// 鼠标按钮按下选中文本
private void mouseDownSelectText()
{
if (MouseButtons.Left.Equals(MouseDownButton)) // 点击的左键
{
Point p = MouseDownLocation;
if (p.X < 0)
{
p.X = 0;
}
if (p.Y < 0)
{
p.Y = 0;
}
int mouseIndex = this.GetCharIndexFromPosition(p);
int selIndex = this.SelectionStart;
if (KeysDown.Equals(Keys.ShiftKey)) // 按下了shift
{
if (mouseIndex < selIndex)
{
this.SelectionStart = mouseIndex;
}
else
{
this.SelectionStart = SelectionStart;
}
this.SelectionLength = Math.Abs(mouseIndex - selIndex);
}
else
{
if (isMouseEnterSelectText(p) /*|| SelectionLength == 0*/)
{
ControlsUtils.AsynchronousMethod(this, 120, new EventHandler((object sender1, EventArgs e1) => {
if (!Cursor.Equals(selectTextDragCur) && MouseDownButton.Equals(MouseButtons.None))
{
SelectionLength = 0;
SelectionStart = mouseIndex;
}
}));
}
else
{
SelectionLength = 0;
SelectionStart = mouseIndex;
}
}
}
}
// 开启或关闭鼠标选中文本的拖放
private void diIsSelectTextDrag()
{
// 判断是否要启用拖放操作
ControlsUtils.AsynchronousMethod(this, 100, new EventHandler((object sender1, EventArgs e1) => {
Point p = MouseDownLocation;
if (p.X < 0)
{
p.X = 0;
}
if (p.Y < 0)
{
p.Y = 0;
}
if (MouseDownButton.Equals(MouseButtons.Left) && isMouseEnterSelectText(p))
{
Cursor = selectTextDragCur;
}
;
}));
}