw
Circle"
VerticalAlignment="Top"
HorizontalAlignment="Left">
Click="DrawCircleButton_Click"
</Button>
Listing 4
The code for the click event handler looks like following.
private void GrowButton_Click(object
sender, RoutedEventArgs e)
{
}
OK now let's write a useful application.
We are going to build an application with two buttons - Grow
and Shrink and a rectangle. The application looks like Figure 2.
Figure 2
When you click and keep pressing the Grow button, the width
of rectangle will keep growing and when you click on the Shrink button, the
width of rectangle will keep shrinking.
The final XAML code is listed in Listing 5.
<Window x:Class="RepeatButtonSample.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 Name="LayoutRoot">
<RepeatButton Margin="10,10,0,0"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Name="GrowButton"
Width="80" Height="30"
Delay="500" Interval="100"
Click="GrowButton_Click">
Grow
</RepeatButton>
<RepeatButton Margin="100,10,0,0"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Name="ShrinkButton"
Width="80" Height="30"
Delay="500" Interval="100"
Click="ShrinkButton_Click">
Shrink
</RepeatButton>
<Rectangle Name="Rect"
Height="100" Width="100"
Fill="Orange"/>
</Grid>
</Window>
Listing 5
Listing 6 is the click event handlers for the buttons that
change the width of rectangle.
private void GrowButton_Click(object
sender, RoutedEventArgs e)
{
Rect.Width += 10;
}
private void ShrinkButton_Click(object
sender, RoutedEventArgs e)
{
Rect.Width -= 10;
}
Listing 6