怎么用Qt制作简单的日期选择界面

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Qt自带的日期选择控件过于丑陋与难用，所以但凡有点小想法的人都会做一个全新的日历。

制作日历的核心难点是填充日历。以下为我的填充日历函数：

void STCalandarWidget::FillCalandar(){    QDate firstDay;    firstDay.setDate(currentDate.year(), currentDate.month(), 1);    int firstnum = firstDay.dayOfWeek();//这个月的第一天是星期几    qDebug() << firstnum;    QDate firstDayOfMonth = firstDay.addDays(-(firstnum - 1));//日历的第一天实际的日期    for (int i = 0; i < 42; i++) {        if (i < firstnum-1 || (firstDayOfMonth.month() != currentDate.month())) {//理论上只需要后半边的条件就行            datewidgets[i]->SetDate(firstDayOfMonth.year(), firstDayOfMonth.month(), firstDayOfMonth.day(), false);        }        else {            datewidgets[i]->SetDate(firstDayOfMonth.year(), firstDayOfMonth.month(), firstDayOfMonth.day(), true);        }        firstDayOfMonth = firstDayOfMonth.addDays(1);    }}

鄙人制作的日历使用起来非常简单，仅需将两个头文件和两个CPP加入到工程中，使用时的代码如下：

  calandar_ = new STCalandarWidget(this);   connect(calandar_, SIGNAL(DateSelectSignal(QDate)), this, SLOT(HaveDateChose(QDate)));   calandar_->exec();

当日历的日期被选择时，会发送DateSelectSignal信号，调用者写一个槽函数接受一下就可以：

void MyClass::HaveDateChose(QDate c_dates){    ui.dateedit->setDate(c_dates);    calandar_->accepted();    calandar_->deleteLater();}

STDateWidget.h:

#pragma once#include <qwidget.h>#include <QDate>#include <QPainter>class STDateWidget :    public QWidget{    Q_OBJECTpublic:    enum Direction {        DIR_TOP = 0,        DIR_BOTTOM,        DIR_LEFT,        DIR_RIGHT    };     STDateWidget(QWidget* parrent = nullptr);    ~STDateWidget();    void SetDate(int year, int month, int day, bool isThisMonth);    QDate GetCurrentDate();    void AddNeighbor(STDateWidget* wid,Direction dir);    void HaveGoodNeighbor(Direction dir);    void DeleteGoodNgithbor(Direction dir);  private:    bool isHasGoodNeighbor;    bool canSelect;    bool isMoveIn;    Direction direction;    QDate currentDate;    QList<STDateWidget*> neighbors;    QList<Direction>directions;protected:    void mouseReleaseEvent(QMouseEvent* event) ;    void enterEvent(QEvent* event);    void leaveEvent(QEvent* event);    void paintEvent(QPaintEvent* event); signals:    void updateCurrentDate(QDate date);};

