我要评论需求
点击qcombobox时，下拉列表以多行多列的表格展示出来。
实现
直接上代码：
#include <qcombobox>
#include <qtablewidget>
#include <qvboxlayout>
#include <qwidget>
#include <qevent>
#include <qmouseevent>
#include <qlineedit>
class comboboxwithtablewidget : public qcombobox {
q_object
public:
comboboxwithtablewidget(qwidget *parent = nullptr) : qcombobox(parent) {
// 隐藏默认的下拉箭头
seteditable(true);
lineedit()->setreadonly(true);
// 创建一个隐藏的容器来存放我们的表格
popupwidget = new qwidget(this);
popupwidget->setwindowflags(qt::popup | qt::framelesswindowhint);
qvboxlayout *layout = new qvboxlayout(popupwidget);
layout->setcontentsmargins(0, 0, 0, 0);
layout->setspacing(0);
tablewidget = new qtablewidget(5, 2, popupwidget); // 5行2列
for (int row = 0; row < 5; ++row)
{
for (int col = 0; col < 2; ++col)
{
qtablewidgetitem *item = new qtablewidgetitem(qstring("item %1%2").arg(row).arg(col));
tablewidget->setitem(row, col, item);
}
}
tablewidget->setselectionbehavior(qabstractitemview::selectrows);
tablewidget->setselectionmode(qabstractitemview::singleselection);
layout->addwidget(tablewidget);
popupwidget->resize(220,200);
connect(tablewidget, &qtablewidget::cellclicked, this, &comboboxwithtablewidget::oncellclicked);
popupwidget->hide();
}
protected:
void showpopup() override
{
if (popupwidget->ishidden())
{
qcombobox::showpopup();
//popupwidget->resize(this->width(), tablewidget->height() + 2); //（可能需要调整）
popupwidget->move(this->maptoglobal(qpoint(0, this->height())));
popupwidget->show();
tablewidget->setfocus();
}
}
void hidepopup() override
{
if (popupwidget->isvisible())
{
popupwidget->hide();
qcombobox::hidepopup();
}
}
private slots:
void oncellclicked(int row, int column)
{
qstring text = tablewidget->item(row, column)->text();
this->setcurrenttext(text);
hidepopup(); // 选择后隐藏下拉列表
}
private:
qwidget *popupwidget = nullptr;
qtablewidget *tablewidget= nullptr;
};示例效果
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