设置单元格背景颜色在 TreeView Gtk C# 上无法正常工作

Question

Using SetCellDataFunc for modifying cell property at runtime.

Requirement: Modify cell background colour for a particular column

Want to modify cell colour of " Item Quantit y" Column

It modifies the colour of the cell of all columns.

this unexpected behaviour because enabled the only for one column.

Can you please help me with this

Please find snippet code

using System;
using Gtk;

public partial class MainWindow : Gtk.Window
{
private Gtk.TreeView treeView;
private Gtk.ListStore listStore;

private Gtk.VBox ItemViewPad;
private Gtk.ScrolledWindow scrolledWindow;

public MainWindow() : base(Gtk.WindowType.Toplevel)
{
    Build();

    ItemViewPad = new VBox();

    scrolledWindow = new ScrolledWindow();

    treeView = new TreeView();

    listStore = new ListStore(typeof(string), typeof(string), typeof(string));

    CellRendererText cellRendererText = new CellRendererText();
    TreeViewColumn treeViewColumnName = new TreeViewColumn();
    treeViewColumnName.Expand = true;
    treeViewColumnName.Title = "Item Name";
    treeViewColumnName.PackStart(cellRendererText, false);
    treeViewColumnName.AddAttribute(cellRendererText, "text", 0);

    TreeViewColumn treeViewColumnType = new TreeViewColumn();
    treeViewColumnType.Expand = true;
    treeViewColumnType.Title = "Item Type";
    treeViewColumnType.PackStart(cellRendererText, false);
    treeViewColumnType.AddAttribute(cellRendererText, "text", 1);

    TreeViewColumn treeViewColumnQuantity = new TreeViewColumn();
    treeViewColumnQuantity.Expand = true;
    treeViewColumnQuantity.Title = "Item Quantity";
    treeViewColumnQuantity.PackStart(cellRendererText, false);
    treeViewColumnQuantity.AddAttribute(cellRendererText, "text", 2);
    treeViewColumnQuantity.SetCellDataFunc(cellRendererText, new TreeCellDataFunc(OnChangedQuantity));

    treeView.AppendColumn(treeViewColumnName);
    treeView.AppendColumn(treeViewColumnType);
    treeView.AppendColumn(treeViewColumnQuantity);

    treeView.Model = listStore;

    scrolledWindow.Add(treeView);

    ItemViewPad.PackStart(scrolledWindow, true, true, 6);

    Add(ItemViewPad);
    if ((this.Child != null))
        this.Child.ShowAll();
    ShowAll();

    listStore.AppendValues(new object[] { "Pen", "10", "10" });
    listStore.AppendValues(new object[] { "Pencil", "20", "20" });
    listStore.AppendValues(new object[] { "ColorPen", "30", "30" });
}

private void OnChangedQuantity(TreeViewColumn tree_column, CellRenderer cell, TreeModel tree_model, TreeIter iter)
{
    string quantity = (string)tree_model.GetValue(iter, 2);
    if(string.IsNullOrEmpty(quantity))
    {
        return;
    }

    Console.WriteLine(tree_column.Title);

    Gdk.Color color = cell.CellBackgroundGdk;

    if(string.Compare(quantity, "30") == 0)
    {
        color = new Gdk.Color(255, 0, 0);
    }
    else if (string.Compare(quantity, "20") == 0)
    {
        color = new Gdk.Color(0, 255, 0);
    }
    else if (string.Compare(quantity, "10") == 0)
    {
        color = new Gdk.Color(0, 0, 255);
    }

    cell.CellBackgroundGdk = color;
}

private void OnChangedType(TreeViewColumn tree_column, CellRenderer cell, TreeModel tree_model, TreeIter iter)
{
    string type = (string)tree_model.GetValue(iter, 1);
    if (string.IsNullOrEmpty(type))
    {
        return;
    }

    Gdk.Color color = cell.CellBackgroundGdk;

    if (string.Compare(type, "30") == 0)
    {
        color = new Gdk.Color(0, 0, 255);
    }
    else if (string.Compare(type, "20") == 0)
    {
        color = new Gdk.Color(0, 255, 0);
    }
    else if (string.Compare(type, "10") == 0)
    {
        color = new Gdk.Color(255, 0, 0);
    }

    cell.CellBackgroundGdk = color;
}

private void OnChangedName(TreeViewColumn tree_column, CellRenderer cell, TreeModel tree_model, TreeIter iter)
{
    string name = (string)tree_model.GetValue(iter, 0);
    if (string.IsNullOrEmpty(name))
    {
        return;
    }
}

protected void OnDeleteEvent(object sender, DeleteEventArgs a)
{
    Application.Quit();
    a.RetVal = true;
}
}

    public static void Main(string[] args)
    {
        Application.Init();
        MainWindow win = new MainWindow();
        win.Show();
        Application.Run();
    }

Answer 1

Need to use different CellRendererText binding for each Column.

    CellRendererText cellRendererTextName = new CellRendererText();
    TreeViewColumn treeViewColumnName = new TreeViewColumn();
    treeViewColumnName.Expand = true;
    treeViewColumnName.Title = "Item Name";
    treeViewColumnName.PackStart(cellRendererTextName, false);
    treeViewColumnName.AddAttribute(cellRendererTextName, "text", 0);

    CellRendererText cellRendererTextType = new CellRendererText();
    TreeViewColumn treeViewColumnType = new TreeViewColumn();
    treeViewColumnType.Expand = true;
    treeViewColumnType.Title = "Item Type";
    treeViewColumnType.PackStart(cellRendererTextType, false);
    treeViewColumnType.AddAttribute(cellRendererTextType, "text", 1);
    treeViewColumnType.SetCellDataFunc(cellRendererTextType, new TreeCellDataFunc(OnChangedType));

    CellRendererText cellRendererTextQuantity = new CellRendererText();
    TreeViewColumn treeViewColumnQuantity = new TreeViewColumn();
    treeViewColumnQuantity.Expand = true;
    treeViewColumnQuantity.Title = "Item Quantity";
    treeViewColumnQuantity.PackStart(cellRendererTextQuantity, false);
    treeViewColumnQuantity.AddAttribute(cellRendererTextQuantity, "text", 2);
    treeViewColumnQuantity.SetCellDataFunc(cellRendererTextQuantity, new TreeCellDataFunc(OnChangedQuantity));