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qt 气泡聊天界面_微信聊天气泡框素材

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qt 气泡聊天界面_微信聊天气泡框素材目录由于最近的项目需要，做了些相关IM的工作。所以聊天框也是必不可少的一部分。聊天框的制作分很多种，本文以QListWidget+QPainter绘制的Item做了一个Demo。该Demo只是做一个示例，代码已公布如下，需要的拿去！目录效果图实现原理调用样例实现类代码分享效果图实现原理气泡式聊天的显示是由QListWidget作为控件，每个…

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文章目录

1、简介

由于最近的项目需要，做了些相关IM的工作。所以聊天框也是必不可少的一部分。聊天框的制作分很多种，本文以QListWidget+QPainter绘制的Item做了一个Demo。该Demo只是做一个示例，代码已公布如下，需要的拿去！

2、效果图

这里写图片描述

3、实现原理

气泡式聊天的显示是由QListWidget作为控件，每个气泡是由QListWidgetItem提升成QWidget来实现的。每个气泡可以理解位是一个QWidget，这样可以自由布置QWidget里面的内容。每个Item保存聊天的对话、发送状态、时间、种类等。

这个QWidget主要是显示一个头像+气泡，气泡里面是聊天的内容等。
气泡是在paintEvent事件中，采用QPainter来绘制的。

4、核心代码

4.1、头文件

#ifndef QNCHATMESSAGE_H
#define QNCHATMESSAGE_H

#include <QWidget>

class QPaintEvent;
class QPainter;
class QLabel;
class QMovie;

class QNChatMessage : public QWidget
{ 
   
    Q_OBJECT
public:
    explicit QNChatMessage(QWidget *parent = nullptr);

    enum User_Type{ 
   
        User_System,//系统
        User_Me,    //自己
        User_She,   //用户
        User_Time,  //时间
    };
    void setTextSuccess();
    void setText(QString text, QString time, QSize allSize, User_Type userType);

    QSize getRealString(QString src);
    QSize fontRect(QString str);

    inline QString text() { 
   return m_msg;}
    inline QString time() { 
   return m_time;}
    inline User_Type userType() { 
   return m_userType;}
protected:
    void paintEvent(QPaintEvent *event);
private:
    QString m_msg;
    QString m_time;
    QString m_curTime;

    QSize m_allSize;
    User_Type m_userType = User_System;

    int m_kuangWidth;
    int m_textWidth;
    int m_spaceWid;
    int m_lineHeight;

    QRect m_iconLeftRect;
    QRect m_iconRightRect;
    QRect m_sanjiaoLeftRect;
    QRect m_sanjiaoRightRect;
    QRect m_kuangLeftRect;
    QRect m_kuangRightRect;
    QRect m_textLeftRect;
    QRect m_textRightRect;
    QPixmap m_leftPixmap;
    QPixmap m_rightPixmap;
    QLabel* m_loading = Q_NULLPTR;
    QMovie* m_loadingMovie = Q_NULLPTR;
    bool m_isSending = false;
};

#endif // QNCHATMESSAGE_H

4.2、源文件

#include "qnchatmessage.h"
#include <QFontMetrics>
#include <QPaintEvent>
#include <QDateTime>
#include <QPainter>
#include <QMovie>
#include <QLabel>
#include <QDebug>

QNChatMessage::QNChatMessage(QWidget *parent) : QWidget(parent)
{ 
   
    QFont te_font = this->font();
    te_font.setFamily("MicrosoftYaHei");
    te_font.setPointSize(12);
// te_font.setWordSpacing(0);
// te_font.setLetterSpacing(QFont::PercentageSpacing,0);
// te_font.setLetterSpacing(QFont::PercentageSpacing, 100); //300%,100为默认 //设置字间距%
// te_font.setLetterSpacing(QFont::AbsoluteSpacing, 0); //设置字间距为3像素 //设置字间距像素值
    this->setFont(te_font);
    m_leftPixmap = QPixmap(":/img/Customer Copy.png");
    m_rightPixmap = QPixmap(":/img/CustomerService.png");

    m_loadingMovie = new QMovie(this);
    m_loadingMovie->setFileName(":/img/loading4.gif");
    m_loading = new QLabel(this);
    m_loading->setMovie(m_loadingMovie);
    m_loading->resize(16,16);
    m_loading->setAttribute(Qt::WA_TranslucentBackground , true);
    m_loading->setAutoFillBackground(false);
}

void QNChatMessage::setTextSuccess()
{ 
   
    m_loading->hide();
    m_loadingMovie->stop();
    m_isSending = true;
}

void QNChatMessage::setText(QString text, QString time, QSize allSize, QNChatMessage::User_Type userType)
{ 
   
    m_msg = text;
    m_userType = userType;
    m_time = time;
    m_curTime = QDateTime::fromTime_t(time.toInt()).toString("hh:mm");
    m_allSize = allSize;
    if(userType == User_Me) { 
   
        if(!m_isSending) { 
   
            m_loading->move(m_kuangRightRect.x() - m_loading->width() - 10, m_kuangRightRect.y()+m_kuangRightRect.height()/2- m_loading->height()/2);
            m_loading->show();
            m_loadingMovie->start();
        }
    } else { 
   
        m_loading->hide();
    }

    this->update();
}

QSize QNChatMessage::fontRect(QString str)
{ 
   
    m_msg = str;
    int minHei = 30;
    int iconWH = 40;
    int iconSpaceW = 20;
    int iconRectW = 5;
    int iconTMPH = 10;
    int sanJiaoW = 6;
    int kuangTMP = 20;
    int textSpaceRect = 12;
    m_kuangWidth = this->width() - kuangTMP - 2*(iconWH+iconSpaceW+iconRectW);
    m_textWidth = m_kuangWidth - 2*textSpaceRect;
    m_spaceWid = this->width() - m_textWidth;
    m_iconLeftRect = QRect(iconSpaceW, iconTMPH, iconWH, iconWH);
    m_iconRightRect = QRect(this->width() - iconSpaceW - iconWH, iconTMPH, iconWH, iconWH);

    QSize size = getRealString(m_msg); // 整个的size

    qDebug() << "fontRect Size:" << size;
    int hei = size.height() < minHei ? minHei : size.height();

    m_sanjiaoLeftRect = QRect(iconWH+iconSpaceW+iconRectW, m_lineHeight/2, sanJiaoW, hei - m_lineHeight);
    m_sanjiaoRightRect = QRect(this->width() - iconRectW - iconWH - iconSpaceW - sanJiaoW, m_lineHeight/2, sanJiaoW, hei - m_lineHeight);

    if(size.width() < (m_textWidth+m_spaceWid)) { 
   
        m_kuangLeftRect.setRect(m_sanjiaoLeftRect.x()+m_sanjiaoLeftRect.width(), m_lineHeight/4*3, size.width()-m_spaceWid+2*textSpaceRect, hei-m_lineHeight);
        m_kuangRightRect.setRect(this->width() - size.width() + m_spaceWid - 2*textSpaceRect - iconWH - iconSpaceW - iconRectW - sanJiaoW,
                                 m_lineHeight/4*3, size.width()-m_spaceWid+2*textSpaceRect, hei-m_lineHeight);
    } else { 
   
        m_kuangLeftRect.setRect(m_sanjiaoLeftRect.x()+m_sanjiaoLeftRect.width(), m_lineHeight/4*3, m_kuangWidth, hei-m_lineHeight);
        m_kuangRightRect.setRect(iconWH + kuangTMP + iconSpaceW + iconRectW - sanJiaoW, m_lineHeight/4*3, m_kuangWidth, hei-m_lineHeight);
    }
    m_textLeftRect.setRect(m_kuangLeftRect.x()+textSpaceRect,m_kuangLeftRect.y()+iconTMPH,
                           m_kuangLeftRect.width()-2*textSpaceRect,m_kuangLeftRect.height()-2*iconTMPH);
    m_textRightRect.setRect(m_kuangRightRect.x()+textSpaceRect,m_kuangRightRect.y()+iconTMPH,
                            m_kuangRightRect.width()-2*textSpaceRect,m_kuangRightRect.height()-2*iconTMPH);

    return QSize(size.width(), hei);
}

QSize QNChatMessage::getRealString(QString src)
{ 
   
    QFontMetricsF fm(this->font());
    m_lineHeight = fm.lineSpacing();
    int nCount = src.count("\n");
    int nMaxWidth = 0;
    if(nCount == 0) { 
   
        nMaxWidth = fm.width(src);
        QString value = src;
        if(nMaxWidth > m_textWidth) { 
   
            nMaxWidth = m_textWidth;
            int size = m_textWidth / fm.width(" ");
            int num = fm.width(value) / m_textWidth;
            int ttmp = num*fm.width(" ");
            num = ( fm.width(value) ) / m_textWidth;
            nCount += num;
            QString temp = "";
            for(int i = 0; i < num; i++) { 
   
                temp += value.mid(i*size, (i+1)*size) + "\n";
            }
            src.replace(value, temp);
        }
    } else { 
   
        for(int i = 0; i < (nCount + 1); i++) { 
   
            QString value = src.split("\n").at(i);
            nMaxWidth = fm.width(value) > nMaxWidth ? fm.width(value) : nMaxWidth;
            if(fm.width(value) > m_textWidth) { 
   
                nMaxWidth = m_textWidth;
                int size = m_textWidth / fm.width(" ");
                int num = fm.width(value) / m_textWidth;
                num = ((i+num)*fm.width(" ") + fm.width(value)) / m_textWidth;
                nCount += num;
                QString temp = "";
                for(int i = 0; i < num; i++) { 
   
                    temp += value.mid(i*size, (i+1)*size) + "\n";
                }
                src.replace(value, temp);
            }
        }
    }
    return QSize(nMaxWidth+m_spaceWid, (nCount + 1) * m_lineHeight+2*m_lineHeight);
}

void QNChatMessage::paintEvent(QPaintEvent *event)
{ 
   
    Q_UNUSED(event);

