通用控件移动.zip

#include "movewidget.h" #include "qevent.h" #include "qdebug.h" MoveWidget::MoveWidget(QObject *parent) : QObject(parent) { lastPoint = QPoint(0, 0); pressed = false; leftButton = true; inControl = true; widget = 0; } bool MoveWidget::eventFilter(QObject *watched, QEvent *event) { if (widget && watched == widget) { QMouseEvent *mouseEvent = (QMouseEvent *)event; if (mouseEvent->type() == QEvent::MouseButtonPress) { //如果限定了只能鼠标左键拖动则判断当前是否是鼠标左键 if (leftButton && mouseEvent->button() != Qt::LeftButton) { return false; } //判断控件的区域是否包含了当前鼠标的坐标 if (widget->rect().contains(mouseEvent->pos())) { lastPoint = mouseEvent->pos(); pressed = true; } } else if (mouseEvent->type() == QEvent::MouseMove && pressed) { //计算坐标偏移值,调用move函数移动过去 int offsetX = mouseEvent->pos().x() - lastPoint.x(); int offsetY = mouseEvent->pos().y() - lastPoint.y(); int x = widget->x() + offsetX; int y = widget->y() + offsetY; if (inControl) { //可以自行调整限定在容器中的范围,这里默认保留20个像素在里面 int offset = 20; bool xyOut = (x + widget->width() < offset || y + widget->height() < offset); bool whOut = false; QWidget *w = (QWidget *)widget->parent(); if (w) { whOut = (w->width() - x < offset || w->height() - y < offset); } if (xyOut || whOut) { return false; } } widget->move(x, y); } else if (mouseEvent->type() == QEvent::MouseButtonRelease && pressed) { pressed = false; } } return QObject::eventFilter(watched, event); } void MoveWidget::setLeftButton(bool leftButton) { this->leftButton = leftButton; } void MoveWidget::setInControl(bool inControl) { this->inControl = inControl; } void MoveWidget::setWidget(QWidget *widget) { if (this->widget == 0) { this->widget = widget; this->widget->installEventFilter(this); } }