C＃拖放內帆布

多張圖片我有下面的代碼來拖拽圖片我的畫布裏面：C＃拖放內帆布

img.AllowDrop = true; 
img.PreviewMouseLeftButtonDown += this.MouseLeftButtonDown; 
img.PreviewMouseMove += this.MouseMove; 
img.PreviewMouseLeftButtonUp += this.PreviewMouseLeftButtonUp; 


private object movingObject; 
private double firstXPos, firstYPos; 
private void MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { 
    // In this event, we get the current mouse position on the control to use it in the MouseMove event. 
    Image img = sender as Image; 
    Canvas canvas = img.Parent as Canvas; 

    firstXPos = e.GetPosition(img).X; 
    firstYPos = e.GetPosition(img).Y; 

    movingObject = sender; 

    // Put the image currently being dragged on top of the others 
    int top = Canvas.GetZIndex(img); 
    foreach (Image child in canvas.Children) 
     if (top < Canvas.GetZIndex(child)) 
      top = Canvas.GetZIndex(child); 
    Canvas.SetZIndex(img, top + 1); 
} 
private void PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e) { 
    Image img = sender as Image; 
    Canvas canvas = img.Parent as Canvas; 

    movingObject = null; 

    // Put the image currently being dragged on top of the others 
    int top = Canvas.GetZIndex(img); 
    foreach (Image child in canvas.Children) 
     if (top > Canvas.GetZIndex(child)) 
      top = Canvas.GetZIndex(child); 
    Canvas.SetZIndex(img, top + 1); 
} 
private void MouseMove(object sender, MouseEventArgs e) { 
    if (e.LeftButton == MouseButtonState.Pressed && sender == movingObject) { 
     Image img = sender as Image; 
     Canvas canvas = img.Parent as Canvas; 

     double newLeft = e.GetPosition(canvas).X - firstXPos - canvas.Margin.Left; 
     // newLeft inside canvas right-border? 
     if (newLeft > canvas.Margin.Left + canvas.ActualWidth - img.ActualWidth) 
      newLeft = canvas.Margin.Left + canvas.ActualWidth - img.ActualWidth; 
     // newLeft inside canvas left-border? 
     else if (newLeft < canvas.Margin.Left) 
      newLeft = canvas.Margin.Left; 
     img.SetValue(Canvas.LeftProperty, newLeft); 

     double newTop = e.GetPosition(canvas).Y - firstYPos - canvas.Margin.Top; 
     // newTop inside canvas bottom-border? 
     if (newTop > canvas.Margin.Top + canvas.ActualHeight - img.ActualHeight) 
      newTop = canvas.Margin.Top + canvas.ActualHeight - img.ActualHeight; 
     // newTop inside canvas top-border? 
     else if (newTop < canvas.Margin.Top) 
      newTop = canvas.Margin.Top; 
     img.SetValue(Canvas.TopProperty, newTop); 
    } 
}

此代碼讓我可以拖動和刪除畫布中的圖像，無需離開Canvas本身。

現在我只需要能夠做兩兩件事：

修正了一個小錯誤在我的形象的鼠標滑動時，我拖累他們身邊快速。這種情況經常發生，即使我甚至沒有快速移動拖動圖像。
使其能夠一次拖放多個圖像，最好先選擇多個圖像，然後拖放並拖放圖像，在帆布內停留時，將其全部放入其中。

PS：我以前的問題可以找到here。

來源

2014-02-18 Kevin Cruijssen

您需要將鼠標鎖定到圖像上以停止光標滑動Mouse.Capture（imageReference），您可以使用Mouse.Capture（null）在鼠標上釋放它（安裝） – Andy

@Andy非常感謝，這解決了我的問題！在下面添加它作爲答案。 –

您需要將鼠標鎖定到圖像上以停止光標滑動Mouse.Capture（imageReference），您可以通過Mouse.Capture（null）在鼠標上釋放它 - Andy Feb 18在15:58

後使用Andy的建議，通過添加：

Mouse.Capture(img);

在的MouseLeftButtonDown函數的底部，並

Mouse.Capture(null);

位於PreviewMouseLeftButtonUp函數的底部，它的工作原理類似於魅力。 非常感謝Andy！

來源

2014-02-22 15:30:29

C＃拖放內帆布

回答

相關問題