    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);//消锯齿
    painter.setPen(Qt::NoPen);
    painter.setBrush(QBrush(Qt::gray));

    if(m_userType == User_Type::User_She) { 
    // 用户
        //头像
// painter.drawRoundedRect(m_iconLeftRect,m_iconLeftRect.width(),m_iconLeftRect.height());
        painter.drawPixmap(m_iconLeftRect, m_leftPixmap);

        //框加边
        QColor col_KuangB(234, 234, 234);
        painter.setBrush(QBrush(col_KuangB));
        painter.drawRoundedRect(m_kuangLeftRect.x()-1,m_kuangLeftRect.y()-1,m_kuangLeftRect.width()+2,m_kuangLeftRect.height()+2,4,4);
        //框
        QColor col_Kuang(255,255,255);
        painter.setBrush(QBrush(col_Kuang));
        painter.drawRoundedRect(m_kuangLeftRect,4,4);

        //三角
        QPointF points[3] = { 
   
            QPointF(m_sanjiaoLeftRect.x(), 30),
            QPointF(m_sanjiaoLeftRect.x()+m_sanjiaoLeftRect.width(), 25),
            QPointF(m_sanjiaoLeftRect.x()+m_sanjiaoLeftRect.width(), 35),
        };
        QPen pen;
        pen.setColor(col_Kuang);
        painter.setPen(pen);
        painter.drawPolygon(points, 3);

        //三角加边
        QPen penSanJiaoBian;
        penSanJiaoBian.setColor(col_KuangB);
        painter.setPen(penSanJiaoBian);
        painter.drawLine(QPointF(m_sanjiaoLeftRect.x() - 1, 30), QPointF(m_sanjiaoLeftRect.x()+m_sanjiaoLeftRect.width(), 24));
        painter.drawLine(QPointF(m_sanjiaoLeftRect.x() - 1, 30), QPointF(m_sanjiaoLeftRect.x()+m_sanjiaoLeftRect.width(), 36));

        //内容
        QPen penText;
        penText.setColor(QColor(51,51,51));
        painter.setPen(penText);
        QTextOption option(Qt::AlignLeft | Qt::AlignVCenter);
        option.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
        painter.setFont(this->font());
        painter.drawText(m_textLeftRect, m_msg,option);
    }  else if(m_userType == User_Type::User_Me) { 
    // 自己
        //头像
// painter.drawRoundedRect(m_iconRightRect,m_iconRightRect.width(),m_iconRightRect.height());
        painter.drawPixmap(m_iconRightRect, m_rightPixmap);

        //框
        QColor col_Kuang(75,164,242);
        painter.setBrush(QBrush(col_Kuang));
        painter.drawRoundedRect(m_kuangRightRect,4,4);

        //三角
        QPointF points[3] = { 
   
            QPointF(m_sanjiaoRightRect.x()+m_sanjiaoRightRect.width(), 30),
            QPointF(m_sanjiaoRightRect.x(), 25),
            QPointF(m_sanjiaoRightRect.x(), 35),
        };
        QPen pen;
        pen.setColor(col_Kuang);
        painter.setPen(pen);
        painter.drawPolygon(points, 3);

        //内容
        QPen penText;
        penText.setColor(Qt::white);
        painter.setPen(penText);
        QTextOption option(Qt::AlignLeft | Qt::AlignVCenter);
        option.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
        painter.setFont(this->font());
        painter.drawText(m_textRightRect,m_msg,option);
    }  else if(m_userType == User_Type::User_Time) { 
    // 时间
        QPen penText;
        penText.setColor(QColor(153,153,153));
        painter.setPen(penText);
        QTextOption option(Qt::AlignCenter);
        option.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
        QFont te_font = this->font();
        te_font.setFamily("MicrosoftYaHei");
        te_font.setPointSize(10);
        painter.setFont(te_font);
        painter.drawText(this->rect(),m_curTime,option);
    }
}

5、代码分享

5.1、Github

地址：https://github.com/ShaShiDiZhuanLan/Demo_MessageChat_Qt

5.2、码云

地址：https://gitee.com/ShaShiDiZhuanLan/Demo_MessageChat

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