I have a grid inside a CollectionView and I need to change the layout based on a certain condition, changing dynamically the size of the columns and rows and hiding/showing some specific columns.
The datasource of the collectionView is always the same.
Basically, I want to achieve something like this:
Default layout:
Alternative layout:
I saw that maybe I could use the DataTemplateSelectors, but is that the best way or is there another method?
You can use the Grid in the Collectionview and set the Grid format.
First, you can set the CollectionView ItemsLayout. Here is the example.
<CollectionView ItemsSource="{Binding Items}"
ItemsLayout="VerticalGrid, 3">
it will divide the CollectionView list into three vertical parts.
Second, you can make a Grid to preserve the data.
<Grid Padding="10">
<Grid.RowDefinitions>
<RowDefinition Height="60" />
<RowDefinition Height="35" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="70" />
</Grid.ColumnDefinitions>
<Image Grid.Row="0"
Source="{Binding ImageUrl}"
Aspect="AspectFill"
HeightRequest="60"
WidthRequest="60" />
<Label Grid.Row="1"
Text="{Binding Location}" />
</Grid>
Related
in my XAML I have this grid:
<Grid Grid.Row="12" Grid.Column="1" ColumnSpacing="0" >
<Grid.RowDefinitions>
<RowDefinition Height="*"></RowDefinition>
<!--Label-->
<RowDefinition Height="3*" ></RowDefinition>
<!--ProfilePic-->
<RowDefinition Height="*"></RowDefinition>
<!-- Btn change-->
</Grid.RowDefinitions>
<BoxView BackgroundColor="Purple" Grid.Row="1"></BoxView>
<ImageButton
Grid.Row="2"
x:Name="row_forpic_editProfile"
HorizontalOptions="Center"
VerticalOptions="Center"
/>
<Label
Grid.Row="0"
FontSize="16"
TextColor="#272727"
VerticalOptions="End"
Text="Proilfbild"
FontFamily="arial"
/>
<Button
Grid.Row="2"
x:Name="btn_changepic_editprofile"
Text="Ändern"
HorizontalOptions="Center"
VerticalOptions="Center"
/>
</Grid>
This is the result of that:
The result
Now, I want to add an imageview into the purple row (which is Grid.Row="1") from code because I downloaded a picture from the internet.
How can I now add my new Image (ImageButton) into this exact row? (row 1)
And also have it maintain its dimensions (only the picture must full the container).
thank you:)
to add a View to a Grid
myGrid.Children.Add(view,col,row);
I have no idea what I'm doing wrong here. I've tried explicitly setting heights, column definitions, but I cannot get the sizing here to be correct.
I tried setting two columns with one row, with and without explicit heights and sizes.
What do I have to do?
something like this should work
<ViewCell>
<!-- need to specify an overall height -->
<Grid HeightRequest="200">
<Grid.RowDefinitions>
<!-- two rows equal height -->
<RowDefinition Height="50*" />
<RowDefinition Height="50*" />
</Grid.RowDefinitions>
<Grid.ColumnDefintions>
<!-- two cols equal width -->
<ColumnDefintions Width="50*" />
<ColumnDefintions Width="50*" />
</Grid.ColumnDefinitions>
<Label Grid.Row="0" Grid.Column="0" Text="Location" />
<Label Grid.Row="0" Grid.Column="1" Text="Amount" />
<Label Grid.Row="1" Grid.ColumnSpan="2" Text="Created" />
</Grid>
</ViewCell>
I have a grid with the following row definitions...
<Grid.RowDefinitions>
<RowDefinition Height="5*" />
<RowDefinition Height="Auto" />
<RowDefinition Height="2*" />
</Grid.RowDefinitions>
When the user presses a button, how do I remove the bottom two rows and have the top row (including the view within it) stretch to the bottom of the grid?
I kept all the rows and did this...
mainGrid.RowDefinitions[2].Height = new GridLength(1, GridUnitType.Star);
mainGrid.ForceLayout();
I would like to animate the change in height.