STDateWidget.cpp

#include "STDateWidget.h"#include <QMouseEvent>#include <QLinearGradient>STDateWidget::STDateWidget(QWidget* parrent ) :QWidget(parrent){    isMoveIn = false;    //qDebug() << "make";    //this->setGeometry(0, 0, 180, 160);    isHasGoodNeighbor = false;    //this->setStyleSheet("background-color:red");}STDateWidget::~STDateWidget(){} void STDateWidget::SetDate(int year, int month, int day, bool isThisMonth){    currentDate.setDate(year, month, day);    canSelect = isThisMonth;        update();} QDate STDateWidget::GetCurrentDate(){    return currentDate;} void STDateWidget::AddNeighbor(STDateWidget* wid, Direction dir){    neighbors.append(wid);    directions.append(dir);} void STDateWidget::HaveGoodNeighbor(Direction dir){    isHasGoodNeighbor = true;    direction = dir;    update();} void STDateWidget::DeleteGoodNgithbor(Direction dir){    isHasGoodNeighbor = false;    direction = dir;    update();} void STDateWidget::mouseReleaseEvent(QMouseEvent* event){    if (canSelect) {        emit updateCurrentDate(currentDate);    }    } void STDateWidget::enterEvent(QEvent* event){    isMoveIn = true;    for (int i = 0; i < neighbors.count(); i++) {        neighbors[i]->HaveGoodNeighbor(directions[i]);    }    update();} void STDateWidget::leaveEvent(QEvent* event){    isMoveIn = false;    for (int i = 0; i < neighbors.count(); i++) {        neighbors[i]->DeleteGoodNgithbor(directions[i]);    }    update();} void STDateWidget::paintEvent(QPaintEvent* event){    //return;    QPainter painter(this);    painter.save();    int xx = 1;    int yy = 1;    int ww = this->geometry().width();    int hh = this->geometry().height();    if (isMoveIn) {        QPen pen;        pen.setBrush(QColor(0, 200, 250, 200));        pen.setWidth(2);        painter.setPen(pen);        painter.drawRect(xx +2 ,yy +2,ww-4,hh-4);    }    else {        if (isHasGoodNeighbor)        {            QPen pen;            pen.setBrush(QColor(255, 255, 255, 0));            pen.setWidth(0);            painter.setPen(pen);            QLinearGradient line_left_top2bottom(xx + 2, yy + 2, xx + 2, yy + hh - 6);//左。            line_left_top2bottom.setColorAt(0.0, Qt::white);            line_left_top2bottom.setColorAt(1.0, QColor(0, 200, 250, 100));            QLinearGradient line_left_bottom2top( xx + 2, yy + hh - 6, xx + 2, yy + 2);//左。            line_left_bottom2top.setColorAt(0.0, Qt::white);            line_left_bottom2top.setColorAt(1.0, QColor(0, 200, 250, 100));            QLinearGradient line_right_top2bottpm(xx + ww - 6, yy + 2, xx + ww - 6, yy + hh - 6);            line_right_top2bottpm.setColorAt(0.0, Qt::white);            line_right_top2bottpm.setColorAt(1.0, QColor(0, 200, 250, 100));            QLinearGradient line_right_bottom2top(xx + ww - 6, yy + hh - 6, xx + ww - 6, yy + 2);            line_right_bottom2top.setColorAt(0.0, Qt::white);            line_right_bottom2top.setColorAt(1.0, QColor(0, 200, 250, 100));            QLinearGradient line_top_left2right(xx + 2, yy + 2, xx + ww - 6, yy + 2);            line_top_left2right.setColorAt(0.0, Qt::white);            line_top_left2right.setColorAt(1.0, QColor(0, 200, 250, 100));            QLinearGradient line_top_right2left(xx + ww - 6, yy + 2, xx + 2, yy + 2);            line_top_right2left.setColorAt(0.0, Qt::white);            line_top_right2left.setColorAt(1.0, QColor(0, 200, 250, 100));            QLinearGradient line_bottom_left2right(xx + 2, yy + hh - 6, xx + ww - 6, yy + hh - 6);            line_bottom_left2right.setColorAt(0.0, Qt::white);            line_bottom_left2right.setColorAt(1.0, QColor(0, 200, 250, 100));            QLinearGradient line_bottom_right2left(xx + ww - 6, yy + hh - 6, xx + 2, yy + hh - 6);            line_bottom_right2left.setColorAt(0.0, Qt::white);            line_bottom_right2left.setColorAt(1.0, QColor(0, 200, 250, 100));            QRect rectTop(xx + 2, yy + 2, ww - 6, 2);            QRect rectBottom(xx + 2, yy + hh - 4, ww - 4, 2);            QRect rectLeft(xx + 2, yy + 2, 2, hh - 6);            QRect rectRight(xx + ww - 4, yy + 2, 2, hh - 6);            switch (direction)            {            case STDateWidget::DIR_TOP:                painter.setBrush(QColor(0, 200, 250, 100));                painter.drawRect(rectBottom);                painter.setBrush(line_left_top2bottom);                painter.drawRect(rectLeft);                painter.setBrush(line_right_top2bottpm);                painter.drawRect(rectRight);                               break;            case STDateWidget::DIR_BOTTOM:                painter.setBrush(QColor(0, 200, 250, 100));                painter.drawRect(rectTop);                painter.setBrush(line_left_bottom2top);                painter.drawRect(rectLeft);                painter.setBrush(line_right_bottom2top);                painter.drawRect(rectRight);                break;            case STDateWidget::DIR_LEFT:                painter.setBrush(QColor(0, 200, 250, 100));                painter.drawRect(rectRight);                painter.setBrush(line_top_left2right);                painter.drawRect(rectTop);                painter.setBrush(line_bottom_left2right);                painter.drawRect(rectBottom);                break;            case STDateWidget::DIR_RIGHT:                painter.setBrush(QColor(0, 200, 250, 100));                painter.drawRect(rectLeft);                painter.setBrush(line_top_right2left);                painter.drawRect(rectTop);                painter.setBrush(line_bottom_right2left);                painter.drawRect(rectBottom);                break;            default:                break;            }        }            }    painter.restore();    if (canSelect) {        QPen pen2;        pen2.setBrush(QColor(0, 0, 0));        painter.setPen(pen2);        painter.drawText(ww/2 - 10, hh/2, QString::number(currentDate.day()));    }    else {        QPen pen2;        pen2.setBrush(QColor(200, 200, 200));        painter.setPen(pen2);        painter.drawText(ww/2- 10, hh/2, QString::number(currentDate.day()));    }    //painter}

