Qt制作Aero特效窗口

转载请注明链接与作者huihui1988

初学QT，边看书边自己做点小东西。最近突然心血来潮，想自己做个小巧点的，界面美观一点的备忘当桌面上。想了半天，发现VISTA/WIN7的Aero效果就不错，况且自己现在就在用WIN7。于是上网找了下QT制作Aero效果的方法。Google之后终于找到了函数和用法。于是做了一个简单的Aero特效窗口

以下是头文件和实现文件：

//qtwin.h
#ifndef QTWIN_H
#define QTWIN_H
#include <QColor>
#include <QWidget>
class WindowNotifier;
class QtWin
{
public:
    static bool enableAeroWindow(QWidget *widget, bool enable = true);
    static bool extendFrameIntoClientArea(QWidget *widget,
                                          int left = -1, int top = -1,
                                          int right = -1, int bottom = -1);
    static bool isCompositionEnabled();
    static QColor colorizatinColor();
private:
    static WindowNotifier *windowNotifier();
};
#endif // QTWIN_H
//qtwin.cpp
#include "qtwin.h"
#include <QLibrary>
#include <QApplication>
#include <QWidget>
#include <QList>
#include <QPointer>
#ifdef Q_WS_WIN
#include <qt_windows.h>
// Blur behind data structures
#define DWM_BB_ENABLE                 0x00000001  // fEnable has been specified
#define DWM_BB_BLURREGION             0x00000002  // hRgnBlur has been specified
#define DWM_BB_TRANSITIONONMAXIMIZED  0x00000004  // fTransitionOnMaximized has been specified
#define WM_DWMCOMPOSITIONCHANGED        0x031E    // Composition changed window message
typedef struct _DWM_BLURBEHIND
{
    DWORD dwFlags;
    BOOL fEnable;
    HRGN hRgnBlur;
    BOOL fTransitionOnMaximized;
} DWM_BLURBEHIND, *PDWM_BLURBEHIND;
typedef struct _MARGINS
{
    int cxLeftWidth;
    int cxRightWidth;
    int cyTopHeight;
    int cyBottomHeight;
} MARGINS, *PMARGINS;
typedef HRESULT (WINAPI *PtrDwmIsCompositionEnabled)(BOOL* pfEnabled);
typedef HRESULT (WINAPI *PtrDwmExtendFrameIntoClientArea)(HWND hWnd, const MARGINS* pMarInset);
typedef HRESULT (WINAPI *PtrDwmenableAeroWindow)(HWND hWnd, const DWM_BLURBEHIND* pBlurBehind);
typedef HRESULT (WINAPI *PtrDwmGetColorizationColor)(DWORD *pcrColorization, BOOL *pfOpaqueBlend);
static PtrDwmIsCompositionEnabled pDwmIsCompositionEnabled= 0;
static PtrDwmenableAeroWindow pDwmenableAeroWindow = 0;
static PtrDwmExtendFrameIntoClientArea pDwmExtendFrameIntoClientArea = 0;
static PtrDwmGetColorizationColor pDwmGetColorizationColor = 0;
/*
 *同步响应DWM状态消息
 */
class WindowNotifier : public QWidget
{
public:
    WindowNotifier() { winId(); }
    void addWidget(QWidget *widget) { widgets.append(widget); }
    void removeWidget(QWidget *widget) { widgets.removeAll(widget); }
    bool winEvent(MSG *message, long *result);
private:
    QWidgetList widgets;
};
static bool resolveLibs()
{
    if (!pDwmIsCompositionEnabled) {
        QLibrary dwmLib(QString::fromAscii("dwmapi"));
        pDwmIsCompositionEnabled =(PtrDwmIsCompositionEnabled)dwmLib.resolve("DwmIsCompositionEnabled");
        pDwmExtendFrameIntoClientArea = (PtrDwmExtendFrameIntoClientArea)dwmLib.resolve("DwmExtendFrameIntoClientArea");
        pDwmenableAeroWindow = (PtrDwmenableAeroWindow)dwmLib.resolve("DwmenableAeroWindow");
        pDwmGetColorizationColor = (PtrDwmGetColorizationColor)dwmLib.resolve("DwmGetColorizationColor");
    }
    return pDwmIsCompositionEnabled != 0;
}
#endif
/*!
  * 检查 DWM 是否开启
  *
  */
bool QtWin::isCompositionEnabled()
{
#ifdef Q_WS_WIN
    if (resolveLibs()) {
        HRESULT hr = S_OK;
        BOOL isEnabled = false;
        hr = pDwmIsCompositionEnabled(&isEnabled);
        if (SUCCEEDED(hr))
            return isEnabled;
    }
#endif
    return false;
}
/*!
  * 对一个widget实现Aero效果.
