Question

我正在使用从MenuButton继承的自定义Button（没有xaml文件）：

    public class MenuButton : Button
    {
        public MenuButton()
        {
            base.Click += click;
            base.MouseLeave += mouseleave;
        }
        public MenuButton(string caption, ICommand command)
            : this()
        {
            SetValue(ContentProperty, caption);
            Caption = caption;
            Commando = command;
        }

        public override void OnApplyTemplate()
        {
            this.Style = FindResource("MenuButton") as Style;
            base.OnApplyTemplate();
        }

        public ICommand Commando;
        public string Caption;

        void mouseleave(object sender, MouseEventArgs e)
        {
            if (selected)
            {
                 SetValue(BackgroundProperty, Brushes.Crimson);
            }
            else
            {
                SetValue(BackgroundProperty, Brushes.Transparent);
            }
        }

        bool selected = false;

        void click(object sender, RoutedEventArgs e)
        {
            MenuButtons menu = null;

                DependencyObject dep = e.OriginalSource as DependencyObject;
                while (dep != null && !(dep is ItemsPresenter))
                {
                    dep = VisualTreeHelper.GetParent(dep);
                }
                var a = dep as FrameworkElement;
                menu = a.DataContext as MenuButtons;

            foreach (var item in menu.MenuItems)
            {
                if (item == sender)
                {
                    SetValue(ForegroundProperty, Brushes.White);
                    SetValue(BackgroundProperty, Brushes.Crimson);
                    selected = true;
                }
                else
                {
                    item.SetValue(ForegroundProperty, Brushes.Black);
                    item.SetValue(BackgroundProperty, Brushes.Transparent);
                    item.selected = false;
                }
            }

            Commando.Execute(null);
        }
    }
}

我应用以下样式：

<Style x:Key="MenuButton"
           BasedOn="{StaticResource {x:Static ToolBar.ButtonStyleKey}}"
           TargetType="{x:Type c:MenuButton}">
        <Setter Property="SnapsToDevicePixels"
                Value="True" />
        <Setter Property="BorderThickness"
                Value="0" />
        <Setter Property="DockPanel.Dock"
                Value="Left" />
        <Setter Property="Margin"
                Value="0" />
        <Setter Property="Padding"
                Value="8" />
        <Setter Property="FontSize"
                Value="11" />
        <Setter Property="FontFamily"
                Value="Verdana" />
</Style>

这很有效，ToolBar.ButtonStyleKey提供了漂亮的蓝色/灰色悬停颜色。在后面的代码中，我想根据每个按钮“选中”状态设置前景色和背景色。在事件void click(object sender, RoutedEventArgs e)中，我为数组中的所有菜单项设置了这些颜色（它们在用户控件中分组）。

foreach (var item in menu.MenuItems)
{
    if (item == sender)
    {
        SetValue(ForegroundProperty, Brushes.White);
        SetValue(BackgroundProperty, Brushes.Crimson);
        selected = true;
    }
    else
    {
        item.SetValue(ForegroundProperty, Brushes.Black);
        item.SetValue(BackgroundProperty, Brushes.Transparent);
        item.selected = false;
    }
}

现在前景色变好了。但背景颜色可能会被ToolBar.ButtonStyleKey覆盖，并保持蓝色/灰色！只有当我点击另一个 MenuButton时，深红色才出现在我刚刚离开按钮上。奇怪的是我无法正确设置背景，我怎么能解决这个问题，而不用编写恶魔般的ControlTemplates？

Wpf按钮背景不会从后面的代码更改

0 个答案: