QT自定义窗口（模拟MainWindow）

时间：2022-05-02 21:16:47

在这里自定义窗口是通过继承于QFrame，内部分为上下两部分，上半部分就是标题栏，下面是窗口的具体内容。上下两部分通过布局固定位置。最后窗口的各种鼠标拖动，缩放，等操作通过添加鼠标事件来完成一个窗口的常规功能。当然，这个标题栏可以通过布局的改变把它放到任意地方。

下面是实现的代码： 
#pragma once 
#ifndef CUSTOMWIDGET_H_ 
#define CUSTOMWIDGET_H_

#include <QtWidgets/QFrame>

class QToolButton; 
class CustomWidget : public QFrame 
{

Q_OBJECT

public:

explicit CustomWidget();

~CustomWidget();

void setContentWidget(QWidget *contentWidget);

void setTitleInfo(const QString &titleString, const QPixmap &windowIcon);

public slots:

void slotShowSmall();

void slotShowMaxRestore();

void onMoveWindow();

signals:

void moveWindow();

protected:

void mousePressEvent(QMouseEvent *);

void mouseMoveEvent(QMouseEvent *);

void mouseReleaseEvent(QMouseEvent *);

bool nativeEvent(const QByteArray & eventType, void * message, long * result);

void paintEvent(QPaintEvent *);

private:

bool isMax;

bool isPress;

QPoint startPos;

QPoint clickPos;

QWidget *m_pTitleWidget;//顶栏窗体

QWidget *m_pContentWidget;//内容窗体

QPixmap maxPixmap;

QPixmap restorePixmap;

QToolButton *m_pMaxButton;

};

#endif //!CUSTOMWIDGET_H_

customWidget.cpp:

#include "stdafx.h" 
#include "customwidget.h" 
#include <QtWidgets/QLabel> 
#include <QtWidgets/QToolButton> 
#include <QtWidgets/QHBoxLayout> 
#include <QtCore/QEvent> 
#include <Window.h>

static const int TITLE_HEIGHT = 40;//标题栏高度 
static const int FRAME_BORDER = 2；//边框宽度 
CustomWidget::CustomWidget() 
: m_pContentWidget(0) 
//, m_llLocalWinId(0) 
//, m_llRemoteWinId(0) 
{

this->setWindowFlags(Qt::FramelessWindowHint);

this->setAttribute(Qt::WA_TranslucentBackground);

this->setMouseTracking(true);

isMax = false;

isPress = false;

m_pTitleWidget = new QWidget();

}

CustomWidget::~CustomWidget() 
{ 
}

void CustomWidget::setContentWidget(QWidget *contentWidget) 
{

if (contentWidget)

{

    m_pContentWidget = contentWidget;

    m_pContentWidget->move(m_pTitleWidget->rect().bottomLeft());

    m_pContentWidget->show();

    resize(m_pTitleWidget->width(), m_pTitleWidget->height() + m_pContentWidget->height());

}

}

void CustomWidget::setTitleInfo(const QString &titleString, const QPixmap &windowIcon) 
{

QLabel *logoLabel = new QLabel();

logoLabel->setPixmap(windowIcon);

logoLabel->setFixedSize(16, 16);

logoLabel->setScaledContents(true);

QLabel *titleLabel = new QLabel();

titleLabel->setText(titleString);

QFont titleFont = titleLabel->font();

titleFont.setBold(true);

titleLabel->setFont(titleFont);

titleLabel->setObjectName("whiteLabel");

titleLabel->setStyleSheet("color:white;");

QToolButton *minButton = new QToolButton();

connect(minButton, SIGNAL(clicked()), this, SLOT(slotShowSmall()));

m_pMaxButton = new QToolButton();

connect(m_pMaxButton, SIGNAL(clicked()), this, SLOT(slotShowMaxRestore()));

QToolButton *closeButton = new QToolButton();

connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));

connect(this, SIGNAL(moveWindow()), this, SLOT(onMoveWindow()));

QHBoxLayout *titleLayout = new QHBoxLayout();

titleLayout->addWidget(logoLabel);

titleLayout->addWidget(titleLabel);

titleLabel->setContentsMargins(5, 0, 0, 0);

titleLayout->addStretch();

titleLayout->addWidget(minButton, 0, Qt::AlignTop);

titleLayout->addWidget(m_pMaxButton, 0, Qt::AlignTop);

titleLayout->addWidget(closeButton, 0, Qt::AlignTop);

titleLayout->setSpacing(0);

titleLayout->setContentsMargins(5, 0, 0, 0);

m_pTitleWidget->setFixedSize(600, TITLE_HEIGHT);

m_pTitleWidget->setLayout(titleLayout);

m_pTitleWidget->installEventFilter(0);

m_pTitleWidget->setAutoFillBackground(true);

