Question

I have a list of toggle-buttons in wpf and I want the user to be able to toggle several buttons by dragging over them. To do this, I used the MouseEnter-Event for each button. This does work, when I press the mousebutton outside the buttons and start dragging. But when I press the mousebutton on a button and start dragging, the MouseEnter-Event is only fired for the first button, where I pressed the mousebutton (also none of the other events like mouseover or mousemove are fired).
Here s the code:

public void AddButton()
{
    ToggleButton btn = new ToggleButton();
    btn.MouseEnter += VisibilityButton_Enter;
    this.gridButtons.Children.Add(btn);
}

private void VisibilityButton_Enter(object sender, MouseEventArgs e)
{
    if (e.LeftButton == MouseButtonState.Pressed || e.RightButton == MouseButtonState.Pressed)
    {
        ToggleButton btn = sender as ToggleButton;
        btn.IsChecked = !btn.IsChecked;
    }
}

我找到了使用“rag和 drop”和“vent花”的办法,但我认为必须找到一个更容易的解决办法?

Answer 1

正如肯特提到的那样,ToggleButton捕获了这些 mo。如果我们处理<代码> 预估会节目活动本身,我们可以预防。其余部分只是停留在 mo状态的轨道上,因此,我们在一次滚动期间没有两次点击。这里,你可以在你ton子上添加一种行为,使滚动点击成为可能。

首先添加这一名称空间:

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

and the corresponding reference to your project.

之后,XAML就认为了这一点(请注意):

<Grid>
    <ItemsControl>
        <ItemsControl.ItemsSource>
            <PointCollection>
                <Point/>
                <Point/>
                <Point/>
                <Point/>
                <Point/>
            </PointCollection>
        </ItemsControl.ItemsSource>
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <ToggleButton Width="25" Height="25">
                    <i:Interaction.Behaviors>
                        <local:RollOverBehavior/>
                    </i:Interaction.Behaviors>
                </ToggleButton>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</Grid>

这里是行为本身:

public class RollOverBehavior : Behavior<ToggleButton>
{
    bool mouseOver;
    bool clicked;

    protected override void OnAttached()
    {
        AssociatedObject.PreviewMouseLeftButtonDown += (s, e) =>
        {
            AssociatedObject.IsChecked = !AssociatedObject.IsChecked;
            e.Handled = true;
        };
        AssociatedObject.MouseEnter += (s, e) =>
        {
            mouseOver = true;
            clicked = false;
        };
        AssociatedObject.MouseLeave += (s, e) =>
        {
            mouseOver = false;
        };
        AssociatedObject.MouseMove += (s, e) =>
        {
            if (mouseOver && !clicked && e.LeftButton == MouseButtonState.Pressed)
            {
                AssociatedObject.IsChecked = !AssociatedObject.IsChecked;
                clicked = true;
            }
        };
    }
}

Answer 2

问题是,<代码>ToggleButton的缺省行为是,在左 mo子被点击时,捕获 mo。由于烟雾被抓获,所有烟.事件都发到第一部<条码>上。

与你想要做的一样,是推翻这种缺席行为,这样,人们就会被夺走,但坦率地说,我无法真正地遵循你想要达到的目标。

Answer 3

我对正常的<代码>Buttons也有同样的问题。对我来说,解决办法是将<代码>e.Handled = 真正的列入。 PreviewMouse Button Down活动(我也实施了这一活动)。看来,仅仅通过 mo的下浮标,以前的行动直到烟 but释放为止,还没有得到充分处理,因此,<代码>MouseEnter事件无法提出。

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