  *
  */
bool QtWin::enableAeroWindow(QWidget *widget, bool enable)
{
    Q_ASSERT(widget);
    bool result = false;
#ifdef Q_WS_WIN
    if (resolveLibs()) {
        DWM_BLURBEHIND bb = {0};
        HRESULT hr = S_OK;
        bb.fEnable = enable;
        bb.dwFlags = DWM_BB_ENABLE;
        bb.hRgnBlur = NULL;
        widget->setAttribute(Qt::WA_TranslucentBackground, enable);
        widget->setAttribute(Qt::WA_NoSystemBackground, enable);
        hr = pDwmenableAeroWindow(widget->winId(), &bb);
        if (SUCCEEDED(hr)) {
            result = true;
            windowNotifier()->addWidget(widget);
        }
    }
#endif
    return result;
}
/*!
  * 设置Aero绘图区
  */
bool QtWin::extendFrameIntoClientArea(QWidget *widget, int left, int top, int right, int bottom)
{
    Q_ASSERT(widget);
    Q_UNUSED(left);
    Q_UNUSED(top);
    Q_UNUSED(right);
    Q_UNUSED(bottom);
    bool result = false;
#ifdef Q_WS_WIN
    if (resolveLibs()) {
        QLibrary dwmLib(QString::fromAscii("dwmapi"));
        HRESULT hr = S_OK;
        MARGINS m = {left, top, right, bottom};
        hr = pDwmExtendFrameIntoClientArea(widget->winId(), &m);
        if (SUCCEEDED(hr)) {
            result = true;
            windowNotifier()->addWidget(widget);
        }
        widget->setAttribute(Qt::WA_TranslucentBackground, result);
    }
#endif
    return result;
}
/*!
  * 返回当前窗口颜色.
  */
QColor QtWin::colorizatinColor()
{
    QColor resultColor = QApplication::palette().window().color();
#ifdef Q_WS_WIN
    if (resolveLibs()) {
        DWORD color = 0;
        BOOL opaque = FALSE;
        QLibrary dwmLib(QString::fromAscii("dwmapi"));
        HRESULT hr = S_OK;
        hr = pDwmGetColorizationColor(&color, &opaque);
        if (SUCCEEDED(hr))
            resultColor = QColor(color);
    }
#endif
    return resultColor;
}
#ifdef Q_WS_WIN
WindowNotifier *QtWin::windowNotifier()
{
    static WindowNotifier *windowNotifierInstance = 0;
    if (!windowNotifierInstance)
        windowNotifierInstance = new WindowNotifier;
    return windowNotifierInstance;
}
/* 所有窗口响应 DWM 状态变换消息 */
bool WindowNotifier::winEvent(MSG *message, long *result)
{
    if (message && message->message == WM_DWMCOMPOSITIONCHANGED) {
        bool compositionEnabled = QtWin::isCompositionEnabled();
        foreach(QWidget * widget, widgets) {
            if (widget) {
                widget->setAttribute(Qt::WA_NoSystemBackground, compositionEnabled);
            }
            widget->update();
        }
    }
    return QWidget::winEvent(message, result);
}
#endif
使用的时候只需要在生成窗口的main.cpp中#include "qtwin.h"，并使用相关函数，以下是main.cpp文件：
#include <QtGui/QApplication>
#include "widget.h"
#include "qtwin.h"
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget window;
    window.setGeometry(1040,0,240,120);
    window.setWindowFlags(Qt::CustomizeWindowHint);
#ifdef Q_WS_X11
    window.setAttribute(Qt::WA_TranslucentBackground);
    window.setAttribute(Qt::WA_NoSystemBackground, false);
    QPalette pal = window.palette();
    QColor bg = pal.window().color();
    bg.setAlpha(180);
    pal.setColor(QPalette::Window, bg);
    window.setPalette(pal);
    window.ensurePolished(); // workaround Oxygen filling the background
    window.setAttribute(Qt::WA_StyledBackground, false);
#endif
    if (QtWin::isCompositionEnabled()) {
        QtWin::extendFrameIntoClientArea(&window);
        window.setContentsMargins(0, 0, 0, 0);
    }
    window.show();
    return a.exec();
}