From List to Canvas

Hi All,
Just started out coding my first MIDP game and stumbled on a problem.
To offer the user a choice I can use a List. I know what to do to create the list and handle its events. But after the list, I want to switch to a canvas to display the game in. Where I can not wrap my mind around is how I go from my list to the Canvas.
Can anyone help me, or is this too cryptic?
maik

If I understand what you mean, you can change from the form to the canvas by just adding another setCurrent() command, like this
Form myListForm = new Form("This is the form with the list in in it");
Canvas myCanvas = new GameCanvas(true);
getDisplay().setCurrent(myListForm);
// when the user selects from the list...
getDisplay().setCurrent(myCanvas);is that what you meant? Or did you mean how to you detect and handle the user selecting from the list?

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Continuing from using a canvas in tab item

I asked about inserting a canvas into a tab item and ws given an answer which helped sort the problem , howvere i have hit another problem , the code is
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WPFDynamicTab
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
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        private TabItem _tabAdd;
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        private TabItem AddTabItem()
            int count = _tabItems.Count;
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            TabItem tab = new TabItem();
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            tab.Name = string.Format("tab{0}", count);
            tab.HeaderTemplate = tabDynamic.FindResource("TabHeader") as DataTemplate;
            // add controls to tab item, this case I added just a canvas
            Canvas canvas = new Canvas();
            canvas.Name = "canvas";
            Canvas canvas1 = new Canvas();
            canvas1.Name = "canvas1";
            // defining the background color of "canvas"
            switch (count)
                case 0:
                    canvas.Background = Brushes.Green;
                    break;
                case 1:
                    canvas.Background = Brushes.Red;
                    break;
                case 2:
                    canvas.Background = Brushes.Blue;
                    break;
                case 3:
                    canvas.Background = Brushes.Yellow;
                    break;
                case 4:
                    canvas.Background = Brushes.Brown;
                    break;
                case 5:
                    canvas.Background = Brushes.Orange;
                    break;
                case 6:
                    canvas.Background = Brushes.Olive;
                    break;
                default:
                    break;
            // Canvas_Paint defines the background color of "canvas1"
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
        //    tab.Content = canvas;     // ORIGINAL (commented out) to populate tab.Content with canvas
            Canvas_Paint();
            tab.Content = canvas1;      // NEW to populate tab.Content with canvas
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
            // insert tab item right before the last (+) tab item
            _tabItems.Insert(count - 1, tab);
            return tab;
        private void _tabAdd_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
            TabItem newTab = this.AddTabItem();
            // clear tab control binding
            tabDynamic.DataContext = null;
            // bind tab control
            tabDynamic.DataContext = _tabItems;
            tabDynamic.SelectedItem = newTab;
        private void Canvas_Paint()
            int count = _tabItems.Count;
            switch (count)
                case 0:
                    canvas1.Background = Brushes.Green;
                    break;
                case 1:
                    canvas1.Background = Brushes.Red;
                    break;
                case 2:
                    canvas1.Background = Brushes.Blue;
                    break;
                case 3:
                    canvas1.Background = Brushes.Yellow;
                    break;
                case 4:
                    canvas1.Background = Brushes.Brown;
                    break;
                case 5:
                    canvas1.Background = Brushes.Orange;
                    break;
                case 6:
                    canvas1.Background = Brushes.Olive;
                    break;
                default:
                    break;
        private void tabDynamic_SelectionChanged(object sender, SelectionChangedEventArgs e)
and the xml is
<Window x:Class="WPFDynamicTab.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Dynamic Tab" Height="300" Width="527" WindowStartupLocation="CenterScreen">
    <Grid>
        <TabControl Name="tabDynamic" ItemsSource="{Binding}" SelectionChanged="tabDynamic_SelectionChanged">
            <TabControl.Resources>
                <DataTemplate x:Key="TabHeader" DataType="TabItem">
                    <DockPanel>
                        <TextBlock Text="{Binding RelativeSource={RelativeSource AncestorType=TabItem }, Path=Header}" />
                    </DockPanel>
                </DataTemplate>
            </TabControl.Resources>
        </TabControl>
    </Grid>
</Window>
The problem is when i use the Canvas "canvas" with the canvas pouplated within the method all is ok , however using "canvas1" where canvas1 is populated in Canvas_Paint
"canvas1" has null entries. How can I set the background colour in the tab using Canvas_Paint. Can the canvs be put in the XML? I hve simplified the problem from a much more complicated one in order to highlight the problem
steve

