提要

自定义的弹出窗口，窗口可以实现按下鼠标拖动，鼠标释放停止拖动，窗口种含有子控件，下拉列表，在点击下拉列表时窗口移动。

解决方法

因为点击下拉列表的时候，触发了窗口的移动事件，所以添加下拉列表的事件过滤。

下面附上实现代码：

ui->comboBoxReso->installEventFilter(this);bool ResolutionDialog::eventFilter(QObject *obj, QEvent *event){if(obj == ui->comboBoxReso){if(event->type() == QEvent::MouseMove){return true;}}return QDialog::eventFilter(obj,event);}

ui文件的结构如下：

在构造函数种安装控件的事件过滤器。然后重写过滤事件。

完整的代码如下：

resolutiondialog.h

#ifndef RESOLUTIONDIALOG_H#define RESOLUTIONDIALOG_H#include <QDialog>#include "datastruct.h"/***********类功能描述：分辨率设置对话框************/namespace Ui {class ResolutionDialog;}class ResolutionDialog : public QDialog{Q_OBJECTpublic:explicit ResolutionDialog(QWidget *parent = nullptr);~ResolutionDialog();//初始化void initResolutions();//初始化下拉列表的分辨率protected:bool eventFilter(QObject *obj, QEvent *event);//过滤事件,过滤掉下拉列表的点击事件void mousePressEvent(QMouseEvent *event);//鼠标点击void mouseMoveEvent(QMouseEvent *event);//鼠标移动事件void mouseReleaseEvent(QMouseEvent *event);//鼠标释放事件signals:void sigEveryResolution(stuReso &stuResolution);//发送每块屏的屏幕分辨率public slots:void onSetRowColSlot(int row,int col);//设置SpinBox的行列信息private slots:void on_closeBtn_clicked();//关闭按钮void on_confirmBtn_clicked();//确定按钮void on_cancelBtn_clicked();//取消按钮private:Ui::ResolutionDialog *ui;QPoint m_offPos;//鼠标点击点与窗口左上角之间的距离};#endif // RESOLUTIONDIALOG_H

resolutiondialog.cpp

#include "resolutiondialog.h"#include "ui_resolutiondialog.h"#include <QStyledItemDelegate>ResolutionDialog::ResolutionDialog(QWidget *parent) :QDialog(parent),ui(new Ui::ResolutionDialog){ui->setupUi(this);initResolutions();QStyledItemDelegate *delegate = new QStyledItemDelegate();ui->comboBoxReso->setItemDelegate(delegate);ui->comboBoxReso->installEventFilter(this);setWindowFlag(Qt::FramelessWindowHint);setAttribute(Qt::WA_TranslucentBackground);}ResolutionDialog::~ResolutionDialog(){delete ui;}void ResolutionDialog::initResolutions(){QList<QString> strList;strList.append("3840x2160");strList.append("1920x1080");strList.append("1680x1050");strList.append("1600x900");strList.append("1440x900");strList.append("1366x768");strList.append("1280x1024");QStringList strResoList(strList);ui->comboBoxReso->addItems(strResoList);}bool ResolutionDialog::eventFilter(QObject *obj, QEvent *event){if(obj == ui->comboBoxReso){if(event->type() == QEvent::MouseMove){return true;}}return QDialog::eventFilter(obj,event);}void ResolutionDialog::mousePressEvent(QMouseEvent *event){if (event->button() == Qt::LeftButton) {QPoint startPos = event->globalPos();m_offPos = startPos - geometry().topLeft();}QDialog::mousePressEvent(event);}void ResolutionDialog::mouseMoveEvent(QMouseEvent *event){if (event->buttons() == Qt::LeftButton) {QPoint endPos = event->globalPos();move(endPos - m_offPos);}QDialog::mouseMoveEvent(event);}void ResolutionDialog::mouseReleaseEvent(QMouseEvent *event){QDialog::mouseReleaseEvent(event);}void ResolutionDialog::onSetRowColSlot(int row, int col){ui->spinBoxRow->setRange(0,row-1);ui->spinBoxCol->setRange(0,col-1);}void ResolutionDialog::on_closeBtn_clicked(){close();}void ResolutionDialog::on_confirmBtn_clicked(){stuReso tempReso;tempReso.row = ui->spinBoxRow->value();tempReso.col = ui->spinBoxCol->value();QString strTemp = ui->comboBoxReso->currentText();QStringList strList = strTemp.split('x');QString strW = strList.first();QString strH = strList.last();tempReso.width = strW.toInt();tempReso.height = strH.toInt();emit sigEveryResolution(tempReso);accept();}void ResolutionDialog::on_cancelBtn_clicked(){reject();}

上面只将这个出现上述问题的类的代码附上。因为其中涉及到项目中的一些需求实现，读者可以选择性读取，理解我说明的问题解决思路便好，代码可以参考。由于涉及到qss文件设置样式，那部分没有贴出来，读者可以注释掉背景透明和无边框的设置。