Delphi 窗口置顶的方法

最新推荐文章于 2019-11-07 11:43:28 发布

最新推荐文章于 2019-11-07 11:43:28 发布 · 195 阅读

本文深入探讨了在不同操作系统环境下实现窗口置顶的多种方法，包括使用API函数如ShowWindow、SetWindowPos，以及利用Delphi编程语言中的自定义函数ForceForegroundWindow来动态调整窗口层级，确保应用界面在多任务环境中始终保持最前位置。

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有几种窗口置顶的方法，简单的有：

ShowWindow(窗口句柄,sw_ShowNormal);

SetWindowPos(窗口句柄,HWND_NOTOPMOST,0,0,0,0,SWP_NOMOV OR SWP_NOSIZE OR SWP_SHOWWINDOW);

另一种方式是：

function ForceForegroundWindow(hwnd: THandle): boolean;
const
SPI_GETFOREGROUNDLOCKTIMEOUT = $2000;
SPI_SETFOREGROUNDLOCKTIMEOUT = $2001;
var
ForegroundThreadID: DWORD;
ThisThreadID : DWORD;
timeout : DWORD;
begin
if IsIconic(hwnd) then ShowWindow(hwnd, SW_RESTORE);

// Windows 98/2000 doesn't want to foreground a window when some other
// window has keyboard focus

if ((Win32Platform = VER_PLATFORM_WIN32_NT) and (Win32MajorVersion > 4))
or
((Win32Platform = VER_PLATFORM_WIN32_WINDOWS) and
((Win32MajorVersion > 4) or ((Win32MajorVersion = 4) and
(Win32MinorVersion > 0)))) then begin
// Code from Karl E. Peterson,www.mvps.org/vb/sample.htm
// Converted to Delphi by Ray Lischner
// Published in The Delphi Magazine 55, page 16

Result := false;
ForegroundThreadID := GetWindowThreadProcessID(GetForegroundWindow,nil);
ThisThreadID := GetWindowThreadPRocessId(hwnd,nil);
if AttachThreadInput(ThisThreadID, ForegroundThreadID, true) then begin
BringWindowToTop(hwnd); // IE 5.5 related hack
SetForegroundWindow(hwnd);
AttachThreadInput(ThisThreadID, ForegroundThreadID, false);
Result := (GetForegroundWindow = hwnd);
end;

if not Result then begin
// Code by Daniel P. Stasinski
SystemParametersInfo(SPI_GETFOREGROUNDLOCKTIMEOUT, 0, @timeout, 0);
SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0, TObject(0), SPIF_SENDCHANGE);
BringWindowToTop(hwnd); // IE 5.5 related hack
SetForegroundWindow(hWnd);
SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0, TObject(timeout), SPIF_SENDCHANGE);
end;
end
else begin
BringWindowToTop(hwnd); // IE 5.5 related hack
SetForegroundWindow(hwnd);
end;

Result := (GetForegroundWindow = hwnd);
end;

另外，主窗体有个置顶的属性FormStyle, 设置为fsStayOnTop就可以直接置顶了。