>>I asked about inserting a canvas into a tab item and ws given an answer which helped sort the problem , howvere i have hit another problem , the code is
Please close your previous threads by marking helpful posts as answer before starting a new one. And please only ask one question per thread.
>>How can I set the background colour in the tab using Canvas_Paint?
You never set the Background of the canvas1 that you create in the AddTabItem() and use as the Content of the TabItem. Just remove this line from this method:
Canvas canvas1 = new Canvas();
...and you will see the background:
private TabItem AddTabItem()
int count = _tabItems.Count;
// create new tab item
TabItem tab = new TabItem();
tab.Header = string.Format("Tab {0}", count);
tab.Name = string.Format("tab{0}", count);
tab.HeaderTemplate = tabDynamic.FindResource("TabHeader") as DataTemplate;
// add controls to tab item, this case I added just a canvas
Canvas canvas = new Canvas();
canvas.Name = "canvas";
canvas1.Name = "canvas1";
// defining the background color of "canvas"
switch (count)
case 0:
canvas.Background = Brushes.Green;
break;
case 1:
canvas.Background = Brushes.Red;
break;
case 2:
canvas.Background = Brushes.Blue;
break;
case 3:
canvas.Background = Brushes.Yellow;
break;
case 4:
canvas.Background = Brushes.Brown;
break;
case 5:
canvas.Background = Brushes.Orange;
break;
case 6:
canvas.Background = Brushes.Olive;
break;
default:
break;
// Canvas_Paint defines the background color of "canvas1"
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
//tab.Content = canvas; // ORIGINAL (commented out) to populate tab.Content with canvas
Canvas_Paint();
tab.Content = canvas1; // NEW to populate tab.Content with canvas
// XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
// insert tab item right before the last (+) tab item
_tabItems.Insert(count - 1, tab);
return tab;
Another approach bay be to pass the Canvas element to the painted to the Canvas_Paint() method by reference instead of using a class-level field:
Canvas_Paint(ref canvas1);
tab.Content = canvas1;
private void Canvas_Paint(ref Canvas canvas1)
int count = _tabItems.Count;
switch (count)
case 0:
canvas1.Background = Brushes.Green;
break;
case 1:
canvas1.Background = Brushes.Red;
break;
case 2:
canvas1.Background = Brushes.Blue;
break;
case 3:
canvas1.Background = Brushes.Yellow;
break;
case 4:
canvas1.Background = Brushes.Brown;
break;
case 5:
canvas1.Background = Brushes.Orange;
break;
case 6:
canvas1.Background = Brushes.Olive;
break;
default:
break;
Please remember to close your threads by marking helpful posts as answer and please start a new thread if you have a new question.

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sudhanshu sharma Do good and cast it into river :)

Hi,
From your description, you want to add a help link(read data from other list) into new form page.
The following code for your reference:
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var list= context.get_web().get_lists().getByTitle("configurationList");
var camlQuery= new SP.CamlQuery();
camlQuery.set_viewXml("<View><Query><Where><Eq><FieldRef Name='Title'/><Value Type='Text'>Help</Value></Eq></Where></Query></View>");
this.listItems = list.getItems(camlQuery);
context.load(this.listItems,'Include(Title,URL)');
context.executeQueryAsync(function(){
var ListEnumerator = listItems.getEnumerator();
while(ListEnumerator.moveNext())
var currentItem = ListEnumerator.get_current();
var title=currentItem.get_item("Title");
var url=currentItem.get_item("URL").get_url();
var HelpLinkhtml ='<a href="'+url+'">'+title+'</a>';
$("input[value='Cancel']").parent("td").addClass('ms-separator').append(HelpLinkhtml);
},function(sender,args){
alert(args.get_message());
</script>
Result:
Best Regards
Dennis Guo
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