by Brian Keating
Thu, June 03 2010 16:43
Ever wondered how to display the correct cursor in an application that is databinded to async methods?
Pretty easy solution, just databind the cursor on the window itself.
Here's how:
- Add an IsBusy property on the DataContext (and implement INotifyPropertyChanged on it)
- Addt the following to your window xaml
xmlns:valueConverters="clr-namespace:XXX.ValueConverters"
Cursor="{Binding IsBusy, Converter={valueConverters:CursorExtensionConverter}}"
- Create the following ValueConverter
public class CursorExtensionConverter : MarkupExtension, IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value != null && ((bool)value))
return Cursors.Wait;
else
return Cursors.Arrow;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
return instance;
}
private static CursorExtensionConverter instance = new CursorExtensionConverter();
}
Note: Use of MarkupExtension
by Brian Keating
Wed, May 12 2010 10:44
If you're interested to see how to attach commands to listview items for use with an implementation of the MVVM pattern, have a look at this.
<Style x:Key="Local_OpenEntityStyle"
TargetType="{x:Type ListViewItem}">
<Setter Property="acb:CommandBehavior.Event"
Value="MouseDoubleClick" />
<Setter Property="acb:CommandBehavior.Command"
Value="{Binding ElementName=uiEntityListDisplay, Path=DataContext.OpenEntityCommand}" />
<Setter Property="acb:CommandBehavior.CommandParameter"
Value="{Binding}" />
</Style>
Here the command to be fired on the MouseDoubleClick event is set, the CommandParameter, will be the data object that we click on.
59f0a853-441b-4095-bf1d-6ceba053a1ad|1|1.0
Tags:
WPF | MVVM
by Brian Keating
Wed, March 24 2010 21:27
I'm really loving this declarative approach with silverlight and wpf... (ask me why and I can't tell you ! :-)
Anyway I've just stumbled across a way of managing RiaDataContexts Declaratively
I found it on the Telerik samples.... If you've not looked at these guys controls then check them out!!
<navigation:Page xmlns:dataFormToolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.DataForm.Toolkit" xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
x:Class="SiteDocs.Loler"
xmlns="//schemas.microsoft.com/winfx/2006/xaml/presentation">http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"
xmlns:riaControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Ria"
xmlns:e="clr-namespace:SiteDocs.Web.Services"
xmlns:riaData="clr-namespace:System.Windows.Data;assembly=System.Windows.Controls.Ria"
mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480"
Style="{StaticResource PageStyle}"
>
<Grid x:Name="LayoutRoot" >
<ScrollViewer x:Name="PageScrollViewer" Style="{StaticResource PageScrollViewerStyle}" >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid x:Name="gridLolerLeft" >
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<riaControls:DomainDataSource x:Name="DomainDataSource1" AutoLoad="True" QueryName="GetLolers" PageSize="10">
<riaControls:DomainDataSource.DomainContext>
<e:LolerContext />
</riaControls:DomainDataSource.DomainContext>
<riaControls:DomainDataSource.FilterDescriptors>
<riaData:FilterDescriptorCollection LogicalOperator="Or" />
</riaControls:DomainDataSource.FilterDescriptors>
</riaControls:DomainDataSource>
<telerik:RadGridView x:Name="RadGridView1" ItemsSource="{Binding Data, ElementName=DomainDataSource1}"
Filtering="RadGridView1_Filtering" IsBusy="{Binding IsBusy, ElementName=DomainDataSource1}" />
<telerik:RadDataPager x:Name="RadDataPager1" Grid.Row="1" Source="{Binding Data, ElementName=DomainDataSource1}" DisplayMode="FirstLastPreviousNextNumeric, Text" IsTotalItemCountFixed="True"/>
</Grid>
</Grid>
</ScrollViewer>
</Grid>
</navigation:Page>
by Brian Keating
Wed, March 17 2010 17:14
Here is come code to show a popup in wpf, i've nothing in the popup at the moment, just a gradient background and border.
