如何在Windows中最大化的窗口上无缝调用MoveWindow？

Question

I have a C# application that is attempting to create a customizable version of Windows's Snap functionality. I primarily use the native functions MoveWindow and ShowWindowAsync . I also use GetWindowPlacement to determine maximized/normal/minimized state.

I can seamlessly snap a "normal" window around to my user definable frames. The window instantly snaps to new desired position and size.

The problem is when I transition from maximized to normal. If I only call MoveWindow then the window snaps to my desired position and size. However the window still thinks it's "maximized" which causes attempts to re-maximize to fail.

However if I call ShowWindowAsync(wnd, SW_SHOWNORMAL) followed by MoveWindow(wnd, x, y, width, height, true) it causes the maximized window to animate to it's old position then snap to its new position. This is very jarring and unpleasant. Attempting to flip the call order or use ShowWindow instead of ShowWindowAsync does not help.

The answer to this question might be to disable the animation. I have not found a clean way to do that.

Answer 1

Solution found!

The fix is to call SetWindowPlacement instead of MoveWindow . SetWindowPlacement takes a WINDOWPLACEMENT structure which allows setting both position/size and showCmd state at the same time.