QPalette palette;

palette.setColor(QPalette::Background, QColor(31,25,25));

m_pTitleWidget->setPalette(palette);

}

void CustomWidget::slotShowSmall()//最小化 
{ 
this->showMinimized(); 
}

void CustomWidget::slotShowMaxRestore()//还原按钮 
{

if (isMax) {

    this->showNormal();

    m_pMaxButton->setIcon(maxPixmap);

}

else {

    this->showMaximized();

    m_pMaxButton->setIcon(restorePixmap);

}

isMax = !isMax;

}

void CustomWidget::onMoveWindow() 
{ 
//m_pContentWidget->move(m_pTitleWidget->rect().bottomLeft()); 
}

void CustomWidget::mousePressEvent(QMouseEvent *e) 
{

startPos = e->globalPos();

clickPos = e->pos();

if (e->button() == Qt::LeftButton) {

    if (e->type() == QEvent::MouseButtonPress) {

        isPress = true;

    }

    else if (e->type() == QEvent::MouseButtonDblClick && e->pos().y() <= TITLE_HEIGHT) {

        this->slotShowMaxRestore();

    }

}

}

void CustomWidget::mouseMoveEvent(QMouseEvent *e) 
{

if (isMax || !isPress) {

    return;

}

this->move(e->globalPos() - clickPos);

emit moveWindow();

}

void CustomWidget::mouseReleaseEvent(QMouseEvent *) 
{ 
isPress = false; 
}

bool CustomWidget::nativeEvent(const QByteArray & eventType, void * message, long * result)//实现拖拽边框的效果 
{

Q_UNUSED(eventType);

const int HIT_BORDER = 5;

const MSG *msg = static_cast<MSG*>(message);

if (msg->message == WM_NCHITTEST) {

    int xPos = ((int)(short)LOWORD(msg->lParam)) - this->frameGeometry().x();

    int yPos = ((int)(short)HIWORD(msg->lParam)) - this->frameGeometry().y();

    if (this->childAt(xPos, yPos) == 0) {

        *result = HTCAPTION;

    }

    else {

        return false;

    }

    if (xPos > 0 && xPos < HIT_BORDER) {

        *result = HTLEFT;

    }

    if (xPos >(this->width() - HIT_BORDER) && xPos < (this->width() - 0)) {

        *result = HTRIGHT;

    }

    if (yPos > 0 && yPos < HIT_BORDER) {

        *result = HTTOP;

    }

    if (yPos >(this->height() - HIT_BORDER) && yPos < (this->height() - 0)) {

        *result = HTBOTTOM;

    }

    if (xPos > 0 && xPos < HIT_BORDER && yPos > 0 && yPos < HIT_BORDER) {

        *result = HTTOPLEFT;

    }

    if (xPos >(this->width() - HIT_BORDER) && xPos < (this->width() - 0) && yPos > 0 && yPos < HIT_BORDER) {

        *result = HTTOPRIGHT;

    }

    if (xPos > 0 && xPos < HIT_BORDER && yPos >(this->height() - HIT_BORDER) && yPos < (this->height() - 0)) {

        *result = HTBOTTOMLEFT;

    }

    if (xPos >(this->width() - HIT_BORDER) && xPos < (this->width() - 0) && yPos >(this->height() - HIT_BORDER) && yPos < (this->height() - 0)) {

        *result = HTBOTTOMRIGHT;

    }

    return true;

}

return false;

}

void CustomWidget::paintEvent(QPaintEvent *e) 
{//绘制边框

int border = FRAME_BORDER;

if (this->isMaximized()) {

    border = 0;

}

QPainter painter(this);

QPainterPath painterPath;

painterPath.setFillRule(Qt::WindingFill);

painterPath.addRect(border, border, this->width() - 2 * border, this->height() - 2 * border);

painter.setRenderHint(QPainter::Antialiasing, true);

painter.fillPath(painterPath, QBrush(Qt::black));

QColor color(200, 200, 200);

for (int i = 0; i<border; i++) {

    color.setAlpha((i + 1) * 30);

    painter.setPen(color);

    painter.drawRect(border - i, border - i, this->width() - (border - i) * 2, this->height() - (border - i) * 2);

}

painter.setPen(Qt::NoPen);

painter.setBrush(Qt::black);

// 这里可以在资源中指定一张标题背景图片

//painter.drawPixmap(QRect(border, border, this->width()-2*border, this->height()-2*border), QPixmap(DEFAULT_SKIN));

painter.drawRect(QRect(border, TITLE_HEIGHT, this->width() - 2 * border, this->height() - TITLE_HEIGHT - border));

QFrame::paintEvent(e);

} 
///////////////全文完

http://blog.csdn.net/u011915578/article/details/46924151

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