<Popup Name="popup1"
Width="{Binding ElementName=bdrCalendar, Path=ActualWidth, Converter={StaticResource MarginValueConverter}}"
Height="150"
Placement="Center"
PopupAnimation="Scroll"
AllowsTransparency="True"
PlacementTarget="{Binding ElementName=bdrCalendar}"
MouseDown="popup1_MouseDown" >
<ctrls:PopupContent />
</Popup>
8e6c93ee-a598-48bc-9a43-85556bb1a6d1|0|.0
Tags:
WPF
by Brian Keating
Sat, March 06 2010 18:23
Ever want to filter data in Silverlight? here's a simple example that uses a lambda expression to search on name (case sensitive)
ComboBox cbx = ((ComboBox)sender);
ICollectionView dataView =
CollectionViewSource.GetDefaultView(this.DataContext);
if (!string.IsNullOrEmpty(cbx.Text))
dataView.Filter = f => ((Job)f).Name.Contains(cbx.Text);
else
dataView.Filter = null;
by Brian Keating
Tue, March 02 2010 21:44
Tonight I tried to use the FlowDocument that you'll know well if you are familiar with WPF....
Important part above "tried to use" .... but ... silverlight version 3 doesn't support it :-(
Thats a second thing I've found lacking as I move some code to Silverlight, i've also found that DataTriggers don't work like the do in WPF 
by Brian Keating
Thu, February 25 2010 22:01
In my early WPF days I noticed the magic that having two different controls bound to the Same ObservableCollection meant that when I selected an item in one control, the same item got selected in the other.... which i I didn't want.
CollectionViewSource To the rescue
<Window.Resources>
<local:MyData x:Key="MyData"/>
<CollectionViewSource x:Key="AllData" Source="{StaticResource MyData}"/>
<CollectionViewSource x:Key="SearchData" Source="{StaticResource MyData}" Filter="MySearch"/>
</Window.Resources>
<ListBox ItemsSource="{Binding Source={StaticResource AllData}}"/>
<ListBox ItemsSource="{Binding Source={StaticResource SearchData}}"/>
by Brian Keating
Tue, February 23 2010 13:42
Here's how to ensure that databinding happens when the value of a textbox changes. (as apposed to loosing forcus for example)
<TextBox Text="{Binding Interval, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
a8c8d593-d79c-4abc-9808-b1447aa104ac|0|.0
Tags:
WPF
by Brian Keating
Wed, February 17 2010 19:47
Here's a bit of code that i'm using in an application to give this result (Checked GroupBox)
<GroupBox Grid.Row="3" Grid.Column="1" BorderBrush="Black" Margin="0,0,116,0">
<GroupBox.Header>
<CheckBox x:Name="cbValidity" IsChecked="{Binding Path=HasValidity}" >Validity</CheckBox>
</GroupBox.Header>
<StackPanel>
<StackPanel.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding ="{Binding ElementName=cbValidity, Path=IsChecked}" Value="false">
<Setter Property="Button.IsEnabled" Value="false"/>
</DataTrigger>
</Style.Triggers>
</Style>
</StackPanel.Style>
<TextBlock Margin="10,10,0,0" Text="This job is valid from" />
<wfi:WindowsFormsHost x:Name="propertiesCtrlHost" SnapsToDevicePixels="True" Background="Transparent" Height="22" Margin="10" Width="200" HorizontalAlignment="Left">
<wf:DateTimePicker x:Name="dtpFrom" Format="Custom" CustomFormat="dd MMMM yyyy HH:mm" ValueChanged="dtpFrom_ValueChanged" />
</wfi:WindowsFormsHost>
<TextBlock Margin="10,10,0,0" Text="This job is valid to" />
<wfi:WindowsFormsHost SnapsToDevicePixels="True" Background="Transparent" Height="22" Margin="10" Width="200" HorizontalAlignment="Left">
<wf:DateTimePicker x:Name="dtpTo" Format="Custom" CustomFormat="dd MMMM yyyy HH:mm" ValueChanged="dtpTo_ValueChanged" />
</wfi:WindowsFormsHost>
</StackPanel>
</GroupBox>
by Brian Keating
Fri, January 29 2010 09:44
Pretty cool app to pass a minute or so http://chriscavanagh.wordpress.com/
69dd4775-4ee6-44f7-814d-7dda1d91394c|0|.0
Tags:
WPF