Qt tablView 模型包含指向自定义类的指针 [英] Qt tablView with model containg pointer to custom class
问题描述
我创建了从 QGraphicsItem 继承的自定义类 (CustomObject).我使用这些对象在场景上绘制(矩形、多边形和其他东西)，并将指向它们的指针存储在 QList 中.现在我需要在 tableView 中显示我所有的 CustomOBjects，但有两个条件:
I created my custom class (CustomObject), that inherit from QGraphicsItem. I use those object to draw on scene (rectangles, polygons and stuff) and I store pointers to them in QList. Now I need to display all my CustomOBjects in tableView, but there are 2 conditions:
- 当我在 tableview 中选择对象并与之交互时 - 我必须能够与它表示的真实"CustomObject 交互(例如:我在 tableview 中选择了 obj1 并单击按钮删除"或编辑" - 我想能够与 acctaul 对象交互(删除或编辑它).
- 当我添加或更改它时 - 我希望在 tableView 中看到更改.
我不确定我是否可以使用 jsut table view 和 soem 自定义 mdoel 来实现这一点——或者我应该制作自己的 QAbstractItemModel 类，但如果我这样做了——我该怎么做?我应该让类从 QAbstractItemModel 继承并添加指向我的 CustomObject 的指针，还是只是强制我的 CustomObjects 进入特定模型?
I'm not sure if i can achieve that with jsut table view and soem custom mdoel - or shoud I make my own QAbstractItemModel class, but if i do - how do i do it? Shoud i make class inherit from QAbstractItemModel and add pointer to my CustomObject, or just force my CustomObjects into soem specific model?
我的一些代码:
这是我的 CustomObject.h//我删除了一些与我的应用程序的特定功能相关的个人"功能严格相关的代码
Here is my CustomObject.h //I removed some code that was stricly related to "personal" functions related with specific features of my app
class CustomObject : public QGraphicsItem
{
public:
CustomObject();
CustomObject(int _x, int _y, int _w, int _h);
virtual QRectF boundingRect() const;
void set_Name(QString name);
QString get_Name();
protected:
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
private:
QString Name;
我将它们存储在列表中，在我的监督者"类中:
I store them in list, in my "Overseer" class:
class ObjOverseer
public:
void drawingCustomObject_Do(int x, int y); //This function creates new "CustomObject" and adds it to the list (below)
QList<CustomObject*> ObjectsList_CustomObjects;
在我的主窗口中 - 我只是创建了 ObjOverseer 并保留它的指针.
In my mainwindow - I simply create that ObjOverseer and keep its pointer.
编辑 1
我使用了这个例子:https://doc.qt.io/archives/4.6/itemviews-addressbook.html并创建了这个类:
I used this example: https://doc.qt.io/archives/4.6/itemviews-addressbook.html and created this class:
CustomModelOfCustomObject::CustomModelOfCustomObject()
{
}
CustomModelOfCustomObject::CustomModelOfCustomObject(QObject *parent)
: QAbstractTableModel(parent)
{
}
CustomModelOfCustomObject::CustomModelOfCustomObject(QList<CustomObject*> objects, QObject *parent)
: QAbstractTableModel(parent)
{
ListOfObjects=objects;
}
int CustomModelOfCustomObject::rowCount(const QModelIndex &parent) const
{
Q_UNUSED(parent);
return ListOfObjects.size();
}
int CustomModelOfCustomObject::columnCount(const QModelIndex &parent) const
{
Q_UNUSED(parent);
return 2;//TODO - ZMIENIC ILOSC KOLUMN
}
QVariant CustomModelOfCustomObject::data(const QModelIndex &index, int role) const
{
if (!index.isValid())
return QVariant();
if (index.row() >= ListOfObjects.size() || index.row() < 0)
return QVariant();
if (role == Qt::DisplayRole) {
CustomObject* obj = ListOfObjects.at(index.row());
if (index.column() == 0)
return obj->get_Name();
else if (index.column() == 1)
return obj->get_Address();
}
return QVariant();
}
QVariant CustomModelOfCustomObject::headerData(int section, Qt::Orientation orientation, int role) const
{
if (role != Qt::DisplayRole)
return QVariant();
if (orientation == Qt::Horizontal) {
switch (section) {
case 0:
return tr("Name");
case 1:
return tr("Address");
default:
return QVariant();
}
}
return QVariant();
}
bool CustomModelOfCustomObject::insertRows(int position, int rows, const QModelIndex &index)
{
Q_UNUSED(index);
beginInsertRows(QModelIndex(), position, position+rows-1);
for (int row=0; row < rows; row++) {
CustomObject* obj;
ListOfObjects.insert(position, obj);
}
endInsertRows();
return true;
}
bool CustomModelOfCustomObject::removeRows(int position, int rows, const QModelIndex &index)
{
Q_UNUSED(index);
beginRemoveRows(QModelIndex(), position, position+rows-1);
for (int row=0; row < rows; ++row) {
ListOfObjects.removeAt(position);
}
endRemoveRows();
return true;
}
bool CustomModelOfCustomObject::setData(const QModelIndex &index, const QVariant &value, int role)
{
if (index.isValid() && role == Qt::EditRole) {
int row = index.row();
CustomObject* p = ListOfObjects.value(row);
if (index.column() == 0)
p->set_Name(value.toString());
else if (index.column() == 1)
p->set_Address(value.toString());
else
return false;
ListOfObjects.replace(row, p);
emit(dataChanged(index, index));
return true;
}
return false;
}
Qt::ItemFlags CustomModelOfCustomObject::flags(const QModelIndex &index) const
{
if (!index.isValid())
return Qt::ItemIsEnabled;
return QAbstractTableModel::flags(index) | Qt::ItemIsEditable;
}
QList<CustomObject*> CustomModelOfCustomObject::getList()
{
return ListOfObjects;
}
但是，当我到达我应该使用这个模型的函数点时 - 我不知道我应该添加它，或者即使我能够按预期使用它.
But still, when i reach point in my function where i shoud use this model- i dont know hwo i shoud add it or even if i will be able to use it as intended.
编辑 2当我将 ListOfObject 更改为 public 并尝试时:
EDIT 2 When i chaned ListOfObject to public and tried:
MyModel->ListOfObjects.append(newObj);
全部崩溃
推荐答案
解决了.现在我只将对象的表示"添加到模型中，每当我需要更新任何对象(例如更改名称或颜色)时，我只是通过我的监督者来完成，传递 soem 类型的 guid/标识符/id/任何可以让我区分对象.
Solved it. Now i only add "representation" of object to model and whenever i need to update any object (ew. change name or color) i just do it via my overseer, passing soem kind of guid/identifier/id/anything that woudl let me tell objects apart form eachother.
这篇关于Qt tablView 模型包含指向自定义类的指针的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
