How Can I Make a Borderless Form Movable?

Create a mobile borderless window

In the graphic user interface, windows with border are common, and users can move them by dragging the borders. However, some applications may require a borderless window to achieve specific aesthetic effects or functions. But how to move these borderless windows?

Solution

A valid technique of creating a mobile borderless window is to use the Windows API function:

Define two constants:
1. means the message sent when pressing the left mouse button on the window,

   indicates that the click occurs in the title bar. WM_NCLBUTTONDOWN HT_CAPTION

Import the necessary functions:
2. Send messages to the window,

   Release the mouse capture. SendMessage ReleaseCapture

In the
3. event processing program in the window:

   MouseDown

   Check whether to press the left mouse button.
   • If so, release the mouse capture and use
   to send messages to the window, and set the
   • to WM_NCLBUTTONDOWN. wParam HT_CAPTION
This code actually simulates the operation of clicking on the mouse on the title bar, allowing the window as usual.

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