注:Model/View架構使用要繼承QStyledItemDelegate 類,類型選擇爲Widget;
數據項中:Item;
每個Item可以關聯多個數據,每個數據用一個role(角色,任務)來作爲標識;
Qt:Display Role(0):一般對應一個字符串,用於顯示。
Qt:User Role(32)自定義數據;
Model/View框架的核心思想是模型(數據)與視圖(顯示)相分離,模型對外提供標準接口存取數據,不關心數據如何顯示,視圖自定義數據的顯示方式,不關心數據如何組織存儲。
Model/View框架中數據與顯示的分離,可以允許使用不同界面顯示同一數據,也能夠在不改變數據的情況下添加新的顯示界面。爲了處理用戶輸入,引入了委託(delegate)。引入委託的好處是可以自定義數據項的渲染和編輯。
頭文件:
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QString>
#include <QListWidget>
#include <QListWidgetItem>
#include "myitemdrawer.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public:
void Additem(QString name,QString phone,bool male);
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
myitemdrawer.h(繼承QStyledItemDelegate 類,類型選擇爲Widget)
#ifndef MYITEMDRAWER_H
#define MYITEMDRAWER_H
#include <QStyledItemDelegate>
#include <QRect>
#include <QPainter>
#include <QSize>
#include <QIcon>
#include <QPixmap>
class MyItemDrawer : public QStyledItemDelegate
{
Q_OBJECT
public:
explicit MyItemDrawer(QObject *parent = 0);
public:
//單元格的大小設置
QSize sizeHint(const QStyleOptionViewItem &option,
const QModelIndex &index) const;
//繪圖
void paint(QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const;
signals:
public slots:
private:
QPixmap m_man,m_woman;
};
#endif // MYITEMDRAWER_H
源文件:main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
mainwindow.cpp#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
Additem("小芳","18390274819",false);
Additem("小薇","18789057193",false);
Additem("小強","137182904672",true);
Additem("小剛","17890367839",true);
//使用自定義的代理繪圖
ui->listWidget->setItemDelegate(new MyItemDrawer(ui->listWidget));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::Additem(QString name, QString phone, bool male)
{
QListWidgetItem *item = new QListWidgetItem;
item->setData(Qt::DisplayRole,name);
item->setData(Qt::UserRole,phone);
item->setData(Qt::UserRole+1,male);
ui->listWidget->addItem(item);
}
myitemdrawer.cpp#include "myitemdrawer.h"
MyItemDrawer::MyItemDrawer(QObject *parent) :
QStyledItemDelegate(parent),
m_man("D:/QT_Library/Model_Vile_LianXi/icon/man.png"),
m_woman("D:/QT_Library/Model_Vile_LianXi/icon/woman.png")
{
}
QSize MyItemDrawer::sizeHint(const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QSize size = QStyledItemDelegate::sizeHint(option,index);
size.setHeight(40);
return size;
}
void MyItemDrawer::paint(QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QRect rect = option.rect; //目標矩形
rect.adjust(2,2,-2,-2); //調整大小,留出空白區
// 取得代理項對應的數據
QString name = index.data(Qt::DisplayRole).toString();
QString phone = index.data(Qt::UserRole).toString();
bool male = index.data(Qt::UserRole+1).toBool();
// 該項被選中時的狀態顯示
if(option.state & QStyle::State_Selected)
{
painter->setBrush(QColor(0xCC,0xAA,0xAA));
painter->drawRoundedRect(rect,2,2);
}
//性別顯示
if(1)
{
QRect dest = rect;
dest.setRight(rect.left()+40);
QRect area(0,0,24,24);
area.moveCenter(dest.center());
painter->drawPixmap(area,male?m_man:m_woman);
}
//名稱顯示
if(1)
{
QRect dest = rect;
dest.setLeft(rect.left()+40);
dest.setBottom(rect.top()+20);
painter->drawText(dest,Qt::AlignLeft | Qt::AlignVCenter,name);
}
//phone顯示
if(1)
{
QRect dest = rect;
dest.setLeft(rect.left() +40);
dest.setTop(rect.top()+20);
painter->drawText(dest,Qt::AlignLeft | Qt::AlignVCenter,phone);
}
}
界面設計:(ListWidget)
運行效果: