我不知道我的代码或WPF是否有问题,但问题在于:我想创建一个小程序,在画布上使用光标绘图。我有一个简单的WPF窗口:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="475" Width="544">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="100px"></RowDefinition>
<RowDefinition Height ="*"></RowDefinition>
<RowDefinition Height="100px"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100px"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="100px"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Canvas Grid.Row="1" Grid.Column="1" Name="imageCanvas" MouseEnter="StackPanel_MouseEnter" MouseLeave="StackPanel_MouseLeave" Background="LightGray"
MouseDown="StackPan_MouseDown" MouseUp="StackPan_MouseUp" MouseMove="StackPan_MouseMove">
</Canvas>
</Grid>
这里是背景代码:
private void StackPan_MouseDown(object sender, MouseButtonEventArgs e)
{
draw = true;
}
private void StackPan_MouseUp(object sender, MouseButtonEventArgs e)
{
draw = false;
}
private void StackPan_MouseMove(object sender, MouseEventArgs e)
{
if (draw)
{
var pos = Mouse.GetPosition(imageCanvas);
Rectangle rec = new Rectangle()
{
Width = 10,
Height = 10,
Fill = Brushes.Red,
};
Canvas.SetTop(rec, pos.Y);
Canvas.SetLeft(rec, pos.X);
imageCanvas.Children.Add(rec);
}
}
我的工作是以下内容: https://www.dropbox.com/s/7moq4p8f8f409b3/wpf_canvas.png
当光标在画布之外时,为什么会调用StackPan_MouseMove函数?
这里有一个可执行文件,你可以注意到这种行为: https://www.dropbox.com/s/ye1w2j9chld2oif/WpfApplication1.exe