Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Transparent Window for Unity
///
/// Copyright (c) 2019 wakagomo
///
/// This source code is released under the MIT License.
/// http://opensource.org/licenses/mit-license.php
///
using UnityEngine;
using System;
using System.Runtime.InteropServices;
/// <summary>
/// Make the window transparent.
/// </summary>
public class TransparentWindow : MonoBehaviour
{
#if !UNITY_EDITOR && UNITY_STANDALONE_WIN
#region WINDOWS API
/// <summary>
/// Returned by the GetThemeMargins function to define the margins of windows that have visual styles applied.
/// </summary>
/// https://docs.microsoft.com/en-us/windows/desktop/api/uxtheme/ns-uxtheme-_margins
private struct MARGINS
{
public int cxLeftWidth;
public int cxRightWidth;
public int cyTopHeight;
public int cyBottomHeight;
}
/// <summary>
/// Retrieves the window handle to the active window attached to the calling thread's message queue.
/// </summary>
/// https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-getactivewindow
[DllImport("User32.dll")]
private static extern IntPtr GetActiveWindow();
/// <summary>
/// Changes an attribute of the specified window. The function also sets the 32-bit (long) value at the specified offset into the extra window memory.
/// </summary>
/// https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-setwindowlonga
[DllImport("User32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, uint dwNewLong);
/// <summary>
/// Changes the size, position, and Z order of a child, pop-up, or top-level window. These windows are ordered according to their appearance on the screen. The topmost window receives the highest rank and is the first window in the Z order.
/// </summary>
/// https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-setwindowpos
[DllImport("User32.dll")]
private static extern int SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
/// <summary>
/// Extends the window frame into the client area.
/// </summary>
/// https://docs.microsoft.com/en-us/windows/desktop/api/dwmapi/nf-dwmapi-dwmextendframeintoclientarea
[DllImport("Dwmapi.dll")]
private static extern uint DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);
#endregion
private void Awake()
{
IntPtr windowHandle = GetActiveWindow();
{ // SetWindowLong
const int GWL_STYLE = -16;
const int GWL_EXSTYLE = -20;
const uint WS_POPUP = 0x80000000;
const uint WS_EX_LAYERD = 0x080000;
const uint WS_EX_TRANSPARENT = 0x00000020;
SetWindowLong(windowHandle, GWL_STYLE, WS_POPUP);
SetWindowLong(windowHandle, GWL_EXSTYLE, WS_EX_LAYERD | WS_EX_TRANSPARENT);
}
{ // SetWindowPos
IntPtr HWND_TOPMOST = new IntPtr(-1);
const uint SWP_NOSIZE = 0x0001;
const uint SWP_NOMOVE = 0x0002;
const uint SWP_NOACTIVE = 0x0010;
const uint SWP_SHOWWINDOW = 0x0040;
SetWindowPos(windowHandle, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVE | SWP_SHOWWINDOW);
}
{ // DwmExtendFrameIntoClientArea
MARGINS margins = new MARGINS()
{
cxLeftWidth = -1
};
DwmExtendFrameIntoClientArea(windowHandle, ref margins);
}
}
#endif // !UNITY_EDITOR && UNITY_STANDALONE_WIN
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.