STCalandarWidget.h

#pragma once#include <qdialog.h>#include "STDateWidget.h"#include <QLabel>#include <QPushButton>class STCalandarWidget :    public QDialog{    Q_OBJECTpublic:    STCalandarWidget(QWidget* parrent = nullptr);    ~STCalandarWidget();    void SetCurrentDate(int year, int month, int day);    QDate GetCurrentDate();private:    void FillCalandar();    void initLabels();    void initCalandar();    void init();    QString getFormatMonth();private:    QLabel *weeklabels[7];    STDateWidget *datewidgets[42];    QPushButton *lastYearButton;    QPushButton *lastMonthButton;    QPushButton *nextMonthButton;    QPushButton *nextYearButton;    QDate currentDate;    QLabel *cdlabel;public slots:    void HaveDateSelect(QDate date);    void JumpLastYear();    void JumpLastMonth();    void JumpNextMonth();    void JumpNextYear(); signals:    void DateSelectSignal(QDate date);};

STCalandarWidget.cpp:

#include "STCalandarWidget.h"#include <QDebug>STCalandarWidget::STCalandarWidget(QWidget* parrent ) :QDialog(parrent) {    this->setStyleSheet(QString::fromLocal8Bit("font:15px 等线; background-color:rgb(250,250,250)"));    this->setMinimumSize(580, 450);    this->setMaximumSize(580, 450);    Qt::WindowFlags flags = Qt::Dialog;    flags |= Qt::WindowCloseButtonHint;    setWindowFlags(flags);    init();} STCalandarWidget::~STCalandarWidget(){} void STCalandarWidget::SetCurrentDate(int year, int month, int day){    currentDate.setDate(year, month, day);} QDate STCalandarWidget::GetCurrentDate(){    return currentDate;} void STCalandarWidget::FillCalandar(){    QDate firstDay;    firstDay.setDate(currentDate.year(), currentDate.month(), 1);    int firstnum = firstDay.dayOfWeek();    qDebug() << firstnum;    QDate firstDayOfMonth = firstDay.addDays(-(firstnum - 1));    for (int i = 0; i < 42; i++) {        if (i < firstnum-1 || (firstDayOfMonth.month() != currentDate.month())) {            datewidgets[i]->SetDate(firstDayOfMonth.year(), firstDayOfMonth.month(), firstDayOfMonth.day(), false);        }        else {            datewidgets[i]->SetDate(firstDayOfMonth.year(), firstDayOfMonth.month(), firstDayOfMonth.day(), true);        }        firstDayOfMonth = firstDayOfMonth.addDays(1);    }} void STCalandarWidget::initLabels(){    for (int i = 0; i < 7; i++) {        weeklabels[i] = new QLabel(this);        weeklabels[i]->setGeometry(35 + i*80, 50, 80, 40);    }    weeklabels[0]->setText("Mon");    weeklabels[1]->setText("Tue");    weeklabels[2]->setText("Wed");    weeklabels[3]->setText("Thu");    weeklabels[4]->setText("Fri");    weeklabels[5]->setText("Sat");    weeklabels[6]->setText("Sun");} void STCalandarWidget::initCalandar(){    for (int i = 0; i < 42; i++) {        datewidgets[i] = new STDateWidget(this);        datewidgets[i]->setGeometry(10 + i % 7 * 80, 80 + i / 7 * 60, 80, 60);        connect(datewidgets[i], SIGNAL(updateCurrentDate(QDate)), this, SLOT(HaveDateSelect(QDate)));    }    for (int i = 0; i < 42; i++) {        if (i / 7 == 0 ) {//第一排            if (i % 7 == 0) {//第一个                datewidgets[i]->AddNeighbor(datewidgets[i + 1], STDateWidget::DIR_RIGHT);            }            else if (i % 7 == 6) {//最后一个                datewidgets[i]->AddNeighbor(datewidgets[i - 1], STDateWidget::DIR_LEFT);            }            else {                datewidgets[i]->AddNeighbor(datewidgets[i + 1], STDateWidget::DIR_RIGHT);                datewidgets[i]->AddNeighbor(datewidgets[i - 