Qt 无边框窗口自定义标题栏

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实现了自定义标题栏的最小化，最大化（自适应任务栏），关闭，拉伸，拖曳。

因为不想引入其他资源，所以按钮，背景都是系统提供的。

效果图：

直接上代码。

用法：

#include "widget.h"
#include <QApplication>
#include "CustomFrame.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget *w = new Widget();CustomFrame frame(w, "CustomFrame");frame.show();return a.exec();
}

#pragma once#include <QFrame>class QToolButton;
class CustomFrame : public QFrame
{Q_OBJECT
public:explicit CustomFrame(QWidget *contentWidget, const QString &title);public slots:void slotShowSmall();void slotShowMaxRestore();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 *contentWidget_;QPixmap maxPixmap_;QPixmap restorePixmap_;QToolButton *maxButton_;
};

#include "CustomFrame.h"
#include <QtWidgets>static const int TITLE_HEIGHT = 30;
static const int FRAME_BORDER = 2;
CustomFrame::CustomFrame(QWidget *contentWidget, const QString &title): contentWidget_(contentWidget)
{this->setWindowFlags(Qt::FramelessWindowHint);this->setAttribute(Qt::WA_TranslucentBackground);this->setMouseTracking(true);isMax_ = false;isPress_ = false;QLabel *logoLabel = new QLabel();QPixmap logoPixmap = this->style()->standardPixmap(QStyle::SP_TitleBarMenuButton);logoLabel->setPixmap(logoPixmap);logoLabel->setFixedSize(16, 16);logoLabel->setScaledContents(true);QLabel *titleLabel = new QLabel();titleLabel->setText(title);QFont titleFont = titleLabel->font();titleFont.setBold(true);titleLabel->setFont(titleFont);titleLabel->setObjectName("whiteLabel");QToolButton *minButton = new QToolButton();QPixmap minPixmap = this->style()->standardPixmap(QStyle::SP_TitleBarMinButton);minButton->setIcon(minPixmap);connect(minButton, SIGNAL(clicked()), this, SLOT(slotShowSmall()));maxButton_ = new QToolButton();maxPixmap_ = this->style()->standardPixmap(QStyle::SP_TitleBarMaxButton);restorePixmap_ = this->style()->standardPixmap(QStyle::SP_TitleBarNormalButton);maxButton_->setIcon(maxPixmap_);connect(maxButton_, SIGNAL(clicked()), this, SLOT(slotShowMaxRestore()));QToolButton *closeButton = new QToolButton();QPixmap closePixmap = this->style()->standardPixmap(QStyle::SP_TitleBarCloseButton);closeButton->setIcon(closePixmap);connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));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(maxButton_, 0, Qt::AlignTop);titleLayout->addWidget(closeButton, 0, Qt::AlignTop);titleLayout->setSpacing(0);titleLayout->setContentsMargins(5, 0, 0, 0);QWidget *titleWidget = new QWidget();titleWidget->setLayout(titleLayout);titleWidget->installEventFilter(0);QVBoxLayout *mainLayout = new QVBoxLayout();mainLayout->addWidget(titleWidget);mainLayout->addWidget(contentWidget_);mainLayout->setSpacing(0);mainLayout->setMargin(5);this->setLayout(mainLayout);
}void CustomFrame::slotShowSmall()
{this->showMinimized();
}void CustomFrame::slotShowMaxRestore()
{if (isMax_) {this->showNormal();maxButton_->setIcon(maxPixmap_);} else {this->showMaximized();maxButton_->setIcon(restorePixmap_);}isMax_ = !isMax_;
}void CustomFrame::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 CustomFrame::mouseMoveEvent(QMouseEvent *e)
{if (isMax_ || !isPress_) {return;}this->move(e->globalPos() - clickPos_);
}void CustomFrame::mouseReleaseEvent(QMouseEvent *)
{isPress_ = false;
}bool CustomFrame::nativeEvent(const QByteArray & eventType, void * message, long * result)
{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 CustomFrame::paintEvent(QPaintEvent *e)
{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::white));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::white);// 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);
}

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