53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
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#include "movewidget.h"
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#include "qevent.h"
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#include "qdebug.h"
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MoveWidget::MoveWidget(QObject *parent) : QObject(parent)
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{
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lastPoint = QPoint(0, 0);
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pressed = false;
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leftButton = true;
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widget = 0;
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}
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bool MoveWidget::eventFilter(QObject *watched, QEvent *event)
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{
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if (widget != 0 && watched == widget) {
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QMouseEvent *mouseEvent = (QMouseEvent *)event;
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if (mouseEvent->type() == QEvent::MouseButtonPress) {
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//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
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if (leftButton && mouseEvent->button() != Qt::LeftButton) {
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return false;
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}
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//判断控件的区域是否包含了当前鼠标的坐标
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if (widget->rect().contains(mouseEvent->pos())) {
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lastPoint = mouseEvent->pos();
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pressed = true;
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}
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} else if (mouseEvent->type() == QEvent::MouseMove && pressed) {
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//计算坐标偏移值,调用move函数移动过去
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int offsetX = mouseEvent->pos().x() - lastPoint.x();
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int offsetY = mouseEvent->pos().y() - lastPoint.y();
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widget->move(widget->x() + offsetX, widget->y() + offsetY);
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} else if (mouseEvent->type() == QEvent::MouseButtonRelease && pressed) {
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pressed = false;
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}
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}
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return QObject::eventFilter(watched, event);
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}
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void MoveWidget::setWidget(QWidget *widget)
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{
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if (this->widget == 0) {
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this->widget = widget;
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this->widget->installEventFilter(this);
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}
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}
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void MoveWidget::setLeftButton(bool leftButton)
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{
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this->leftButton = leftButton;
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}
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