Qt-透明窗体之嵌入桌面内

 相关资料：

https://download.csdn.net/download/zhujianqiangqq/13713144    代码包下载

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += 
    main.cpp 
    windowDesktop.cpp

HEADERS += 
    windowDesktop.h

FORMS += 
    mainwindow.ui

LIBS += -lUser32

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RESOURCES += 
    resource.qrc

main.cpp

#include <windows.h>
#include <winuser.h>
#include <QApplication>
#include "windowDesktop.h"

BOOL enumUserWindowsCB(HWND hwnd,LPARAM lParam)
{
    long wflags = GetWindowLong(hwnd, GWL_STYLE);
    if(!(wflags & WS_VISIBLE)) return TRUE;

    HWND sndWnd;
    if( !(sndWnd=FindWindowEx(hwnd, NULL, L"SHELLDLL_DefView", NULL)) ) return TRUE;
    HWND targetWnd;
    if( !(targetWnd=FindWindowEx(sndWnd, NULL, L"SysListView32", L"FolderView")) ) return TRUE;

    HWND* resultHwnd = (HWND*)lParam;
    *resultHwnd = targetWnd;
    return FALSE;
}

HWND findDesktopIconWnd()
{
    HWND resultHwnd = NULL;
    EnumWindows((WNDENUMPROC)enumUserWindowsCB, (LPARAM)&resultHwnd);
    return resultHwnd;
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Dialog w;
    HWND desktopHwnd = findDesktopIconWnd();
    if (desktopHwnd)
        SetParent((HWND)w.winId(), desktopHwnd);
    w.setFixedSize(QSize(800, 400));
    w.show();
    return  a.exec();
}

windowDesktop.h

#ifndef WINDOWDESKTOP_H
#define WINDOWDESKTOP_H

#include "QObject"
#include "QDialog"
#include "QLineEdit"
#include "QPainter"
#include "QWidget"
#include "QBitmap"

class  Dialog :  public  QWidget
{
 Q_OBJECT
public :
 Dialog(QWidget *parent = 0);
 ~Dialog();

  virtual void paintEvent(QPaintEvent *event);
};


#endif // WINDOWDESKTOP_H

windowDesktop.cpp

#include "windowDesktop.h"

Dialog::Dialog(QWidget *parent)
    : QWidget(parent)
{    
    // 创建个LineEdit用来测试焦点
    QLineEdit *le = new QLineEdit(this);
}

Dialog::~Dialog()
{
}

void Dialog::paintEvent(QPaintEvent *event)
{
    QPainter p(this);
    p.fillRect(rect(), QColor(0, 0xff, 0, 33));
    return;
}