Unity3D使窗口透明和点击

Question

我正在寻找一种制作 Unity3D 游戏的方法，并在我不点击某些游戏内容（如按钮或带有碰撞器的对象）时使窗口透明并点击通过

我发现了这个帖子： https://forum.unity.com/threads/solved-windows-transparent-window-with-opaque-contents-lwa_colorkey.323057/

这对我帮助很大。事实上，有一个答案可以在点击和非点击之间切换

还有我的问题。使用该脚本，当我在一个带有碰撞器的对象上时，鼠标位置在 x 轴上反转： https://i.stack.imgur.com/70CdC.gif

我尽我所能，但我不太了解 Windows api，所以我无法修复它。

谁能告诉我应该解决什么问题？

这是我正在使用的代码：

using System;
using System.Runtime.InteropServices;
using UnityEngine;

[RequireComponent (typeof (Camera))]
public class TransparentWindow : MonoBehaviour
{
[SerializeField]
private Material m_Material;

[SerializeField]
private Camera mainCamera;

private bool clickThrough = true;
private bool prevClickThrough = true;

private struct MARGINS
{
    public int cxLeftWidth;
    public int cxRightWidth;
    public int cyTopHeight;
    public int cyBottomHeight;
}

[DllImport("user32.dll")]
private static extern IntPtr GetActiveWindow();

[DllImport("user32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, uint dwNewLong);

[DllImport("user32.dll")]
static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);

[DllImport("user32.dll", EntryPoint = "SetLayeredWindowAttributes")]
static extern int SetLayeredWindowAttributes(IntPtr hwnd, int crKey, byte bAlpha, int dwFlags);

[DllImport("user32.dll", EntryPoint = "SetWindowPos")]
private static extern int SetWindowPos(IntPtr hwnd, int hwndInsertAfter, int x, int y, int cx, int cy, int uFlags);

[DllImport("Dwmapi.dll")]
private static extern uint DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS margins);

const int GWL_STYLE = -16;
const uint WS_POPUP = 0x80000000;
const uint WS_VISIBLE = 0x10000000;
const int HWND_TOPMOST = -1;

int fWidth;
int fHeight;
IntPtr hwnd;
MARGINS margins;

void Start()
{
    mainCamera = GetComponent<Camera> ();

    #if !UNITY_EDITOR // You really don't want to enable this in the editor..

    fWidth = Screen.width;
    fHeight = Screen.height;
    margins = new MARGINS() { cxLeftWidth = -1 };
    hwnd = GetActiveWindow();

    SetWindowLong(hwnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);
    SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, fWidth, fHeight, 32 | 64); //SWP_FRAMECHANGED = 0x0020 (32); //SWP_SHOWWINDOW = 0x0040 (64)
    DwmExtendFrameIntoClientArea(hwnd, ref margins);

    Application.runInBackground = true;
    #endif
}

void Update ()
{
    // If our mouse is overlapping an object
    RaycastHit hit = new RaycastHit();
    clickThrough = !Physics.Raycast (mainCamera.ScreenPointToRay (Input.mousePosition).origin,
            mainCamera.ScreenPointToRay (Input.mousePosition).direction, out hit, 100,
            Physics.DefaultRaycastLayers);

    if (clickThrough != prevClickThrough) {
        if (clickThrough) {
            #if !UNITY_EDITOR
            SetWindowLong(hwnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);
            SetWindowLong (hwnd, -20, (uint)524288 | (uint)32);//GWL_EXSTYLE=-20; WS_EX_LAYERED=524288=&h80000, WS_EX_TRANSPARENT=32=0x00000020L
            SetLayeredWindowAttributes (hwnd, 0, 255, 2);// Transparency=51=20%, LWA_ALPHA=2
            SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, fWidth, fHeight, 32 | 64); //SWP_FRAMECHANGED = 0x0020 (32); //SWP_SHOWWINDOW = 0x0040 (64)
            #endif
        } else {
            #if !UNITY_EDITOR
            SetWindowLong (hwnd, -20, ~((uint)524288) | ((uint)32));//GWL_EXSTYLE=-20; WS_EX_LAYERED=524288=&h80000, WS_EX_TRANSPARENT=32=0x00000020L
            SetWindowLong(hwnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);
            SetLayeredWindowAttributes (hwnd, 0, 255, 2);
            SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, fWidth, fHeight, 32 | 64); //SWP_FRAMECHANGED = 0x0020 (32); //SWP_SHOWWINDOW = 0x0040 (64)
            #endif
        }
        prevClickThrough = clickThrough;
    }
}

void OnRenderImage(RenderTexture from, RenderTexture to)
{
    Graphics.Blit(from, to, m_Material);
}}

我希望这里有人可以帮助我！ :( 谢谢！

Answer 1

这对我有用。

首先，您只需要调用一次 SetWindowLong。
然后，使用 (-20) 而不是 GS_STYLE 作为语句的“else”一半。 像这样：

void Update ()
{    
    // Raycast stuff

    if (clickThrough != prevClickThrough) {
        if (clickThrough) {
            #if !UNITY_EDITOR
            SetWindowLong (hwnd, -20, (uint)524288 | (uint)32);
            //other code
            #endif
        } else {
            #if !UNITY_EDITOR
            SetWindowLong(hwnd, -20, WS_POPUP | WS_VISIBLE);
            //other code
            #endif
        }
        prevClickThrough = clickThrough;
    }
}