Try something like this:
The grid
<Grid x:Name="grid">
<Grid.RowDefinitions>
<RowDefinition Height="5*" />
<RowDefinition Height="Auto" />
<RowDefinition Height="2*" />
</Grid.RowDefinitions>
<StackLayout Grid.Row="0"
HorizontalOptions="FillAndExpand"
VerticalOptions="FillAndExpand"
x:Name="stkOne"
BackgroundColor="Red"/>
<StackLayout Grid.Row="1"
HorizontalOptions="FillAndExpand"
VerticalOptions="FillAndExpand"
x:Name="stkTwo"
BackgroundColor="Green"/>
<StackLayout Grid.Row="1"
HorizontalOptions="FillAndExpand"
VerticalOptions="FillAndExpand"
x:Name="stkThree"
BackgroundColor="Blue"/>
<Button Text="Expand One"
HorizontalOptions="EndAndExpand"
Command="ExpandCommand"/>
</Grid>
The code behind
// Create the command and set it up to execute this method:
void ExecuteExpand()
{
stkTwo.IsVisible=false;
stkThree.IsVisible=false;
Grid.SetRowSpan(stkOne, 3);
grid.ForceLayout();
}
I'm not sure if it will work as you need, but make a try.
I have loaded the views inside a grid as below,
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Entry x:Name="SearchTextBox"
Grid.Row="0"
HorizontalOptions="Fill"
Placeholder="Search"
VerticalOptions="Fill" />
<ListView x:Name="listView"
Grid.Row="1"
HorizontalOptions="Fill"
VerticalOptions="Fill" />
<local:CustomListView x:Name="customView"
Grid.Row="0"
ItemsSource="{Binding Items}">
</local:CustomListView >
</Grid>
Out of 3 views in the above code snippet, first two views are rendered properly. But the 3rd view(custom view) not rendered. CustomViews are not rendered only if I set RowDefinition as "Auto". So, anyone please tell why the custom view is not loaded if I set "Auto".
your CustomListView probably doesn't request a minimum size correctly, and as the middle row has a height of *, it takes all of the available space minus the minimum size requests.
When I am binding to a collection with a listbox, is there any way I can manage the output based upon the prior items that were displayed in the collection.
For example in the following binding
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ListBox x:Name="AgendaListbox"
ItemsSource="{Binding AgendaItems2}"
ItemTemplate="{StaticResource EventDisplay3}"/>
</Grid>
Where the Template is as follows
<DataTemplate x:Key="EventDisplay3">
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="10"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding DateTimeDayString}" Style="{StaticResource PhoneTextSmallStyle}"
Grid.Row="0" Grid.Column="0"/>
<TextBlock Text="{Binding DisplayTimeString}" Foreground="{Binding DisplayColor}"
Grid.Row="1" Grid.Column="0" Style="{StaticResource PhoneTextLargeStyle}"/>
<TextBlock Text="{Binding Details}" TextWrapping="Wrap" Style="{StaticResource PhoneTextNormalStyle}"
Grid.Row="0" FontSize="30" Grid.Column="2" Grid.RowSpan="3"
VerticalAlignment="Center" />
<TextBlock Text="{Binding Location}" Style="{StaticResource PhoneTextSmallStyle}"
Grid.Row="3" Grid.Column="0"/>
</Grid>
</DataTemplate>
If I want to alter the display based upon they previous item that was displayed (e.g say I want to drop the DateTimeString Binding if its identical to the previous one) is there a way that I can do it without having to make specific allowance for it when I build up the collecton.
Because so much happens automatically as it were with the listbox being bound to that collection I cannot see any other way without me handling this as the collection is being built... because after that I have little control.
Thanks
Is there any way I can manage the output based upon the prior items that were displayed in the collection?
No.
You have to do such changes when you build the collection. Consider if using a DataTemplateSelector can be of any help.