WindowsFormHost Paint事件未触发 [英] WindowsFormHost Paint Event Not Firing
本文介绍了WindowsFormHost Paint事件未触发的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在WPF应用程序中有一个带有WindowsFormHost的面板.最终，我需要能够单击并绘制点.我让它在单独的WinForm表单中完全工作...但是由于某种原因，当调用Invalidate()时，paint事件根本不会触发！单击事件肯定会触发单击事件，因为单击时会出现消息框.即使从油漆中也看不出来.无法弄清楚为什么是我的生命……这是代码.
I have a panel withing a WindowsFormHost in a WPF app. Eventually i need to be able to click and draw points. I had it working fully in a separate WinForm form... but for some reason the paint event won't fire at all when Invalidate() is called! The click event is definitely firing as the message box comes up on the click. Not a peep out of the paint even though. Can't figure out why for the life of me... here's the code.
XML:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
Title="MainWindow" Height="1000" Width="1000"
WindowState="Maximized" SizeChanged="Window_SizeChanged" LocationChanged="Window_LocationChanged" Background="Gray">
<DockPanel LastChildFill="True">
<ToolBarTray DockPanel.Dock="Top">
<ToolBar Width="Auto" HorizontalAlignment="Stretch">
<Menu>
<MenuItem Header="File" VerticalAlignment="Center">
<MenuItem Header="New" Click="MenuItem_Click_3" />
<MenuItem Header="Open" Click="MenuItem_Click_4"/>
<MenuItem Header="Open Recent">
<MenuItem Header="Some Recent Files"/>
</MenuItem>
<MenuItem Header="Import H2OFate File" Click="MenuItem_Click_7"/>
<Separator/>
<MenuItem Header="Save" Click="MenuItem_Click_1" />
<MenuItem Header="Save As" Click="MenuItem_Click_5"/>
<MenuItem Header="Save without Results"/>
<MenuItem Header="Delete Unnecessary Files"/>
<Separator/>
<MenuItem Header="File Options"/>
<Separator/>
<MenuItem Header="Project Info"/>
<MenuItem Header="Supply Info" />
<Separator/>
<MenuItem Header="Print" Click="MenuItem_Click_6" />
<Separator/>
<MenuItem Header="Reload Current File"/>
<MenuItem Header="Exit CTRL+Q" Click="MenuItem_Click"/>
</MenuItem>
<MenuItem Header="Network Design" VerticalAlignment="Center">
<MenuItem Header="Something" Click="MenuItem_Click_8"/>
</MenuItem>
<MenuItem Header="Run Analysis" VerticalAlignment="Center">
<MenuItem Header="Run" Click="MenuItem_Click_2"/>
</MenuItem>
<MenuItem Header="View Results" VerticalAlignment="Center">
<MenuItem Header="Numeric"/>
<MenuItem Header="X-Y Plots"/>
<MenuItem Header="Contours"/>
<MenuItem Header="Reports"/>
</MenuItem>
<MenuItem Header="Facilities Management" VerticalAlignment="Center">
<MenuItem Header="Some Item"/>
<MenuItem Header="Hydraulics"/>
<MenuItem Header="Contamination"/>
<MenuItem Header="Sensor Placement"/>
</MenuItem>
<MenuItem Header="Tools/Databases" VerticalAlignment="Center">
<MenuItem Header="Some Item"/>
<MenuItem Header="Hydraulics"/>
<MenuItem Header="Contamination"/>
<MenuItem Header="Sensor Placement"/>
</MenuItem>
<MenuItem Header="Help" VerticalAlignment="Center">
<MenuItem Header="Some Item"/>
<MenuItem Header="Help"/>
<MenuItem Header="Units"/>
<MenuItem Header="Demo Examples"/>
<MenuItem Header="Tutorial"/>
<MenuItem Header="How To"/>
<MenuItem Header="About"/>
</MenuItem>
</Menu>
</ToolBar>
<ToolBar>
<Button Height="38" Width ="50" VerticalAlignment="Center" Click="Button_Click_1">
<Ellipse Width="25" Height="25" Fill="Blue" Stroke="Black" VerticalAlignment="Center"/>
</Button >
<Button Height="38" Width ="50" VerticalAlignment="Center" Click="Button_Click_1">
<Rectangle Width="38" Fill="Red" Height="7" Stroke="Black"/>
</Button >
<Button Height="38" Width ="50" VerticalAlignment="Center" Click="Button_Click_2">
<Polygon Fill="Yellow" Stroke="Black" Points="0,10 30,10 30,0 28,0 28,3 2,3 2,0 0,0" VerticalAlignment="Center"/>
</Button >
<Button Height="38" Width ="50" VerticalAlignment="Center" Click="Button_Click_3">
<Polygon Stroke="Black" Fill="Green" VerticalAlignment="Center" Points="22,0 22,7 15,7 15,15 9,15 9,7 0,7 0,0 "/>
</Button >
</ToolBar>
</ToolBarTray>
<TabControl Width ="1000" DockPanel.Dock="Left">
<TabItem Header="Map">
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
</Grid.RowDefinitions>
<WindowsFormsHost Grid.Row="0" x:Name="wfPanel" >
<WindowsFormsHost.Child>
<wf:Panel x:Name="wfSurface" MouseClick="wfSurface_MouseClick"/>
</WindowsFormsHost.Child>
</WindowsFormsHost>
</Grid>
</TabItem>
<TabItem Header="Map Settings">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="250"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Button Content="Testing 123"/>
</Grid>
</TabItem>
</TabControl>
<TabControl DockPanel.Dock="Right">
</TabControl>
</DockPanel>
C#
private void wfSurface_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g;
g = wfSurface.CreateGraphics();
epanet epa = epanet.GetInstance();
SolidBrush s = new SolidBrush(System.Drawing.Color.Blue);
g.FillEllipse(s, Convert.ToInt32(epa.xCord), Convert.ToInt32(epa.yCord), 50, 50);
g.FillEllipse(s, 400, 400, 500, 500);
MessageBox.Show("paint event fired");
}
private void wfSurface_MouseClick(object sender, System.Windows.Forms.MouseEventArgs e)
{
epanet epa = epanet.GetInstance();
epa.xCord = e.X;
epa.yCord = e.Y;
MessageBox.Show("xCord is: " + e.X.ToString());
wfSurface.Invalidate();
}
为进一步检查是否是绘画事件，我在单击事件中添加了行g.FillEllipse(s,400,400,400,400);，它成功绘制了椭圆.
And to further check that the paint event is the issue I added the line g.FillEllipse(s,400,400,400,400); into the click event and it successfully drew the ellipse.
推荐答案
WPF的人不多，但我猜想是这样添加的:
Not much of a WPF guy, but my guess would be to add this:
<WindowsFormsHost.Child>
<wf:Panel x:Name="wfSurface" Paint="wfSurface_Paint"
MouseClick="wfSurface_MouseClick"/>
</WindowsFormsHost.Child>
这篇关于WindowsFormHost Paint事件未触发的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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