如下所示,我有一个弹出窗口,我想用右下角的拇指调整它的大小。拇指有一个附加行为,我想调整大小。
<Popup x:Name="Popbox" Placement="Mouse" StaysOpen="False" Width="50" Height="50" >
<Grid>
<Border Background="AliceBlue"/>
<Thumb HorizontalAlignment="Right"
VerticalAlignment="Bottom"
Width="16" Height="16" >
<i:Interaction.Behaviors>
<helpers:PopupResizeBehaviors PopupObject="{Binding ElementName=Popbox}"/>
</i:Interaction.Behaviors>
</Thumb>
</Grid>
</Popup>
class PopupResizeBehaviors : Behavior<Thumb>
{
private bool mouseDown;
private Point oldMousePosition;
protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.PreviewMouseLeftButtonDown += (s, e) =>
{
mouseDown = true;
};
AssociatedObject.DragDelta += (s, e) =>
{
if (!mouseDown) return;
double tempWidth = 0;
double tempHeight = 0;
PopupObject.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
tempWidth = PopupObject.DesiredSize.Width;
tempHeight = PopupObject.DesiredSize.Height;
double yadjust = tempHeight + e.VerticalChange;
double xadjust = tempWidth + e.HorizontalChange;
PopupObject.Width = xadjust;
PopupObject.Height = yadjust;
};
AssociatedObject.PreviewMouseLeftButtonUp += (s, e) =>
{
mouseDown = false;
};
}
protected override void OnDetaching()
{
base.OnDetaching();
}
public static readonly DependencyProperty PopupObjectProperty =
DependencyProperty.RegisterAttached("PopupObject", typeof(Popup), typeof(PopupResizeBehaviors), new UIPropertyMetadata(null));
public Popup PopupObject
{
get { return (Popup)GetValue(PopupObjectProperty); }
set { SetValue(PopupObjectProperty, value); }
}
}
它目前无法正常工作,但应该可以很好地了解我的目标。
如何让这种行为发挥作用?
最佳答案
这是我最后用的。
class PopupResizeBehaviors : Behavior<Thumb>
{
private const int MaxSize = 500;
private const int MinSize = 50;
protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.DragDelta += (s, e) =>
{
Thumb t = s as Thumb;
if (t.Cursor == Cursors.SizeWE || t.Cursor == Cursors.SizeNWSE)
{
PopupObject.Width = Math.Min(MaxSize,
Math.Max(PopupObject.Width + e.HorizontalChange,
MinSize));
}
if (t.Cursor == Cursors.SizeNS || t.Cursor == Cursors.SizeNWSE)
{
PopupObject.Height = Math.Min(MaxSize,
Math.Max(PopupObject.Height + e.VerticalChange,
MinSize));
}
};
}
protected override void OnDetaching()
{
base.OnDetaching();
}
public static readonly DependencyProperty PopupObjectProperty =
DependencyProperty.RegisterAttached("PopupObject", typeof(Popup), typeof(PopupResizeBehaviors), new UIPropertyMetadata(null));
public Popup PopupObject
{
get { return (Popup)GetValue(PopupObjectProperty); }
set { SetValue(PopupObjectProperty, value); }
}
}
关于c# - 通过具有附加行为的 Thumb 调整弹出窗口的大小,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28064999/