1], STDateWidget::DIR_LEFT);            }            datewidgets[i]->AddNeighbor(datewidgets[i + 7], STDateWidget::DIR_BOTTOM);        }        else if (i / 7 == 5) {//最后一排            if (i % 7 == 0) {//第一个                datewidgets[i]->AddNeighbor(datewidgets[i + 1], STDateWidget::DIR_RIGHT);            }            else if (i % 7 == 6) {//最后一个                datewidgets[i]->AddNeighbor(datewidgets[i - 1], STDateWidget::DIR_LEFT);            }            else {                datewidgets[i]->AddNeighbor(datewidgets[i + 1], STDateWidget::DIR_RIGHT);                datewidgets[i]->AddNeighbor(datewidgets[i - 1], STDateWidget::DIR_LEFT);            }            datewidgets[i]->AddNeighbor(datewidgets[i - 7], STDateWidget::DIR_TOP);        }        else        {            if (i % 7 == 0) {//第一个                datewidgets[i]->AddNeighbor(datewidgets[i + 1], STDateWidget::DIR_RIGHT);            }            else if (i % 7 == 6) {//最后一个                datewidgets[i]->AddNeighbor(datewidgets[i - 1], STDateWidget::DIR_LEFT);            }            else {                datewidgets[i]->AddNeighbor(datewidgets[i + 1], STDateWidget::DIR_RIGHT);                datewidgets[i]->AddNeighbor(datewidgets[i - 1], STDateWidget::DIR_LEFT);            }            datewidgets[i]->AddNeighbor(datewidgets[i - 7], STDateWidget::DIR_TOP);            datewidgets[i]->AddNeighbor(datewidgets[i + 7], STDateWidget::DIR_BOTTOM);        }    }    FillCalandar();} void STCalandarWidget::init(){    currentDate = QDate::currentDate();    lastYearButton = new QPushButton(this);    lastYearButton->setGeometry(10, 10, 100, 30);    lastYearButton->setText("<<");     lastMonthButton = new QPushButton(this);    lastMonthButton->setGeometry(120, 10, 100, 30);    lastMonthButton->setText("<");     cdlabel = new QLabel(this);    cdlabel->setGeometry(255, 10, 100, 40);    cdlabel->setText(getFormatMonth());     nextMonthButton = new QPushButton(this);    nextMonthButton->setGeometry(360, 10, 100, 30);    nextMonthButton->setText(">");     nextYearButton = new QPushButton(this);    nextYearButton->setGeometry(470, 10, 100, 30);    nextYearButton->setText(">>");     connect(lastYearButton, SIGNAL(clicked()), this, SLOT(JumpLastYear()));    connect(lastMonthButton, SIGNAL(clicked()), this, SLOT(JumpLastMonth()));    connect(nextMonthButton, SIGNAL(clicked()), this, SLOT(JumpNextMonth()));    connect(nextYearButton, SIGNAL(clicked()), this, SLOT(JumpNextYear()));    initLabels();    initCalandar();}QString STCalandarWidget::getFormatMonth(){    QString ans = "";    ans += QString::number(currentDate.year());    ans += QString::fromLocal8Bit("年");    ans += QString::number(currentDate.month());    ans += QString::fromLocal8Bit("月");    return ans;}void STCalandarWidget::HaveDateSelect(QDate date){    qDebug() << date;    emit DateSelectSignal(date);}void STCalandarWidget::JumpLastYear(){    currentDate = currentDate.addYears(-1);    FillCalandar();    cdlabel->setText(getFormatMonth());} void STCalandarWidget::JumpLastMonth(){    currentDate = currentDate.addMonths(-1);    FillCalandar();    cdlabel->setText(getFormatMonth());} void STCalandarWidget::JumpNextMonth(){    currentDate = currentDate.addMonths(1);    FillCalandar();    cdlabel->setText(getFormatMonth());} void STCalandarWidget::JumpNextYear(){    currentDate = currentDate.addYears(1);    FillCalandar();    cdlabel->setText(getFormatMonth());}

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