爲什麼我的Canvas上的MouseLeftButtonUp不會在我的WPF應用程序中激活? 這裏是XAML:爲什麼不在WPF中觸發MouseLeftButtonUp?
<Grid Height="300" Width="400">
<Canvas Name="canvas" MouseMove="canvas_MouseMove" MouseLeftButtonUp="canvas_MouseLeftButtonUp" Background="LightGray"/>
</Grid>
,代碼:
private bool hasClicked = false;
public Window1()
{
InitializeComponent();
}
private void canvas_MouseMove(object sender, MouseEventArgs e)
{
if (!this.hasClicked)
{
this.Cursor = Cursors.None;
this.canvas.Children.Clear();
this.insertRectangle(false);
}
}
private void insertRectangle(bool filled)
{
Rectangle rect = createRect(filled);
Point pos = Mouse.GetPosition(this.canvas);
Canvas.SetLeft(rect, pos.X);
Canvas.SetTop(rect, pos.Y);
this.canvas.Children.Add(rect);
}
private Rectangle createRect(bool fill)
{
Rectangle rect = new Rectangle();
rect.Height = 50;
rect.Width = 120;
if (fill)
{
rect.Fill = new SolidColorBrush(Colors.Green);
}
else
{
rect.Stroke = new SolidColorBrush(Colors.Green);
}
return rect;
}
private void canvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
this.hasClicked = true;
this.insertRectangle(true);
this.Cursor = Cursors.Arrow;
}
編輯:我曾嘗試添加背景色設爲畫布,但仍事件不會觸發。看起來MouseMove以某種方式覆蓋了MouseLeftButtonUp。
Edit2:如果我刪除MouseMove事件,mouseLeftButtonUp將會觸發。
Edit3:更大的代碼示例。 在insertRectangle方法,如果我用
Canvas.SetTop(rect, 50);
instead of
Canvas.SetTop(rect, pos.Y);
事件火災就好了。
你的代碼對我來說不是問題。這兩起事件都被解僱了。 –