Qt QAbstractTableModel的使用以及在QML下调用

最近有个需求,就是在QML中显示一个表格, 表格中显示一些字符,此外还需要显示数值和图形(圆形图像不同颜色代表true/false)。网上找了很多内容发现不是很适用,好多都是适用widget适用C++来做表格。但是widget做的在QML下使用感觉又有点问题(widget使用paint渲染, 但是QML使用的是scense graph,使用QSGNode)。那还是用QAbsractTableMode来用C++实现Model, 而在QML下使用TableView,把显示和数据分开处理。

对于使用QAbstractTableMode, 网上有比较多的介绍。下面这个是写的不错的: 

https://blog.youkuaiyun.com/qq411633267/article/details/80817275

根据这篇,在C++部分,实现了下面的几个函数,分别是: 

columnCount(const QModelIndex &parent) const; 返回表格的列数

rowCount(const QModelIndex &parent) const; 返回表格的行数;

QVariant data(const QModelIndex &index, int role) const; 根据index和role来返回表格数据;

QHash<int, QByteArray> roleNames() const; 返回roles;

在创建Model时, 创建一个QStringList, 设置几个roles。每一列设置一个role。

在QML中,TableView下使用: 

TableViewColumn{role: "rolename"; title:"Title"; width: xx }

使用这个设置TableView的一列,其中的role成员需要和C++部分创建的QStringList设置的ro

使用 AbstractTableModel 构建Table 在表格中添加JButton按钮,之前在网上找了2天没有找到好用的程序,最终终于找到一个好用的例子。 不要使,我退你们分。。 sing the Swing JTable class can quickly become a sticky business when you want to customize it to your specific needs. First you must become familiar with how the JTable class is organized. Individual cells are rendered by TableCellRenderer implementations. The table contents are represented by an implementation of the TableModel interface. By default, JTable uses DefaultTableCellRenderer to draw its cells. DefaultTableCellRenderer recognizes a few primitive types, rendering them as strings, and can even display Boolean types as checkboxes. But it defaults to displaying the value returned by toString() for types it does not specifically handle. You have to provide your own TableCellRenderer implementation if you want to display buttons in a JTable. The TableCellRenderer interface contains only one method, getTableCellRendererComponent(...), which returns a java.awt.Component that knows how to draw the contents of a specific cell. Usually, getTableCellRendererComponent() will return the same component for every cell of a column, to avoid the unnecessary use of extra memory. But when the contents of a cell is itself a component, it is all right to return that component as the renderer. Therefore, the first step towards having JButtons display correctly in a JTable is to create a TableCellRenderer implementation that returns the JButton contained in the cell being rendered. In the accompanying code listing, JTableButtonRenderer demonstrates how to do this. Even after creating a custom TableCellRenderer, you're still not done. The TableModel associated with a given JTable does not only keep track of the contents of each cell, but it also keeps track of the class of data stored in each column. DefaultTableModel is designed to work with DefaultTableCellRenderer and will return java.lang.String.class for columns containing data types that it does not specifically handle. The exact method that does this is getColumnClass(int column). Your second step is to create a TableModel implementation that returns JButton.class for cells that contain JButtons. JTableButtonModel shows one way to do this. It just returns the result of getClass() for each piece of cell data. At this point, you're almost done, but not quite. What's the use of putting a JButton in a JTable if you can't press the darn thing? By default, JTable will not forward mouse events to components contained in its cells. If you want to be able to press the buttons you add to JTable, you have to create your own MouseListener that forwards events to the JButton cells. JTableButtonMouseListener demonstrates how you could do this.
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