问题描述
使用Popup控件作为弹出框,使用相对位置弹出即Placement=“Relative”,在不同的设备中弹出的位置不一致。比如下面的例子。
使用如下代码:
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< Window x:Class = "WpfApp1.MainWindow" xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d = "http://schemas.microsoft.com/expression/blend/2008" xmlns:mc = "http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local = "clr-namespace:WpfApp1" mc:Ignorable = "d" Title = "MainWindow" Height = "360" Width = "640" > < Grid > < ToggleButton x:Name = "Btn_Popup" Width = "70" Height = "35" Content = "弹出" /> < Popup x:Name = "Popup1" Placement = "Relative" AllowsTransparency = "True" PlacementTarget = "{Binding ElementName=Btn_Popup}" IsOpen = "{Binding IsChecked, ElementName=Btn_Popup}" StaysOpen = "False" Width = "120" Height = "120" HorizontalOffset = "80" VerticalOffset = "-125" > < Grid > < Border Width = "120" Height = "60" BorderBrush = "#333333" BorderThickness = "1" CornerRadius = "10" Background = "White" > < TextBlock Text = "弹出框" FontSize = "16" HorizontalAlignment = "Center" VerticalAlignment = "Center" /> </ Border > </ Grid > </ Popup > </ Grid > </ Window > |
显示效果:
原因分析
出现这样的情况,主要原因是Windows的系统设置不同导致的问题。弹出框会根据系统的菜单位置设置的不同弹出的参考点会相应改变。
查看设置的方法:
使用组合键“Win+R”,调出“运行”对话框,在文本框中输入“shell:::{80F3F1D5-FECA-45F3-BC32-752C152E456E}”
打开后选择其他。发现大部分系统默认为左手打开。但是当有些系统被人为的设置为右手打开时,Popup的弹出位置就异常了。
解决方法
方法一、 修改系统配置
(1)手动修改
参考上面
(2)通过Win32 Api修改
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[DllImport( "user32.dll" , EntryPoint = "SystemParametersInfo" , SetLastError = true )] public static extern bool SystemParametersInfoSet( uint action, uint uiParam, uint vparam, uint init); void SetMenuAlign() { //uiParam为false时设置弹出菜单左对齐,true则右对齐 SystemParametersInfoSet(0x001C /*SPI_SETMENUDROPALIGNMENT*/ , 0, 0, 0); } |
方法二、调整代码
采用 Placement="Absolute"的方式弹出Popup即可:
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< Window x:Class = "WpfApp1.MainWindow" xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d = "http://schemas.microsoft.com/expression/blend/2008" xmlns:mc = "http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local = "clr-namespace:WpfApp1" mc:Ignorable = "d" Title = "MainWindow" Height = "360" Width = "640" > < Grid > < ToggleButton x:Name = "Btn_Popup" Width = "70" Height = "35" Content = "点击弹出" /> < Popup x:Name = "Popup1" Placement = "Absolute" AllowsTransparency = "True" PlacementTarget = "{Binding ElementName=Btn_Popup}" IsOpen = "{Binding IsChecked, ElementName=Btn_Popup}" StaysOpen = "False" Width = "120" Height = "120" HorizontalOffset = "80" VerticalOffset = "-100" Opened = "Popup1_Opened" > < Grid > < Border Width = "120" Height = "60" BorderBrush = "#333333" BorderThickness = "1" CornerRadius = "10" Background = "White" > < TextBlock Text = "弹出框" FontSize = "16" HorizontalAlignment = "Center" VerticalAlignment = "Center" /> </ Border > </ Grid > </ Popup > </ Grid > </ Window > |
在cs中计算相对位置:
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private void Popup1_Opened( object sender, EventArgs e) { Popup pop = sender as Popup; if (pop == null ) return ; if (pop.PlacementTarget == null ) return ; if (pop.Placement == PlacementMode.Absolute) { var relative = pop.PlacementTarget.PointToScreen( new Point(0, 0)); pop.HorizontalOffset = relative.X + 80; pop.VerticalOffset = relative.Y + -100; } } |
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原文链接:https://blog.csdn.net/u013113678/article/details/120696007