Qt实现QListView自定义Item界面——仿QQ好友界面
来源:互联网 发布:2017淘宝装修教程 编辑:程序博客网 时间:2024/05/22 14:45
一直都认为,用最通俗的语言,讲解最深刻的技术,是每一个技术交流者应该考虑的事情,今天朋友问我,好友列表该怎么实现。我想起之前上网查阅的时候,发现网上介绍这块的内容甚少,而且讲解的不够好,于是,本着互相交流的精神,在这里讲解一下我是怎么实现QQ好友列表的。
1、Q:关于好友列表到底是QTreeWidget/QTreeView还是QListWidget/QListView的问题?
A:相信大家初次一看,大部分都认为是QTreeWidget,其实是用QListWidget或者QListView均可简单实现,在数据多的时候,QListWidget性能会降低,不过,对于好友列表来说,QListWidget足以,并且更加简单。所以,我继承的是QListWidget来实现。
2、Q:关于如何实现一个Item具有多种信息,包括头像、用户名、个性签名等?
A:该Item其实是一个继承了QWidget的自定义buddy类,把你所想要的信息全部在该buddy类里面布局好,甚至可以加进按钮,自定义的好处就在于,你想到什么,就能干什么,然后在QListWiget里面里通过实现
- QListWidgetItem *newItem = new QListWidgetItem();
- this->insertItem(row(currentItem)+tem.count(),newItem);
- this->setItemWidget(newItem, buddy);
即可。
3、Q:关于如何实现好友的展开与隐藏?
A:这部分里我设置了两个容器:
- QMap<QListWidgetItem*,QListWidgetItem*> groupMap;
- QMap<QListWidgetItem*,bool> isHideMap;
其中,groupMap用来存放key为项,value为组的数据,比如我增加了一个“我的好友”的组,则存进去是key:我的好友,value:我的好友;接着,在isHideMap存放key:我的好友,value:false,表示默认该组是未展开的;紧接着,如果在“我的好友”里,我增加了一个好友“逍遥圣帝”,则存进去的是:key:逍遥圣帝,value:我的好友,这样处理的关键是为了保存好组与好友的关系;最后再利用isHideMap来判断组的状态,如果是隐藏,则通过遍历groupMap里面的好友,使之显示,否则,反之。4、Q:关于如何实现美化效果?
A:直接用QSS就可以了。
下面直接贴出源代码,我已经在源代码里面详细给每一个关键步骤进行了说明,所以就不进行阐述了,相信大家看得懂的,如有不懂可以追加评论,第一时间回复你们,下面是实现一个QQ好友列表的简单功能,对于其他功能大家好好拓展即可~~
一、首先是实现具有各种信息的Buddy类:
personListBuddy.h
- #ifndef PERSONLISTBUDDY_H
- #define PERSONLISTBUDDY_H
- #include <QWidget>
- #include <QLabel>
- #include <QEvent>
-
- class personListBuddy : public QWidget
- {
- Q_OBJECT
- public:
- explicit personListBuddy(QWidget *parent = 0);
- void initUi();
- QWidget *head;
- QLabel *name;
- QLabel *sign;
- QString headPath;
- bool eventFilter(QObject *obj, QEvent *event);
-
- signals:
-
- public slots:
-
- };
- #endif // PERSONLISTBUDDY_H
personListBuddy.cpp
- #include "personlistbuddy.h"
- #include <QPainter>
- personListBuddy::personListBuddy(QWidget *parent) :
- QWidget(parent)
- {
- initUi();
- }
-
- void personListBuddy::initUi()
- {
-
- head=new QWidget(this);
- name=new QLabel(this);
- sign=new QLabel(this);
-
- head->setFixedSize(40,40);
-
- QPalette color;
- color.setColor(QPalette::Text,Qt::gray);
- sign->setPalette(color);
-
- head->move(7,7);
- name->move(54,10);
- sign->move(54,27);
-
- head->installEventFilter(this);
- }
-
- bool personListBuddy::eventFilter(QObject *obj, QEvent *event)
- {
- if(obj == head)
- {
- if(event->type() == QEvent::Paint)
- {
- QPainter painter(head);
- painter.drawPixmap(head->rect(), QPixmap(headPath));
- }
- }
- return QWidget::eventFilter(obj, event);
- }
二、实现好友列表personList类:
personList.h
- #ifndef PERSONLIST_H
- #define PERSONLIST_H
- #include <QListWidget>
- #include <QMenu>
- #include <QMouseEvent>
- #include <QLineEdit>
-
- class personList : public QListWidget
- {
- Q_OBJECT
- public:
- explicit personList(QListWidget *parent = 0);
- void mousePressEvent(QMouseEvent *event);
- void contextMenuEvent(QContextMenuEvent*);
- void initMenu();
- QMenu *blankMenu;
- QMenu *groupMenu;
- QMenu *personMenu;
- QMap<QListWidgetItem*,QListWidgetItem*> groupMap;
- QMap<QListWidgetItem*,bool> isHideMap;
- QLineEdit *groupNameEdit;
- QListWidgetItem *currentItem;
-
- signals:
-
- public slots:
- void slotAddGroup();
- void slotDelGroup();
- void slotAddBuddy();
- void slotDelBuddy();
- void slotRename();
- void slotRenameEditFshed();
-
- };
- #endif // PERSONLIST_H
personList.cpp
- #include "personlist.h"
- #include <QAction>
- #include <QIcon>
- #include "personlistbuddy.h"
- personList::personList(QListWidget *parent) :
- QListWidget(parent)
- {
- setFocusPolicy(Qt::NoFocus);
- setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
- initMenu();
- }
-
- void personList::initMenu()
- {
-
- blankMenu = new QMenu();
- groupMenu = new QMenu();
- personMenu = new QMenu();
- groupNameEdit=new QLineEdit();
- QAction *addGroup = new QAction("添加分组", this);
- QAction *delGroup = new QAction("删除该组", this);
- QAction *rename = new QAction("重命名", this);
- QAction *addBuddy = new QAction("添加好友",this);
- QAction *delBuddy = new QAction("删除好友", this);
-
- groupNameEdit->setParent(this);
- groupNameEdit->hide();
- groupNameEdit->setPlaceholderText("未命名");
-
- blankMenu->addAction(addGroup);
- groupMenu->addAction(delGroup);
- groupMenu->addAction(rename);
- groupMenu->addAction(addBuddy);
- personMenu->addAction(delBuddy);
-
- connect(groupNameEdit,SIGNAL(editingFinished()),this,SLOT(slotRenameEditFshed()));
- connect(addGroup,SIGNAL(triggered()),this,SLOT(slotAddGroup()));
- connect(delGroup,SIGNAL(triggered()),this,SLOT(slotDelGroup()));
- connect(rename,SIGNAL(triggered()),this,SLOT(slotRename()));
- connect(addBuddy,SIGNAL(triggered()),this,SLOT(slotAddBuddy()));
- connect(delBuddy,SIGNAL(triggered()),this,SLOT(slotDelBuddy()));
- }
-
- void personList::mousePressEvent(QMouseEvent *event)
- {
- QListWidget::mousePressEvent(event);
-
- if(groupNameEdit->isVisible() && !(groupNameEdit->rect().contains(event->pos())))
- {
- if(groupNameEdit->text()!=NULL)
- currentItem->setText(groupNameEdit->text());
- groupNameEdit->setText("");
- groupNameEdit->hide();
- }
- currentItem = this->itemAt(mapFromGlobal(QCursor::pos()));
- if(event->button()==Qt::LeftButton && currentItem!=NULL && currentItem==groupMap.value(currentItem))
- {
- if(isHideMap.value(currentItem))
- {
- foreach(QListWidgetItem* subItem, groupMap.keys(currentItem))
- if(subItem!=currentItem)
- {
- subItem->setHidden(false);
- }
- isHideMap.insert(currentItem,false);
- currentItem->setIcon(QIcon(":/arrowDown"));
- }
- else
- {
- foreach(QListWidgetItem* subItem, groupMap.keys(currentItem))
- if(subItem!=currentItem)
- {
- subItem->setHidden(true);
- }
- isHideMap.insert(currentItem,true);
- currentItem->setIcon(QIcon(":/arrowRight"));
- }
- }
- }
-
- void personList::contextMenuEvent(QContextMenuEvent *event)
- {
- QListWidget::contextMenuEvent(event);
- if(currentItem==NULL)
- {
- blankMenu->exec(QCursor::pos());
- return;
- }
- if(currentItem==groupMap.value(currentItem))
- groupMenu->exec(QCursor::pos());
- else
- personMenu->exec(QCursor::pos());
- }
-
- void personList::slotAddGroup()
- {
- QListWidgetItem *newItem=new QListWidgetItem(QIcon(":/arrowRight"),"未命名");
- newItem->setSizeHint(QSize(this->width(),25));
- this->addItem(newItem);
- groupMap.insert(newItem,newItem);
- isHideMap.insert(newItem,true);
- groupNameEdit->raise();
- groupNameEdit->setText(tr("未命名"));
- groupNameEdit->selectAll();
- groupNameEdit->setGeometry(this->visualItemRect(newItem).left()+15,this->visualItemRect(newItem).top()+1,this->visualItemRect(newItem).width(),this->visualItemRect(newItem).height()-2);
- groupNameEdit->show();
- groupNameEdit->setFocus();
- currentItem = newItem;
- }
-
- void personList::slotDelGroup()
- {
- foreach(QListWidgetItem* item, groupMap.keys(currentItem))
- {
- groupMap.remove(item);
- delete item;
- }
- isHideMap.remove(currentItem);
- }
-
- void personList::slotRename()
- {
- groupNameEdit->raise();
- groupNameEdit->setGeometry(this->visualItemRect(currentItem).left()+15,this->visualItemRect(currentItem).top()+1,this->visualItemRect(currentItem).width(),this->visualItemRect(currentItem).height()-2);
- groupNameEdit->setText(currentItem->text());
- groupNameEdit->show();
- groupNameEdit->selectAll();
- groupNameEdit->setFocus();
- }
-
- void personList::slotAddBuddy()
- {
- personListBuddy *buddy=new personListBuddy();
- buddy->headPath=":/head";
- buddy->name->setText("逍遥圣帝");
- buddy->sign->setText("用通俗的语言,讲深刻的技术。");
- QList<QListWidgetItem*> tem = groupMap.keys(currentItem);
-
- QListWidgetItem *newItem = new QListWidgetItem();
- this->insertItem(row(currentItem)+tem.count(),newItem);
- this->setItemWidget(newItem, buddy);
- groupMap.insert(newItem,currentItem);
- if(isHideMap.value(currentItem))
- newItem->setHidden(true);
- else
- newItem->setHidden(false);
- }
-
- void personList::slotDelBuddy()
- {
- groupMap.remove(currentItem);
- delete currentItem;
- }
-
- void personList::slotRenameEditFshed()
- {
- if(groupNameEdit->text()!=NULL)
- currentItem->setText(groupNameEdit->text());
- groupNameEdit->setText("");
- groupNameEdit->hide();
- }
三、美化用到的QSS:
- QListWidget{
- background:white;
- color:black;
- border:none;
- }
-
- QListWidget::item{
- border:none;
- height: 54px;
- }
-
- QListWidget::item:hover{
- background:rgb(252,240,193)
- }
-
- QListWidget::item:selected{
- background:rgb(252,233,161);
- color:black;
- }
-
- QScrollBar:vertical {
- background:transparent;
- width:9px;
- margin: 0px 0px 2px 0px;
- }
-
- QScrollBar::handle:vertical {
- background: rgb(195, 195, 195);
- min-height: 20px;
- border-radius: 3px;
- }
-
- QScrollBar::handle:vertical:hover{
- background:rgba(0,0,0,30%);
- }
-
- QScrollBar::add-line:vertical {
- height: 0px;
- subcontrol-position: bottom;
- subcontrol-origin: margin;
- }
-
- QScrollBar::sub-line:vertical {
- height: 0px;
- subcontrol-position: top;
- subcontrol-origin: margin;
- }
四、用到的素材:
五、效果图: