弹出窗口的默认行为是,如果它被放置在超出屏幕边缘的位置,弹出窗口将重新定位。有没有一种方法可以关闭这种行为?
我有一个弹出窗口,用户可以在屏幕上拖动它。然而,当它到达边缘时就会卡住。它会卡在边缘处,并保持在那里,直到鼠标被远离边缘拖动。此外,我有两个显示器,当弹出窗口被拖到两个显示器共享的边缘时,我会看到闪烁。弹出窗口在两个显示器之间闪烁。
只需使用interop来移动弹出窗口(拖动它们)
这里是Thumb的代码,它将跟踪拖动过程
private Thumb mThumb = null;
public Thumb Thumb
{
get { return mThumb; }
set
{
if (mThumb != value)
{
if (mThumb != null)
{
DetachThumb();
}
mThumb = value;
if (mThumb != null)
{
AttachThumb();
}
}
}
}
private void AttachThumb()
{
Thumb.DragStarted += Thumb_DragStarted;
Thumb.DragDelta += Thumb_DragDelta;
Thumb.DragCompleted += Thumb_DragCompleted;
}
private void DetachThumb()
{
Thumb.DragStarted -= Thumb_DragStarted;
Thumb.DragDelta -= Thumb_DragDelta;
Thumb.DragCompleted -= Thumb_DragCompleted;
}
private void Thumb_DragStarted(object sender, DragStartedEventArgs e)
{
mIsThumbDragging = true;
mPreviousDiffX = 0;
mPreviousDiffY = 0;
}
private void Thumb_DragDelta(object sender, DragDeltaEventArgs e)
{
if (mIsMoving)
{
return;
}
mIsMoving = true;
try
{
if (mIsThumbDragging)
{
var doubleDetaX = e.HorizontalChange + mPreviousDiffX;
var doubleDetaY = e.VerticalChange + mPreviousDiffY;
var deltaX = (int)doubleDetaX;
var deltaY = (int)doubleDetaY;
mPreviousDiffX = (double)deltaX - doubleDetaX;
mPreviousDiffY = (double)deltaY - doubleDetaY;
HostPopup.Move(deltaX, deltaY);
}
}
finally
{
mIsMoving = false;
}
}
private void Thumb_DragCompleted(object sender, DragCompletedEventArgs e)
{
mIsThumbDragging = false;
}
#endregion
HostPopup类是Popup的子类,它使用Interop具有以下方法来移动窗口:
[DllImport("user32.dll", SetLastError = true)]
internal static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
internal void Move(int deltaX, int deltaY)
{
if (mIsMoving)
{
return;
}
mIsMoving = true;
try
{
if (Child == null)
return;
var hwndSource = (PresentationSource.FromVisual(Child)) as HwndSource;
if (hwndSource == null)
return;
var hwnd = hwndSource.Handle;
RECT rect;
if (!GetWindowRect(hwnd, out rect))
return;
MoveWindow(hwnd, rect.Left + deltaX, rect.Top + deltaY, (int)Width, (int)Height, true);
}
finally
{
mIsMoving = false;
}
}