private void UpdateCanExecute()
{
if (IsCommandExecuting)
{
return;
}
IsCommandExecuting = true;
try
{
//use our custom class as the parameter
var parameter = new CommandCanExecuteParameter(null);
CommandUtil.CanExecute(this, parameter);
//we set the current status independent on whether the command can execute
{
if (parameter.CurrentValue is bool)
{
IsChecked = (bool)parameter.CurrentValue;
}
else
{
IsChecked = false;
}
}
}
finally
{
IsCommandExecuting = false;
}
}
protected override void OnSelectionChanged(SelectionChangedEventArgs e)
{
base.OnSelectionChanged(e);
if (!IsCommandExecuting)
{
try
{
IsCommandExecuting = true;
CommandUtil.Execute(this);
}
finally { IsCommandExecuting = false; }
}
}
protected virtual void UpdateCanExecute()
{
if (IsCommandExecuting)
{
return;
}
ICommand cmd = Command;
if (cmd == null)
{
IsEnabled = true;
}
else
{
try
{
IsCommandExecuting = true;
IsEnabled = CommandUtil.CanExecute(this, CommandParameter);
var ca = new CommandCanExecuteParameter(CommandParameter);
CommandUtil.CanExecute(this, ca);
object value = ca.CurrentValue;
//if (value is RangedValue)
// value = ((RangedValue) value).Value;
object o = FindItemByData(value);
if (o == null && value == null)
{
Text = null;
SelectedItem = null;
}
else if (o != null && !Equals(SelectedItem, o))
{
SelectedItem = o;
}
else if (IsEditable && !IsReadOnly &&
value != null && Text != value.ToString())
{
Text = value.ToString();
}
}
finally { IsCommandExecuting = false; }
}
}
public static void IntializeCommandBindings(BaseRichTextBox richTextBox)
{
if (richTextBox == null)
{
return;
}
richTextBox.CommandBindings.Add(new BaseCommandBinding(
EditingCommands.ToggleBold,
(sender, e) => SetBold(richTextBox, !GetBold(richTextBox)),
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetBold(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
richTextBox.CommandBindings.Add(new BaseCommandBinding(
EditingCommands.ToggleItalic,
(sender, e) => SetItalic(richTextBox, !GetItalic(richTextBox)),
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetItalic(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
richTextBox.CommandBindings.Add(new BaseCommandBinding(
EditingCommands.ToggleUnderline,
(sender, e) => SetUnderline(richTextBox, !GetUnderline(richTextBox)),
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetUnderline(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
richTextBox.CommandBindings.Add(new BaseCommandBinding(
EditingCommands.AlignLeft,
(sender, e) => SetAlignLeft(richTextBox, !GetAlignLeft(richTextBox)),
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetAlignLeft(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
richTextBox.CommandBindings.Add(new BaseCommandBinding(
EditingCommands.AlignCenter,
(sender, e) => SetAlignCenter(richTextBox, !GetAlignCenter(richTextBox)),
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetAlignCenter(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
richTextBox.CommandBindings.Add(new BaseCommandBinding(
EditingCommands.AlignRight,
(sender, e) => SetAlignRight(richTextBox, !GetAlignRight(richTextBox)),
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetAlignRight(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
richTextBox.CommandBindings.Add(new BaseCommandBinding(
EditingCommands.AlignJustify,
(sender, e) => SetAlignJustify(richTextBox, !GetAlignJustify(richTextBox)),
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetAlignJustify(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
richTextBox.CommandBindings.Add(new BaseCommandBinding(
MyCommands.SetFontSize,
(sender, e) =>
{
if (e.Parameter is double)
{
SetFontSize(richTextBox, (double)e.Parameter);
}
},
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetFontSize(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
richTextBox.CommandBindings.Add(new BaseCommandBinding(
MyCommands.SetFontFamily,
(sender, e) =>
{
if (e.Parameter is FontFamily)
{
SetFontFamily(richTextBox, (FontFamily)e.Parameter);
}
},
(sender, e) =>
{
CommandUtil.SetCurrentValue(e, GetFontFamily(richTextBox));
e.CanExecute = true;
e.Handled = true;
}, richTextBox));
//richTextBox.CommandBindings.Add(new CommandBinding(
// MyCommands.SetFontColor,
// (sender, e) =>
// {
// if (e.Parameter is Color)
// {
// SetFontColor(richTextBox, (Color)e.Parameter);
// }
// },
// (sender, e) =>
// {
// CommandUtil.SetCurrentValue(e, GetFontColor(richTextBox));
// e.CanExecute = true;
// e.Handled = true;
// }));
}
