TreeView Data Template & Binding Question - WPF Discussion Boards

How to make muti-geometryModel3D to make different colors in different trangles ? i may wanna build many trangle but must with different color , but i don't know how to do it . if someone knows , please tell me how to do , thank you very much

Hey guys,

I am using the following codes to draw a line, how can I extend it to draw multi-lines ( i.e. 10 lines or 100 lines )

C++

Line V_Line = new Line();
V_Line.Stroke = System.Windows.Media.Brushes.Gray;
V_Line.StrokeThickness = 4;
V_Line.X1 = 0;
V_Line.Y1 = 0;
V_Line.X2 = New_Figure_Canvas.Width;
V_Line.Y2 = 0;

New_Figure_Canvas.Children.Add(V_Line);

Put it in a loop. This will draw 10 lines at 10 pixel intervals on your canvas:-

C#

for (int i = 0; i < 10; i++)
            {
                Line V_Line = new Line();
                V_Line.Stroke = System.Windows.Media.Brushes.Gray;
                V_Line.StrokeThickness = 4;
                V_Line.X1 = 0;
                V_Line.Y1 = i*10;
                V_Line.X2 = canvas1.Width;
                V_Line.Y2 = i*10;

                canvas1.Children.Add(V_Line);
            }

When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman

but if I increase the 10 to 100 then for 100 times I will make an instance of Line, is it optimal or there is another way ?!

That is how loops work. Smile | :)

Don't be afraid to try.

When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman

Thanks

I tried it before, but I was wondering if there is any better ( optimal ) way of doing this

As you are going to be composing a large(?) number of graphic objects, I would suggest that you look to use a geometry instead. Basically geometries inherit from Freezable, which means that they can be frozen, which helps to increase performance. The item you are looking for is the LineGeometry class.

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I have a collection of FolderModel and FileModel object. The FolderModel has 2 list properties holding FolderModels and FileModels. A folder can contain a list of Folders and/or a list of Files. It's populated like this:

RootFolder
   |_Folder_A
       |_ File_1
       |_ File_2
       |_ Folder_A1
           |_ File_5
           |_ File_6
           |_ Folder_A2
   |_Folder_B
       |_ File_3
       |_ File_4
       |_ Folder_B1

I'm trying display te data in a treeview. My templates are:

<HierarchicalDataTemplate DataType="{x:Type models:FolderModel}"
                            ItemsSource="{Binding Path=Folders}">
    <StackPanel Orientation="Horizontal" 
                Margin="2">
        <TextBlock Text="{Binding Path=Caption}"/>
    </StackPanel>
</HierarchicalDataTemplate>

<DataTemplate DataType="{x:Type models:FileModel}">
    <StackPanel Orientation="Horizontal"
                Margin="2">
        <TextBlock Margin="0,0,5,0">
            <Hyperlink NavigateUri="{Binding Caption}"
                        Foreground="#0C2DAA"
                        Command="{Binding SelectedLinkCommand}">
                <InlineUIContainer>
                    <TextBlock Text="{Binding Caption}" />
                </InlineUIContainer>

                <Hyperlink.Style>     
                    <Style TargetType="Hyperlink">       
                        <Style.Triggers>         
                            <Trigger Property="IsMouseOver" Value="False">
                                <Setter Property="TextDecorations" Value="{x:Null}" />         
                            </Trigger>       
                        </Style.Triggers>     
                    </Style>   
                </Hyperlink.Style> 

            </Hyperlink>
                    
        </TextBlock>

    </StackPanel>

</DataTemplate>

When I run it, all I see are the folders. The files are not showing up. What am I doing wrong?

Everything makes sense in someone's mind

The target objects need to be the same type. I use a UINode object that has all the properties needed to service a treeview node, Label, Tag and List<uinodes> being the minimum but I have order and image fields as well.

I then load the top nodes with the text I need to see and put the record (folder or file) object into the tag property (which is object).
Then for each top node I load the ChildNodes collection. This is a simple recursive excercise.

When I need to work with the content of the node I check the type of the object in the tag property first.