Question

我正在学习C＃并选择了一个项目来编写一个简单的颜色选择器控件;但是，自从我上次编写代码以来，事情发生了很大变化，我已经解决了这个问题。

我在我的控制中使用Mousedown事件将鼠标坐标作为Point - 这工作正常并且返回我期望的 - 鼠标坐标相对于我的控件;然而，当我尝试对控制位置进行检查时，我返回一个值作为Point，显示我的控件相对于窗体的位置，在某些情况下鼠标坐标将超出边界，因为它们的值将小于控件IE的相对起始位置我在控件中的像素1,1处单击 - 鼠标位置为1,1但由于控件位于相对于表格的9,9，因此鼠标的位置小于边界控制 - 我完全不知道如何解决这个问题，我一直试图用PointToClient和PointToScreen来解决它无济于事，因为他们似乎想出了古怪的价值观，有人可以帮助我，这让我疯了。

Answer 1

我已经设法解决了这个问题，所以我想我会发布答案，它可以帮助别人。我在获取相对于相同像素原点的Point值时遇到了问题：这对它进行了排序。

 private void ColourPicker_MouseDown(object sender, MouseEventArgs e)
 {   // Probably being paranoid but I am worried about scaling issues, this.Location
     // would return the same result as this mess but may not handle
     // scaling <I haven't checked>
     Point ControlCoord = this.PointToClient(this.PointToScreen(this.Location));
     int ControlXStartPosition = ControlCoord.X;
     int ControlYStartPosition = ControlCoord.Y;
     int ControlXCalculatedWidth = ((RectangleColumnsCount + 1) * WidthPerBlock ) + ControlXStartPosition;
     int ControlYCalculatedHeight = ((RectangleRowsCount   + 1) * HeightPerBlock) + ControlYStartPosition;

     // Ensure that the mouse coordinates are comparible to the control coordinates for boundry checks.
     Point ControlRelitiveMouseCoord  = this.ParentForm.PointToClient(this.PointToScreen(e.Location));
     int ControlRelitiveMouseXcoord = ControlRelitiveMouseCoord.X;
     int ControlRelitiveMouseYcoord = ControlRelitiveMouseCoord.Y;

     // Zero Relitive coordinates are used for caluculating the selected block location
     int ZeroRelitiveXMouseCoord = e.X;
     int ZeroRelitiveYMouseCoord = e.Y;

     // Ensure we are in the CALCULATED boundries of the control as the control maybe bigger than the painted area on
     // the design time form and we don't want to use unpaited area in our calculations.
     if((ControlRelitiveMouseXcoord > ControlXStartPosition) && (ControlRelitiveMouseXcoord < ControlXCalculatedWidth))
     {
        if((ControlRelitiveMouseYcoord > ControlYStartPosition) && (ControlRelitiveMouseYcoord < ControlYCalculatedHeight))
        {
            SetEvaluatedColourFromPosition(ZeroRelitiveXMouseCoord, ZeroRelitiveYMouseCoord);
        }
     }
  }

如何正确获取相对于控件的控制边界坐标以进行鼠标比较？

1 个答案: