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這篇文章主要介紹“Qt如何實(shí)現(xiàn)通用無邊框拖動(dòng)拉伸”，在日常操作中，相信很多人在Qt如何實(shí)現(xiàn)通用無邊框拖動(dòng)拉伸問題上存在疑惑，小編查閱了各式資料，整理出簡(jiǎn)單好用的操作方法，希望對(duì)大家解答”Qt如何實(shí)現(xiàn)通用無邊框拖動(dòng)拉伸”的疑惑有所幫助！接下來，請(qǐng)跟著小編一起來學(xué)習(xí)吧！
相信各位CS結(jié)構(gòu)開發(fā)的程序員，多多少少都遇到過需要美化界面的事情，一般都不會(huì)采用系統(tǒng)的標(biāo)題欄，這樣就需要無邊框標(biāo)題欄窗體，默認(rèn)的話無邊框的標(biāo)題欄都不支持拉伸和拖動(dòng)的，畢竟去掉了標(biāo)題欄則意味著失去了系統(tǒng)的窗體的屬性，拉伸和拖動(dòng)都需要自己寫代碼去實(shí)現(xiàn)，網(wǎng)上有很多類似的開源的方案，我也看過不少，總體來說復(fù)雜了些，對(duì)于初學(xué)者來說有可能看的云里霧里的，比如邊框四周八個(gè)方位都可以自由拉伸這塊，我的思路是針對(duì)設(shè)定的八個(gè)方位的區(qū)域進(jìn)行識(shí)別鼠標(biāo)是否按下，按下的哪個(gè)部位則執(zhí)行什么拉伸策略，鼠標(biāo)移到哪個(gè)位置則對(duì)應(yīng)改變鼠標(biāo)指針形狀，更淺顯易懂一些，至于拖動(dòng)移動(dòng)，還可以設(shè)置拖動(dòng)的標(biāo)題欄的高度等。
主要功能：
可以指定需要無邊框的widget
邊框四周八個(gè)方位都可以自由拉伸
可設(shè)置對(duì)應(yīng)位置的邊距,以便識(shí)別更大區(qū)域
可設(shè)置是否允許拖動(dòng)
可設(shè)置是否允許拉伸
bool FramelessWidget::eventFilter(QObject *watched, QEvent *event)
{
if (widget != 0 && watched == widget) {
if (event->type() == QEvent::Resize) {
//重新計(jì)算八個(gè)描點(diǎn)的區(qū)域,描點(diǎn)區(qū)域的作用還有就是計(jì)算鼠標(biāo)坐標(biāo)是否在某一個(gè)區(qū)域內(nèi)
int width = widget->width();
int height = widget->height();
//左側(cè)描點(diǎn)區(qū)域
rectLeft = QRect(0, padding, padding, height - padding * 2);
//上側(cè)描點(diǎn)區(qū)域
rectTop = QRect(padding, 0, width - padding * 2, padding);
//右側(cè)描點(diǎn)區(qū)域
rectRight = QRect(width - padding, padding, padding, height - padding * 2);
//下側(cè)描點(diǎn)區(qū)域
rectBottom = QRect(padding, height - padding, width - padding * 2, padding);
//左上角描點(diǎn)區(qū)域
rectLeftTop = QRect(0, 0, padding, padding);
//右上角描點(diǎn)區(qū)域
rectRightTop = QRect(width - padding, 0, padding, padding);
//左下角描點(diǎn)區(qū)域
rectLeftBottom = QRect(0, height - padding, padding, padding);
//右下角描點(diǎn)區(qū)域
rectRightBottom = QRect(width - padding, height - padding, padding, padding);
} else if (event->type() == QEvent::HoverMove) {
//設(shè)置對(duì)應(yīng)鼠標(biāo)形狀,這個(gè)必須放在這里而不是下面,因?yàn)榭梢栽谑髽?biāo)沒有按下的時(shí)候識(shí)別
QHoverEvent *hoverEvent = (QHoverEvent *)event;
QPoint point = hoverEvent->pos();
if (resizeEnable) {
if (rectLeft.contains(point)) {
widget->setCursor(Qt::SizeHorCursor);
} else if (rectRight.contains(point)) {
widget->setCursor(Qt::SizeHorCursor);
} else if (rectTop.contains(point)) {
widget->setCursor(Qt::SizeVerCursor);
} else if (rectBottom.contains(point)) {
widget->setCursor(Qt::SizeVerCursor);
} else if (rectLeftTop.contains(point)) {
widget->setCursor(Qt::SizeFDiagCursor);
} else if (rectRightTop.contains(point)) {
widget->setCursor(Qt::SizeBDiagCursor);
} else if (rectLeftBottom.contains(point)) {
widget->setCursor(Qt::SizeBDiagCursor);
} else if (rectRightBottom.contains(point)) {
widget->setCursor(Qt::SizeFDiagCursor);
} else {
widget->setCursor(Qt::ArrowCursor);
}
}
//根據(jù)當(dāng)前鼠標(biāo)位置,計(jì)算XY軸移動(dòng)了多少
int offsetX = point.x() - lastPos.x();
int offsetY = point.y() - lastPos.y();
//根據(jù)按下處的位置判斷是否是移動(dòng)控件還是拉伸控件
if (moveEnable) {
if (pressed) {
widget->move(widget->x() + offsetX, widget->y() + offsetY);
}
}
if (resizeEnable) {
if (pressedLeft) {
int resizeW = widget->width() - offsetX;
if (widget->minimumWidth() <= resizeW) {
widget->setGeometry(widget->x() + offsetX, rectY, resizeW, rectH);
}
} else if (pressedRight) {
widget->setGeometry(rectX, rectY, rectW + offsetX, rectH);
} else if (pressedTop) {
int resizeH = widget->height() - offsetY;
if (widget->minimumHeight() <= resizeH) {
widget->setGeometry(rectX, widget->y() + offsetY, rectW, resizeH);
}
} else if (pressedBottom) {
widget->setGeometry(rectX, rectY, rectW, rectH + offsetY);
} else if (pressedLeftTop) {
int resizeW = widget->width() - offsetX;
int resizeH = widget->height() - offsetY;
if (widget->minimumWidth() <= resizeW) {
widget->setGeometry(widget->x() + offsetX, widget->y(), resizeW, resizeH);
}
if (widget->minimumHeight() <= resizeH) {
widget->setGeometry(widget->x(), widget->y() + offsetY, resizeW, resizeH);
}
} else if (pressedRightTop) {
int resizeW = rectW + offsetX;
int resizeH = widget->height() - offsetY;
if (widget->minimumHeight() <= resizeH) {
widget->setGeometry(widget->x(), widget->y() + offsetY, resizeW, resizeH);
}
} else if (pressedLeftBottom) {
int resizeW = widget->width() - offsetX;
int resizeH = rectH + offsetY;
if (widget->minimumWidth() <= resizeW) {
widget->setGeometry(widget->x() + offsetX, widget->y(), resizeW, resizeH);
}
if (widget->minimumHeight() <= resizeH) {
widget->setGeometry(widget->x(), widget->y(), resizeW, resizeH);
}
} else if (pressedRightBottom) {
int resizeW = rectW + offsetX;
int resizeH = rectH + offsetY;
widget->setGeometry(widget->x(), widget->y(), resizeW, resizeH);
}
}
} else if (event->type() == QEvent::MouseButtonPress) {
//記住當(dāng)前控件坐標(biāo)和寬高以及鼠標(biāo)按下的坐標(biāo)
QMouseEvent *mouseEvent = (QMouseEvent *)event;
rectX = widget->x();
rectY = widget->y();
rectW = widget->width();
rectH = widget->height();
lastPos = mouseEvent->pos();
//判斷按下的手柄的區(qū)域位置
if (rectLeft.contains(lastPos)) {
pressedLeft = true;
} else if (rectRight.contains(lastPos)) {
pressedRight = true;
} else if (rectTop.contains(lastPos)) {
pressedTop = true;
} else if (rectBottom.contains(lastPos)) {
pressedBottom = true;
} else if (rectLeftTop.contains(lastPos)) {
pressedLeftTop = true;
} else if (rectRightTop.contains(lastPos)) {
pressedRightTop = true;
} else if (rectLeftBottom.contains(lastPos)) {
pressedLeftBottom = true;
} else if (rectRightBottom.contains(lastPos)) {
pressedRightBottom = true;
} else {
pressed = true;
}
} else if (event->type() == QEvent::MouseMove) {
//改成用HoverMove識(shí)別
} else if (event->type() == QEvent::MouseButtonRelease) {
//恢復(fù)所有
pressed = false;
pressedLeft = false;
pressedRight = false;
pressedTop = false;
pressedBottom = false;
pressedLeftTop = false;
pressedRightTop = false;
pressedLeftBottom = false;
pressedRightBottom = false;
widget->setCursor(Qt::ArrowCursor);
}
}
return QObject::eventFilter(watched, event);
}
到此，關(guān)于“Qt如何實(shí)現(xiàn)通用無邊框拖動(dòng)拉伸”的學(xué)習(xí)就結(jié)束了，希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí)，快去試試吧！若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí)，請(qǐng)繼續(xù)關(guān)注億速云網(wǎng)站，小編會(huì)繼續(xù)努力為大家?guī)砀鄬?shí)用的文章！
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