Question

我目前正在使用mono和gtk＃。关于TreeView，有Tutorial。我想实现与“控制模型的使用方式”相同的内容所以我有Song Class和Render-Methods来显示艺术家和标题。

但是我希望通过TreeStore而不是ListStore来显示它。因此，我为每个字母都有一个Rootnode，在此节点下，所有以此字母开头的艺术家都应该显示。

我的问题如何将这些RootNode添加到TreeStore？我应该在哪里添加它们？

songs.Add(new Song("Dancing Djs vs. Roxette", "Fading like a flower"));
songs.Add(new Song("Xaiver","give me the right"));
songs.Add(new Song("Daft Punkt","Technologic"));

TreeStore musicListStore = new TreeStore(typeof(Song));
foreach (var s in songs) 
{
    musicListStore.AppendValues(s);
}

treeview1.Model = musicListStore;

treeview1.AppendColumn("Artist", new CellRendererText(),new TreeCellDataFunc(RenderArtistName));
treeview1.AppendColumn("Title", new CellRendererText(),new TreeCellDataFunc(RenderSongTitle));

private void RenderArtistName(TreeViewColumn column, CellRenderer cell, TreeModel model, TreeIter iter)
{
    Song s = model.GetValue(iter,0) as Song;
    (cell as CellRendererText).Text = s.Artist;
}

private void RenderSongTitle(TreeViewColumn column, CellRenderer cell, TreeModel model, TreeIter iter)
{
    Song s = model.GetValue(iter,0) as Song;
    (cell as CellRendererText).Text = s.Title;
}

所以我想要实现每个字母都有RootNodes，每个字母下面都应该有从这封信开始列出的所有艺术家。

我的问题是如何将字母添加到TreeStore以及我如何知道在哪里插入每首歌曲。

以下是我希望它看起来的截图（我不允许直接上传它们。所以我必须使用外部托管.Sry）： Screenshot

Answer 1

您可以非常轻松地构建树。例如;

var store = new Gtk.TreeStore( typeof(string) );

// add a root node
var root = store.AppendValues("hello"); 

// add a child of the root
store.AppendValues(root,"world");

// add another child
var mono = store.AppendValues(root,"mono");

// add a second level child
store.AppendValues(mono,"gtk");

所以，在你的音乐应用的背景下..

// title, artist
var store = new Gtk.TreeStore( typeof(string), typeof(string) );

// make an index of top level nodes using thier TreeIters
var index = new Dictionary<string,Gtk.TreeIter>();

// add index nodes
foreach ( var letter in new List<string>{ "A", "B", "C" ... "Z" } ){
    index[letter.ToLower()] = store.AppendValues( letter );
}

// add songs
foreach ( var song in songlist ){
    var title = song.Title;
    var artist = song.Artist;

    var first = title.SubString(0,1).ToLower();
    var iter = store[first];

    // add this song
    store.AppendValues( iter, title, artist );
}

如果要动态添加索引节点，则必须执行一些额外的工作，每次在某个级别添加节点时，该级别或更深层次的所有树特值都将变得毫无价值。

Answer 2

    songs.Add(new Song("Dancing Djs vs. Roxette", "Fading like a flower"));
    songs.Add(new Song("Xaiver","give me the right"));
    songs.Add(new Song("Daft Punkt","Technologic"));

    TreeStore musicListStore = new TreeStore(typeof(Song));
    foreach (var s in songs) 
    {
        musicListStore.AppendValues(s);
    }

    treeview1.Model = musicListStore;

    treeview1.AppendColumn("Artist", new CellRendererText(),new TreeCellDataFunc(RenderArtistName));
    treeview1.AppendColumn("Title", new CellRendererText(),new TreeCellDataFunc(RenderSongTitle));

private void RenderArtistName(TreeViewColumn column, CellRenderer cell, TreeModel model, TreeIter iter)
{
    Song s = model.GetValue(iter,0) as Song;
    (cell as CellRendererText).Text = s.Artist;
}

private void RenderSongTitle(TreeViewColumn column, CellRenderer cell, TreeModel model, TreeIter iter)
{
    Song s = model.GetValue(iter,0) as Song;
    (cell as CellRendererText).Text = s.Title;
}

所以我想要实现每个字母都有RootNodes，每个字母下面都应该有从这封信开始列出的所有艺术家。

我的问题是如何将字母添加到TreeStore以及我如何知道在哪里插入每首歌曲。

以下是我希望它看起来的截图（我不允许直接上传它们。所以我必须使用外部托管.Sry）： Screenshot

GTK＃treeview分层数据显示

2 个答案: