[Qt-jambi-interest] BackgroundRole

[Vincent Lebreil]

Hi Gunnar,

it works with your example, ie with a QTableView and a QAbstractTableModel,
but not with a QTreeView and a QAbstractItemModel.

Any idea ?

Here's the code:

------------------8<--------------------------

import java.util.ArrayList;
import java.util.List;

import com.trolltech.qt.core.QAbstractItemModel;
import com.trolltech.qt.core.QModelIndex;
import com.trolltech.qt.core.Qt;
import com.trolltech.qt.core.Qt.ItemFlags;
import com.trolltech.qt.core.Qt.Orientation;
import com.trolltech.qt.gui.QApplication;
import com.trolltech.qt.gui.QColor;
import com.trolltech.qt.gui.QTreeView;

public class MyModel extends QAbstractItemModel {

    private String[] headers = new String[]{"A", "B"};

    private List<String> myList = null;

    public MyModel(List<String> list) {
        this.myList = list;
    }

    @Override
    public Object headerData(int section, Orientation orientation, int role)
{
        Object data = null;
        if (role ==  Qt.ItemDataRole.DisplayRole){
            data = headers[section];
        }
        return data;
    }


    @Override
    public int columnCount(QModelIndex parent) {
        return headers.length;
    }

    @Override
    public Object data(QModelIndex index, int role) {
        switch (role) {
        case Qt.ItemDataRole.DisplayRole:
            return myList.get(index.row()) + ":" + index.column();
        case Qt.ItemDataRole.BackgroundRole:
            return QColor.red;
        default:
            break;
        }
        return null;
    }

    @Override
    public QModelIndex index(int row, int column, QModelIndex parent) {
        QModelIndex index = null;
        if (parent == null) {
            if (row >= 0 && row < myList.size()) {
                index = createIndex(row, column, 1);
            }
        }
        return index;

    }

    @Override
    public QModelIndex parent(QModelIndex child) {
        QModelIndex parent = null;
        return parent;
    }

    @Override
    public int rowCount(QModelIndex parent) {
        int rowCount = 0;
        if (parent == null) {
            rowCount = myList.size();
        }

        return rowCount;
    }

    @Override
    public ItemFlags flags(QModelIndex index) {
        return super.flags(index);
    }

    public static void main(String args[]) {
        QApplication.initialize(args);

        QTreeView view = new QTreeView();

        ArrayList<String> list = new ArrayList<String>();
        list.add("One");
        list.add("Two");
        list.add("Three");

        final MyModel model = new MyModel(list);
        view.setModel(model);

        view.show();

        QApplication.exec();
    }

}
------------------8<--------------------------

On Mon, Feb 9, 2009 at 11:02 AM, Gunnar Sletta <gunnar at trolltech.com> wrote:

> Vincent Lebreil wrote:
>
>> Hi,
>>
>> I'm trying to display a background color for all items of my model.
>> I've tried to return a QColor in my data method for BackgroundRole. But
>> this color is only displayed if the mouse is over one row of my view. This
>> color is not displayed for all the rows of my view.
>> I don't understand why, cause if I do the same thing but with
>> DecorationRole, it works great (ie all the rows of my view have this
>> decoration).
>>
>> Thanks for your help
>>
>
> Hi Vincent,
>
> In the following example, I set the displayrole to red and it consistently
> produces red cells. Are you doing anyting differently?
>
> import java.util.*;
> import com.trolltech.qt.gui.*;
> import com.trolltech.qt.core.*;
>
> public class TableModelMyFile extends QAbstractTableModel {
>    ArrayList<String> myFiles;
>
>    public TableModelMyFile(ArrayList<String> myFiles) {
>        this.myFiles = myFiles;
>    }
>
>    public int columnCount(QModelIndex i) { return 5; }
>    public int rowCount(QModelIndex i) { return myFiles.size(); }
>
>    public Object data(final QModelIndex index, int role) {
>        switch (role) {
>        case Qt.ItemDataRole.DisplayRole:
>            return myFiles.get(index.row()) + ":" + index.column();
>        case Qt.ItemDataRole.BackgroundRole:
>            return QColor.red;
>        default:
>            break;
>        }
>        return null;
>    }
>
>
>    public void doStuff() {
>        beginInsertRows(null, 3, 3);
>        myFiles.add("Four");
>        endInsertRows();
>    }
>
>
>    public static void main(String args[]) {
>        QApplication.initialize(args);
>
>        QTableView view = new QTableView();
>
>        ArrayList<String> list = new ArrayList<String>();
>        list.add("One");
>        list.add("Two");
>        list.add("Three");
>
>        final TableModelMyFile model = new TableModelMyFile(list);
>        view.setModel(model);
>
>        view.show();
>
>        QApplication.invokeLater(3000, new Runnable() {
>                public void run() {
>                    model.doStuff();
>                }
>            });
>
>        QApplication.exec();
>    }
> }
>
>
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