我试图让我的用户交换两个 DevExpress 图表控件（尽管我相信几乎任何控件都应该工作......），方法是将一个拖到另一个之上。我已经为我的 TabControl 完成了此操作（以允许交换/移动选项卡），但由于某种原因，我似乎在这里遗漏了一些东西，这阻止了我对 ChartControl 做同样的事情。
它“应该”在图表控件上绘制一个灰色框，并允许用户将其拖动到他们喜欢的任何地方，但我只是得到一个带有条纹的黑色圆圈。
这是我到目前为止编写的代码，希望你们中的一个人能够发现错误，我可以停止拉扯我的头发！:)
private void ChartControlMouseMove(object sender, MouseEventArgs e)
{
// Handle Mouse move only if left button is pressed.
if (e.Button == MouseButtons.Left)
{
var chartControl = (ChartControl)sender;
// If the mouse moves outside the rectangle, start the drag.
if (!rectDragBoxFromMouseDown.Equals(Rectangle.Empty)
& !rectDragBoxFromMouseDown.Contains(e.X, e.Y))
{
Invalidate();
DoDragDrop(chartControl, DragDropEffects.Move);
CalcRectDragBox(e.X, e.Y);
Invalidate();
}
}
}
private void ChartControlMouseDown(object sender, MouseEventArgs e)
{
CalcRectDragBox(e.X, e.Y);
}
private void CalcRectDragBox(int x, int y)
{
// Remember the point where the mouse down occurred. The DragSize indicates
// the size that the mouse can move before a drag event should be started.
var dragSize = SystemInformation.DragSize;
// Create a rectangle using the DragSize, with the mouse position being
// at the center of the rectangle.
rectDragBoxFromMouseDown = new Rectangle(
new Point(x - (dragSize.Width/2), y - (dragSize.Height/2)), dragSize);
}
private void ChartControlDragOver(object sender, DragEventArgs e)
{
var chartControl = (ChartControl)sender;
// get the control we are hovering over.
var hitInformation = chartControl.CalcHitInfo(chartControl.PointToClient(new Point(e.X, e.Y)));
if ((hitInformation != null))
{
//ChartHitInfo hoverTab = hitInformation;
if (e.Data.GetDataPresent(typeof(ChartControl)))
{
e.Effect = DragDropEffects.Move;
var dragTab = (ChartControl)e.Data.GetData(typeof(ChartControl));
if (dragTab != chartControl)
{
for (int i = 0; i < layoutControlGroupDashboard.Items.Count; i++)
{
var layoutControlItem = layoutControlGroupDashboard.Items[i] as LayoutControlItem;
if (layoutControlItem != null && layoutControlItem.Control == chartControl)
{
for (int j = 0; j < layoutControlGroupDashboard.Items.Count; j++)
{
var controlItem = layoutControlGroupDashboard.Items[j] as LayoutControlItem;
if (controlItem != null && controlItem.Control == dragTab)
{
if (!_ignoreNextDrag)
{
_ignoreNextDrag = true;
layoutControlGroupDashboard.BeginInit();
var layoutControlItemi = layoutControlGroupDashboard.Items[i] as LayoutControlItem;
if (layoutControlItemi != null)
{
Control tempControlI =
layoutControlItemi.Control;
var layoutControlItemj = layoutControlGroupDashboard.Items[j] as LayoutControlItem;
if (layoutControlItemj != null)
{
layoutControlItemi.BeginInit();
layoutControlItemj.BeginInit();
Control tempControlJ =
layoutControlItemj.Control;
layoutControlItemi.Control =
null;
layoutControlItemj.Control =
null;
layoutControlItemi.Control =
tempControlJ;
layoutControlItemj.Control =
tempControlI;
layoutControlItemi.EndInit();
layoutControlItemj.EndInit();
}
}
layoutControlGroupDashboard.EndInit();
break;
}
else
{
_ignoreNextDrag = false;
break;
}
}
}
}
}
}
}
}
else
{
e.Effect = DragDropEffects.None;
}
}
同样，这个想法是允许用户交换控件只需单击单击拖动周围的东西......希望这只是我错过的一些简单的东西，但我一辈子都看不到它！
编辑：这是我尝试过的（首先将我的图表添加到面板......）
Panel panel = new Panel();
panel.Name = Guid.NewGuid().ToString();
panel.Controls.Add(chartControl);
var dashboardItem = new LayoutControlItem(layoutControlDashboard, panel)
{
Padding = new DevExpress.XtraLayout.Utils.Padding(0),
Spacing = new DevExpress.XtraLayout.Utils.Padding(0),
SizeConstraintsType = SizeConstraintsType.Custom
};