Jak zobrazit ToolTip nad vlastnim objektem v ListBoxu

Ted jsem se trochu zasekl na vytvareni ToolTipu na kazde polozce ListBoxu, a na scesti me privedli i nektere rady na webu, ale o tom az nize. Cely kod je tentokrat velice primitivni. Prvne si vytvorime ListBox, se sablonou, ktera bude zobrazovat TextBlock a nad nim ToolTip. Data budeme brat pomoci Data Bindingu:

<ListBox x:Name="lbSongs" Height="160" MaxHeight="160" Margin="0" Padding="0">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Path=FileName}">
                        <ToolTipService.ToolTip>
                        <TextBlock Text="{Binding Path=DirectoryName}"> </TextBlock>
                            </ToolTipService.ToolTip>
                    </TextBlock>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

<ListBox.ItemTemplate>

<ToolTipService.ToolTip>

</ToolTipService.ToolTip>

</TextBlock>

</DataTemplate>

</ListBox.ItemTemplate>

</ListBox>

Problem s nekterymi clanky na webu byl ten ze jsem chtel pouzit primo misto s vnitrnim TextBlockem a pak mi to hazelo tuto vyjimku: “Add value to collection of type ‘System.Windows.Documents.InlineCollection’ threw an exception.”. Druhym krokem je pak vytvoreni vlastni tridy, ktera bude obsahovat vlastnosti DirectoryName a FileName, tak jak jsou zminovany v XAMLu. Metoda FS.GetPathAndFileName je velice jednoducha, pouze vraci pomoci out vystup metody Path.GetDirectoryName() a Path.GetFileName():

using System.Windows.Controls;
using System.Windows.Documents;
class Song
{
    public Song(string fn)
    {
        string p, s;
        FS.GetPathAndFileName(fn, out p, out s);
        FileName = s;
        DirectoryName = p;
    }
    public string FileName
    {
        get
        ;
        set
        ;
    }
    public string DirectoryName
    {
        get
        ;
        set
        ;
    }
    public override string ToString()
    {
        return FileName;
    }
}

using System.Windows.Controls;

using System.Windows.Documents;

class Song

{

public Song(string fn)

{

string p, s;

FS.GetPathAndFileName(fn, out p, out s);

FileName = s;

DirectoryName = p;

}

public string FileName

{

get

;

set

;

}

public string DirectoryName

{

get

;

set

;

}

public override string ToString()

{

return FileName;

}

Poslednim krokem je naplneni ListBoxu, to samozrejme provedeme v Code-Behindu:

public RightToolTipApproachForCustomObjects()
{
    InitializeComponent();
    PopulateListBox();
    }
    void PopulateListBox()
    {
    List<Song> files3 = new List<Song>();
    files3.Add(new Song(@"C:\Users\sunamo\Desktop\Dolcezza 1.mp3"));
    files3.Add(new Song(@"C:\Users\sunamo\Desktop\Dolcezza 2.mp3"));
    lbSongs.ItemsSource = files3;
}

public RightToolTipApproachForCustomObjects()

{

InitializeComponent();

PopulateListBox();

}

void PopulateListBox()

{

List<Song> files3 = new List<Song>();

files3.Add(new Song(@"C:\Users\sunamo\Desktop\Dolcezza 1.mp3"));

files3.Add(new Song(@"C:\Users\sunamo\Desktop\Dolcezza 2.mp3"));

lbSongs.ItemsSource = files3;

}

Finalni vysledek muze pak vypadat nejak takto:

Samozrejme u vas to nemusi vypadat takhle, ale jednoduseji, v programu z ktereho se cerpa pro tuto ukazku totiz pouzivam styly z Windows Store Apps.

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