C++ 分组QCOMBOX
你能给我一个简单的例子说明如何在Qt中创建这个组合框吗C++ 分组QCOMBOX,c++,qt,qcombobox,C++,Qt,Qcombobox,你能给我一个简单的例子说明如何在Qt中创建这个组合框吗 您可以在此处找到如何执行此操作的说明: 其思想是添加父项和子项,然后在自定义委托的帮助下对它们进行不同的绘制 也就是说,你设置了 item->setData( "parent", Qt::AccessibleDescriptionRole ); 添加组和的父项时 item->setData( "child", Qt::AccessibleDescriptionRole ); 否则 然后使用这些信息进行绘制: if ( ty
您可以在此处找到如何执行此操作的说明: 其思想是添加父项和子项,然后在自定义委托的帮助下对它们进行不同的绘制 也就是说,你设置了
item->setData( "parent", Qt::AccessibleDescriptionRole );
添加组和的父项时
item->setData( "child", Qt::AccessibleDescriptionRole );
否则
然后使用这些信息进行绘制:
if ( type == QLatin1String( "parent" ) ) {
QStyleOptionViewItem parentOption = option;
parentOption.state |= QStyle::State_Enabled;
QItemDelegate::paint( painter, parentOption, index );
}
else if ( type == QLatin1String( "child" ) ) {
QStyleOptionViewItem childOption = option;
int indent = option.fontMetrics.width( QString( 4, QChar( ' ' ) ) );
childOption.rect.adjust( indent, 0, 0, 0 );
childOption.textElideMode = Qt::ElideNone;
QItemDelegate::paint( painter, childOption, index );
}
这是我的简单示例。如果有人需要。 此外,我还添加了具有相同功能的listview。 comboboxdelegate.h:
#ifndef COMBOBOXDELEGATE_H
#define COMBOBOXDELEGATE_H
#include <QItemDelegate>
#include <QPainter>
class ComboBoxDelegate : public QItemDelegate
{
Q_OBJECT
public:
explicit ComboBoxDelegate(QObject *parent = nullptr);
protected:
void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
#endif // COMBOBOXDELEGATE_H
main.cpp:
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
ComboBoxDelegate.pro:
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = ComboBoxDelegate
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp \
comboboxdelegate.cpp
HEADERS += mainwindow.h \
comboboxdelegate.h
FORMS += mainwindow.ui
mainwindow.ui:
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>345</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralWidget">
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<widget class="QComboBox" name="comboBox"/>
</item>
<item row="1" column="0">
<widget class="QListView" name="listView"/>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menuBar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>23</height>
</rect>
</property>
</widget>
<widget class="QToolBar" name="mainToolBar">
<attribute name="toolBarArea">
<enum>TopToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak">
<bool>false</bool>
</attribute>
</widget>
<widget class="QStatusBar" name="statusBar"/>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>
主窗口
0
0
400
345
主窗口
0
0
400
23
顶部工具栏区域
假的
我认为您应该使用QComboBox::setView()
将树视图设置为组合框视图。该链接不可用。您可以使用wayback machine://检查链接格式是否错误。点击链接不起作用。只需复制并粘贴到浏览器上即可。谢谢。请解释为什么您需要QString(4,QChar(“”))
在代理中以及设置项目文本时,不需要“QString(4,QChar(“”))。第一个是文本前的空格,第二个是文本后的空格。第二,绝对过剩。最初有方括号(例如:“[one]”)。我编辑了源代码-删除第二个。
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "comboboxdelegate.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
start();
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::start() {
QStandardItemModel * model = new QStandardItemModel;
addParentItem(model, "Success");
addChildItem(model, "one", 1);
addChildItem(model, "two", 2);
addChildItem(model, "three", 3);
addParentItem(model, "Failed");
addChildItem(model, "one", 1);
addChildItem(model, "two", 2);
addChildItem(model, "three", 3);
ui->comboBox->setModel(model);
ui->comboBox->setItemDelegate(new ComboBoxDelegate);
ui->listView->setModel(model);
ui->listView->setItemDelegate(new ComboBoxDelegate);
}
void MainWindow::addParentItem( QStandardItemModel * model, const QString& text )
{
QStandardItem* item = new QStandardItem( text );
item->setFlags( item->flags() & ~( Qt::ItemIsEnabled | Qt::ItemIsSelectable ) );
item->setData( "parent", Qt::AccessibleDescriptionRole );
QFont font = item->font();
//font.setBold( true );
font.setItalic( true );
item->setFont( font );
model->appendRow( item );
}
void MainWindow::addChildItem( QStandardItemModel * model, const QString& text, const QVariant& data )
{
QStandardItem* item = new QStandardItem( text );
item->setData( data, Qt::UserRole );
item->setData( "child", Qt::AccessibleDescriptionRole );
model->appendRow( item );
}
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = ComboBoxDelegate
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp \
comboboxdelegate.cpp
HEADERS += mainwindow.h \
comboboxdelegate.h
FORMS += mainwindow.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>345</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralWidget">
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<widget class="QComboBox" name="comboBox"/>
</item>
<item row="1" column="0">
<widget class="QListView" name="listView"/>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menuBar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>23</height>
</rect>
</property>
</widget>
<widget class="QToolBar" name="mainToolBar">
<attribute name="toolBarArea">
<enum>TopToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak">
<bool>false</bool>
</attribute>
</widget>
<widget class="QStatusBar" name="statusBar"/>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>