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我主要是一個.Net開發人員，並且一直在調查Qt一段時間。我現在正試圖在Qt中實現模型/視圖框架。我認爲我掌握了基本原理，但不清楚如何在更復雜的用戶界面中將小工具掛在一起，小工具需要相互溝通。鑑於以下內容：從嵌套對象集合開始Qt模型/視圖
// 'domain' model classes
class NestedDomainModel1
{
public:
NestedDomainModel1();
QString name() const;
void setName(const QString& newName);
// other properties
private:
QString m_name;
};
class NestedDomainModel2
{
public:
NestedDomainModel2();
QString name() const;
void setName(const QString& newName);
// other properties
};
class MyDomainModel
{
public:
MyDomainModel();
void addNestedModel1(const NestedDomainModel1& modelToAdd);
NestedDomainModel& nestedObjectModel1At(int index);
int nestedObjectModel1Count() const;
// repeat for model 2
private:
QList<NestedDomainModel1> m_nestedModels1;
QList<NestedDomainModel2> m_nestedModels2;
};
// 'GUI' classes
class MainWindow : public QMainWindow
{
private:
MyDomainModel* m_model;
MyTreeViewWidget* m_treeWidget; // -> this sits in a left dock window
MyInfoDisplayWidget* m_infoWidget; // -> this sits in a right dock window and display details about the item selected in the tree
};
class MyDomainModelTreeModel : public QAbstractItemModel
{
public:
explicit MyDomainModelTreeModel(MyDomainModel* model);
// required overrides for QAbstractItemModel
private:
MyDomainModel* m_model;
};
class MyTreeViewWidget : public QWidget
{
public:
// Take a pointer to the domain model and create a model for the 'view'.
// Will create a tree like:
// Nested Objects 1
// |- object 001
// |- object 002
// |- you get the idea
// Nested Objects 2
// |- other object 001
// |- more of the same
explicit MyTreeViewWidget(MyDomainModel* model);
public slots:
// Used to notify widget when an item is added to the underlying model.
void nestedModel1Added();
void nestedModel2Added();
signals:
void nestedModel1Selected(NestedDomainModel1& selectedModel);
void nestedModel2Selected(NestedDomainModel2& selectedModel);
private slots:
// connect to tree view event when an item is selected and if all ok, emit one of the selected events
void onTreeItemSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
private:
QTreeView* m_treeView;
MyDomainModelTreeModel* m_treeModel;
};
class MyNestedClass1ViewModel : QAbstractItemModel
{
public:
explicit MyNestedClass1ViewModel(NestedDomainModel1* model);
setModel(NestedDomainModel1* model);
// required overrides for QAbstractItemModel
private:
NestedDomainModel1* m_model
};
class MyInfoDisplayWidget : public QWidget
{
public:
explicit MyInfoDisplayWidget(QWidget* parent = 0);
public slots:
// this is connected to the 'tree' widget signal in MainWindow
void setModel(NestedDomainModel1& selectedModel);
};
UI的基本前提與Visual Studio相似。該樹類似於解決方案資源管理器，「信息顯示」類似於屬性窗口。
這是你如何使用模型/視圖框架？對於那些熟悉WPF/Silverlight開發的人來說，是MVVM類似的模型/視圖框架（高層次），因爲它是'視圖模型'並且包含/包含域模型？
這是你如何使用模型/視圖框架連接小部件（即一個小部件將模型的指針或引用傳遞給另一個）？或者我應該使用SelectionModel？由於樹模型包含不同類型的對象，這是否行得通？
如何識別根節點？例如，創建MyNestedObject1並需要將其添加到樹時，我是否依賴於根節點位於模型索引QModelIndex（0，0）（即行0具有無效父索引）的知識？