RichEditBox 使用自定义菜单

老周：当RichEditBox控件的上下文菜单即将弹出时，会引发ContextMenuOpening事件，我们需要处理该事件，并且将e.Handled属性设置为true，这样才能阻止默认上下文菜单的弹出

在RichEditBox控件上声明附加的菜单项

<RichEditBox Name="redit" Grid.Row="3" Margin="10,10,10,10" ContextMenuOpening="OnContextMenuOpening">
<FlyoutBase.AttachedFlyout>
<MenuFlyout>
<MenuFlyoutItem Text="复制" Click="OnCopy"/>
<MenuFlyoutItem Text="剪切" Click="OnCut"/>
<MenuFlyoutItem Text="粘贴" Click="OnPaste"/>
<MenuFlyoutSeparator/>
<MenuFlyoutSubItem Text="字号">
<MenuFlyoutItem Text="16" Tag="16" Click="OnFontSize" />
<MenuFlyoutItem Text="20" Tag="20" Click="OnFontSize"/>
<MenuFlyoutItem Text="24" Tag="24" Click="OnFontSize" />
<MenuFlyoutItem Text="36" Tag="36" Click="OnFontSize"/>
<MenuFlyoutItem Text="48" Tag="48" Click="OnFontSize"/>
</MenuFlyoutSubItem>
<!--分割-->
<MenuFlyoutSeparator/>
<ToggleMenuFlyoutItem Text="加粗" Click="OnBold" />
<MenuFlyoutSeparator/>
<MenuFlyoutSubItem Text="下划线">
<MenuFlyoutItem Text="无" Tag="-1" Click="OnUnderline" />
<MenuFlyoutItem Text="单实线" Tag="0" Click="OnUnderline"/>
<MenuFlyoutItem Text="双实线" Tag="1" Click="OnUnderline"/>
<MenuFlyoutItem Text="虚线" Tag="2" Click="OnUnderline"/>
</MenuFlyoutSubItem>
<MenuFlyoutSeparator/>
<MenuFlyoutSubItem Text="颜色">
<MenuFlyoutItem Text="黑色" Tag="黑色" Click="OnTinct"/>
<MenuFlyoutItem Text="蓝色" Tag="蓝色" Click="OnTinct"/>
<MenuFlyoutItem Text="白色" Tag="白色" Click="OnTinct"/>
</MenuFlyoutSubItem>
</MenuFlyout>
</FlyoutBase.AttachedFlyout>
</RichEditBox>

处理OnContextMenuOpening

private void OnContextMenuOpening(object sender , ContextMenuEventArgs e)
{
//阻止弹出默认的上下文菜单，然后，调用ShowAt方法在指定的坐标处打开菜单
e.Handled = true;
MenuFlyout menu = FlyoutBase.GetAttachedFlyout(redit) as MenuFlyout;
menu?.ShowAt(redit , new Point(e.CursorLeft , e.CursorTop));
}

处理复制粘贴

private void OnCopy(object sender , RoutedEventArgs e)
{
//复制
redit.Document.Selection.Copy();
}

private void OnCut(object sender , RoutedEventArgs e)
{
//剪切
redit.Document.Selection.Cut();
}

private void OnPaste(object sender , RoutedEventArgs e)
{
//粘贴
redit.Document.Selection.Paste(0);
//Paste 要在粘贴操作中使用的剪贴板格式。零表示最佳格式
}

处理OnFontSize

/// <summary>
/// 设置字体
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnFontSize(object sender , RoutedEventArgs e)
{
MenuFlyoutItem item = sender as MenuFlyoutItem;
// 获取字号
float size = Convert.ToSingle(item.Tag);

redit.Document.Selection.CharacterFormat.Size = size;
}

/// <summary>
/// 加粗
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnBold(object sender , RoutedEventArgs e)
{
//using Windows.UI.Text;
ToggleMenuFlyoutItem item = sender as ToggleMenuFlyoutItem;
redit.Document.Selection.CharacterFormat.Bold = item.IsChecked ? FormatEffect.On : FormatEffect.Off;
}

private void OnUnderline(object sender , RoutedEventArgs e)
{
MenuFlyoutItem item = sender as MenuFlyoutItem;
int x = Convert.ToInt32(item.Tag);
UnderlineType unlinetp;
switch (x)
{
case -1: // 无
unlinetp = UnderlineType.None;
break;
case 0: // 单实线
unlinetp = UnderlineType.Single;
break;
case 1: // 双实线
unlinetp = UnderlineType.Double;
break;
case 2: // 虚线
unlinetp = UnderlineType.Dash;
break;
default:
unlinetp = UnderlineType.None;
break;
}
redit.Document.Selection.CharacterFormat.Underline = unlinetp;
}

private void OnTinct(object sender , RoutedEventArgs e)
{
MenuFlyoutItem item = sender as MenuFlyoutItem;
string tinct = item.Tag as string;
Windows.UI.Color color = new Windows.UI.Color();
switch (tinct)
{
case "黑色":
color= Windows.UI.Colors.Black;
break;
case "蓝色":
color = Windows.UI.Colors.Blue;
break;
case "白色":
color = Windows.UI.Colors.White;
break;
default:
break;
}
redit.Document.Selection.CharacterFormat.BackgroundColor = color;
}

颜色在Windows.UI.Color

里面代码都是抄老周的



参考：http://www.cnblogs.com/tcjiaan/p/4937301.html