移动多个控件 [英] moving multiple controls

问题描述

我需要使用鼠标光标移动多个文本框。
我决定我这样做。
如果单击文本框（并按下控制按钮），则文本框将添加到所选项目列表中。然后，当仍然按下按钮并且鼠标移动时，我执行移动控件的操作。但是，我的代码无法正常运行。文本框正在移动，但是非常快。这是我的代码

I need to move a multiple textboxes with a mouse cursor. I decided that I do it that way. If a textbox is clicked (and Control button is pressed) textbox is added to list of selected items. Then when button is still pressed and when mouse moves I do an operation of moving controls. However my code doesn't work well. Textboxes are moving but very very fast. Here is my code

 List<TextBox> items;
 private void txtBox_PreviewMouseDown(object sender, RoutedEventArgs e)
    {


            isClicked = true;
            startPoint = Mouse.GetPosition(  (sender as TextBox).Parent);
            items = CurrentSelection;




    }
private void txtBox_PreviewMouseMove(object sender, RoutedEventArgs e)
    {


        Point mousePos = Mouse.GetPosition(parentCanvas);
         if (isClicked)
         {
             foreach (TextBox item in items)
             {
                 double left = Canvas.GetLeft(item);
                 double top = Canvas.GetTop(item);

                 Canvas.SetLeft(item, left + (startPoint.X - mousePos.X));
                 Canvas.SetTop(item, top + (startPoint.Y - mousePos.Y));
             }
         }

    }

基本上我遍历所有选定项并更改其在画布上的位置。但是，我可能以错误的方式计算了新头寸。

Basically I iterate through all selected items and change their position on canvas. However I probably calculate a new position in a wrong way.

推荐答案

问题是，您总是计算初始值的增量起点。您必须在每次调用txtBox _ PreviewMouseMove 之后实现startPoint。像这样的东西...

The problem is, that you always calculate the delta to the initial start point. You must actualize startPoint after every call to txtBox_PreviewMouseMove. Somethin like...

private void txtBox_PreviewMouseMove(object sender, RoutedEventArgs e) {  
    Point mousePos = Mouse.GetPosition(parentCanvas); 
     if (isClicked){ 
         foreach (TextBox item in items) { 
             double left = Canvas.GetLeft(item); 
             double top = Canvas.GetTop(item); 

             Canvas.SetLeft(item, left + (startPoint.X - mousePos.X)); 
             Canvas.SetTop(item, top + (startPoint.Y - mousePos.Y)); 
         } 
         startPoint=mousePoint;
     } 

} 

...应该做这份工作。我看到的另一件事是，方向可能是相反的。这可以很容易地纠正。将计算更改为...

...should do the job. Another thing I have seen, is that the direction is probably inverted. This can be easily corrected. Change the calculcation to...

Canvas.SetLeft(item, left + (mousePos.X-startPoint.X ));  
Canvas.SetTop(item, top + (mousePos.Y-startPoint.Y));  

...而且这个问题也应该消失。

... and this problem should also be gone.

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