How Can I Move a Borderless Windows Forms Application?

Move the sideless window

In the Windows window application, users often need to create a borderless window to obtain a more seamless or immersive experience. However, lack of borders will bring challenges when trying to move these windows.

In order to solve this problem, a very effective way is to operate Windows messages to simulate the behavior of band -band windows. This technology has a detailed introduction on CODEPROJECT, including the following steps:

Define Windows message constant:
1. Define the constant of related Windows messages (WM_NCLBUTTONDON) and handle types (HT_CAPTION).
   Import DLL function:
Introduce Sendmessage and the ReleaseCapture function from User32.dll.

2. Press the incident:

   In the Mousedown event of the window, check whether the left mouse button is clicked. If it is:

3. Call the releasecapture to release the mouse capture. Send a message to the window handle to simulate the title bar.

   • Through these steps, the code effectively deceived the window manager so that it believes that the cursor is interacting with the title bar, even if the window does not have a title bar. Therefore, users can move the borderless window like a bezel window.

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