我想有在ComboBox可编辑和下拉保持打开状态。
I want to have the Combobox editable and with the dropdown stays open.
目前,这些属性被设置:
At the moment with these properties been set:
IsEditable="True" IsDropDownOpen="True" StaysOpenOnEdit="True"
只要在输入文本框或聚焦用户点击更改为其他控件,dorpdown关闭。所以,我更新的模板(包含在 WPF主题:BureauBlue )有弹出
ISOPEN =真正的
在这种特殊情况下,使下拉菜单保持打开状态,但现在当用户拖动和放大器;移动窗口的位置,下拉会的不可以自动更新其位置和留在老位置上。
Whenever the user click on the input textbox or the focus is changed to other controls, the dorpdown closes. So I updated the template (the one included in WPF Theme: BureauBlue) to have the Popup
IsOpen="true"
in this particular case that makes the dropdown stays open, but now when user drag&move the window's position, the dropdown will not update its position automatically and stay in the old position.
我怎样才能让处于打开状态时,它会自动更新它的位置
您可以使用这里描述的伎俩:http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/27950e73-0007-4e0b-9f00-568d2db1d979
You can use the trick described here: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/27950e73-0007-4e0b-9f00-568d2db1d979
我创建了一个混合行为,可以很容易与任何弹出使用方法:
I created a Blend behavior that makes it easy to use with any popup:
/// <summary>
/// A behavior that forces the associated popup to update its position when the <see cref="Popup.PlacementTarget"/>
/// location has changed.
/// </summary>
public class AutoRepositionPopupBehavior : Behavior<Popup> {
public Point StartPoint = new Point(0, 0);
public Point EndPoint = new Point(0, 0);
protected override void OnAttached() {
base.OnAttached();
if (AssociatedObject.PlacementTarget != null) {
AssociatedObject.PlacementTarget.LayoutUpdated += OnPopupTargetLayoutUpdated;
}
}
void OnPopupTargetLayoutUpdated(object sender, EventArgs e) {
if (AssociatedObject.IsOpen) {
ResetPopUp();
}
}
public void ResetPopUp() {
// The following trick that forces the popup to change it's position was taken from here:
// http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/27950e73-0007-4e0b-9f00-568d2db1d979
Random random = new Random();
AssociatedObject.PlacementRectangle = new Rect(new Point(random.NextDouble() / 1000, 0), new Size(75, 25));
}
}
下面是一个例子如何应用的行为:
Here is an example how to apply the behavior:
<Popup ...>
<i:Interaction.Behaviors>
<Behaviors:AutoRepositionPopupBehavior />
</i:Interaction.Behaviors>
</Popup>