我需要控制主窗口的z轴顺序。永远高高在上不是我的案子。我想把我的窗口放在其他窗口的后面,桌面的上面。这可能吗?是否有类似于c++的SetWindowPos函数?或者可能有一些变通方法?
首先,您应该将窗口发送到z-index堆栈的后面/底部,然后禁用窗口的z-index更改
我试着让它在我的项目中工作,最终成功了,如下所示。
但是,请注意我的一些代码注释可能不准确。我不是很了解node-ffi,只是通过反复试验才让它工作;我的代码注释只是我试图让我观察到的行为"有意义"的尝试。
import ffi from "ffi";
import ref from "ref";
import Struct from "ref-struct";
const HWND_BOTTOM = 1;
export let SetWindowPos_Flags = {
NOSIZE: 0x0001,
NOMOVE: 0x0002,
NOACTIVATE: 0x0010,
}
export var user32 = new ffi.Library("user32", {
// return, handle, handleInsertAfter, x, y, cx, cy, flags
SetWindowPos: ["bool", ["int32", "int32", "int32", "int32", "int32", "int32", "uint32"]],
});
export function SendWindowToBack(handle: number) {
user32.SetWindowPos(handle, HWND_BOTTOM, 0, 0, 0, 0, SetWindowPos_Flags.NOMOVE | SetWindowPos_Flags.NOSIZE | SetWindowPos_Flags.NOACTIVATE);
}
export const WM_WINDOWPOSCHANGING = 0x0046;
export const SWP_NOZORDER = 0x0004;
let WINDOWPOS = Struct({
hwndInsertAfter: ffi.types.int32,
hwnd: ffi.types.int32,
x: ffi.types.int32,
y: ffi.types.int32,
cx: ffi.types.int32,
cy: ffi.types.int32,
flags: ffi.types.uint32,
});
export function AddHook(window: Electron.BrowserWindow, disableZIndexChanging = false) {
window.hookWindowMessage(WM_WINDOWPOSCHANGING, (wParam: Buffer, lParam: Buffer)=> {
// The "lParam" buffer holds the address to a place in unmanaged memory, which itself holds the address to the actual (unmanaged) struct-data.
// Thus: js-pseudo-pointer (8-bytes; the lParam Buffer) -> c-pointer (8-bytes, unmanaged) -> struct-data (28-bytes, unmanaged)
// However, the lParam buffer does not realize it is/could-be a "pseudo-pointer" -- all it knows is that it's holding some random numbers.
// To access the unmanaged struct-data, we have to tell the js-side that the contents of lParam are actually the address explained above.
// Then we'll be able to use the Buffer.deref() function to correctly obtain the final struct-data.
// To do this, we:
// 1) Create a new js-pseudo-pointer (using the modified Buffer class), whose contents/what-it-points-to is marked as of type "pointer to a pointer" (ie. the c-pointer entry above)
let lParam2 = Buffer.alloc(8);
lParam2["type"] = ref.refType(WINDOWPOS);
// 2) Fill the js-pseudo-pointer with the actual address to that c-pointer (just copy this address from the unmarked lParam Buffer)
lParam.copy(lParam2);
// 3) Dereference our js-pseudo-pointer, retrieving the actual struct-data bytes
let actualStructDataBuffer = lParam2["deref"]() as Buffer;
// 4) Convert the struct-data bytes into a regular JavaScript object
let windowPos = actualStructDataBuffer["deref"]() as {hwndInsertAfter: number, hwnd: number, x: number, y: number, cx: number, cy: number, flags: number};
// 5) Modify the 7th integer (the flags field) in the (unmanaged) struct-data, to include the new SWP_NOZORDER flag
if (disableZIndexChanging) {
//lParam.flags |= SWP_NOZORDER;
let newFlags = windowPos.flags | SWP_NOZORDER;
actualStructDataBuffer.writeUInt32LE(newFlags, 6);
}
});
}
// This is the function you actually call from the rest of your program.
export function SendElectronWindowToBackAndKeepItThere(window: Electron.BrowserWindow) {
let handleAsBuffer = window.getNativeWindowHandle();
let handleAsNumber = ref.types.int64.get(handleAsBuffer, 0);
SendWindowToBack(handleAsNumber);
AddHook(window, true);
}
如果你不能用父/子窗口完成,那么你可以通过node-ffi
调用SetWindowPos()
(或者写一个本地Node模块/插件)。要获取BrowserWindow
的HWND
,调用getNativeWindowHandle()
。我不知道你如何在macOS或Ubuntu上做这个。
您可以在窗口上调用.blur()
。它将使它位于其他窗口的下方。