#849 – You Can Hold a RepeatButton Down

A Button fires its Click event when you press and release the left mouse button.  A RepeatButton, on the other hand, fires Click events continuously, as long as you continue holding the left mouse button down.

For example:

        <RepeatButton Content="Hold Me Down"
                      HorizontalAlignment="Center"
                      Margin="10" Padding="10,5"
                      Click="RepeatButton_Click"/>
        <TextBlock Text="{Binding MyCounter, Mode=OneWay}"
                   HorizontalAlignment="Center"
                   FontSize="48" Margin="20"/>

In the code-behind, we increment a counter every time the Click event is fired.

    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public MainWindow()
        {
            this.InitializeComponent();
            this.DataContext = this;
        }

        public event PropertyChangedEventHandler PropertyChanged = delegate { };

        private void RaisePropertyChanged(string propName)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propName));
        }

        private int myCounter = 0;
        public int MyCounter
        {
            get { return myCounter; }
            protected set
            {
                if (value != myCounter)
                {
                    myCounter = value;
                    RaisePropertyChanged("MyCounter");
                }
            }
        }

        private void RepeatButton_Click(object sender, RoutedEventArgs e)
        {
            MyCounter++;
        }
    }

The number increases while we hold the left mouse button down.