如何解决当我在C#中使用inkcanvas1.Strokes.Erase语句时,WPF-InkCanvas StrokeErased事件未触发
当我使用inkcanvas1.EditingMode为InkCanvasEditingMode.EraseByPoint时,它正在擦除并且还触发了strokeErased事件。
但是当我通过inkcanvas1.strokes.Erase()擦除笔划时函数,则不会触发strokeErased事件。
然后如何识别删除的笔画和新创建的笔画。
考虑在我的画布上笔触数以千计。
所以我无法保持所有添加和删除的笔画。
还有其他事件或解决方案吗?
<Window x:Class="Mywhiteboard.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:Mywhiteboard"
mc:Ignorable="d"
WindowState="Maximized"
Title="MainWindow" >
<Grid>
<Grid.RowDeFinitions>
<RowDeFinition Height="*"></RowDeFinition>
<RowDeFinition Height="auto"></RowDeFinition>
</Grid.RowDeFinitions>
<InkCanvas x:Name="inkcanvas1" Grid.Row="0" strokeErased="inkcanvas1_strokeErased" MouseMove="inkcanvas1_MouseMove"></InkCanvas>
<StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Center">
<Button Width="100" Height="50" Background="WhiteSmoke" Content="Draw" Click="drawInkClick"></Button>
<Button Width="100" Height="50" Background="WhiteSmoke" Content="Erase by Point" Click="EraseByPointsClick"></Button>
<Button Width="100" Height="50" Background="WhiteSmoke" Content="stroke Erase" Click="strokeEraseClick"></Button>
<Button Width="100" Height="50" Background="WhiteSmoke" Content="clear all" Click="clearallClick"></Button>
</StackPanel>
</Grid>
</Window>
public partial class MainWindow : Window
{
private bool IsstrokeEraseCalled = false;
public MainWindow()
{
InitializeComponent();
}
private void inkcanvas1_strokeErased(object sender,RoutedEventArgs e)
{
// why this event is not calling when I use
//inkcanvas1.strokes.Erase
}
private void EraseByPointsClick(object sender,RoutedEventArgs e)
{
inkcanvas1.EditingMode = InkCanvasEditingMode.EraseByPoint;
}
private void strokeEraseClick(object sender,RoutedEventArgs e)
{
inkcanvas1.EditingMode = InkCanvasEditingMode.Select;
IsstrokeEraseCalled = !IsstrokeEraseCalled;
}
private void clearallClick(object sender,RoutedEventArgs e)
{
inkcanvas1.strokes.Clear();
}
private void inkcanvas1_MouseMove(object sender,MouseEventArgs e)
{
if (IsstrokeEraseCalled)
{
Point currentPoint = e.GetPosition((IInputElement)sender);
List<Point> enumrator = new List<Point>();
enumrator.Add(new Point(currentPoint.X,currentPoint.Y));
StylusShape EraseShape = (StylusShape)new RectangleStylusShape(100,100,0);
inkcanvas1.strokes.Erase(enumrator,EraseShape);
}
}
private void drawInkClick(object sender,RoutedEventArgs e)
{
inkcanvas1.EditingMode = InkCanvasEditingMode.Ink;
}
}
解决方法
尝试一下
web.config
,
- 通过
inkcanvas1.Strokes.Erase();
功能擦除笔划时,默认情况下不会触发 StrokeErased事件。 - 如果要保持添加和删除的笔划,则可以在
inkcanvas1.Strokes.StrokesChanged
事件中处理它。 - 或者您应该处于EraseByPoint模式并使用语句
inkcanvas1.EraserShape = new RectangleStylusShape(100,100);
- 如果您的墨水画布上有大量笔触,那么每次维护每个笔划时都很沉重,那么您可以选择使用ProperyData属性为每个笔划添加唯一的ID。
用以下代码替换您的StrokeEraseClick事件:
private void StrokeEraseClick(object sender,RoutedEventArgs e)
{
inkcanvas1.EditingMode = InkCanvasEditingMode.EraseByPoint;
inkcanvas1.EraserShape = new RectangleStylusShape(100,100);
var editMode = inkcanvas1.EditingMode;
inkcanvas1.EditingMode = InkCanvasEditingMode.None;
inkcanvas1.EditingMode = editMode;
}
它将当前模式保留为InkCanvasEditingMode.EraseByPoint,并允许您擦除定义的区域笔画。每当您使用此方法擦除笔划时,都会触发StrokeErased事件。
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