I want to implement a ListView that loads new content when is scrolled (it will have over 2000 elements) with a scrollbar. This is what I have:
<ListView
Width="500"
MaxHeight="400"
IsItemClickEnabled = "False"
SelectionMode ="None"
IncrementalLoadingThreshold="5"
IncrementalLoadingTrigger="Edge"
ScrollViewer.VerticalScrollBarVisibility="Visible"
ScrollViewer.VerticalScrollMode="Enabled"/>
The list works perfectly fine but the scrollbar is not visible. How can I make it work?
there is another way to go.
you can use "ScrollViewer" and "Stackpanel" as main content of "ScrollViewer".
then set the "Orientation". finally add list itmes as childrens of "Stackpanel"
please take a look at sample:
<ScrollViewer
Width="500"
MaxHeight="400"
VerticalScrollBarVisibility="Visible"
VerticalScrollMode="Enabled"
>
<StackPanel Orientation="Vertical" SizeChanged="items_modified_event">
<ListViewItem Content="item1" />
<ListViewItem Content="item2" />
<ListViewItem Content="item3" />
<ListViewItem Content="item4" />
.
.
.
.
</StackPanel>
</ScrollViewer>
The problem was with a fixed with. After removing it, the scrollbar is visible.
Related
I have a ListView that uses a custom ItemTemplate (doesn't everyone?):
<ListView>
<!-- ... -->
<ListView.ItemTemplate>
<DataTemplate x:DataType="x:String">
<MyGreatControl Thing="{x:Bind}" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
MyGreatControl today has extensive keyboard handling code built-in, but due to some refactoring, I need to move the actual handlers to the ListView itself. However, I don't want to move all of the code in MyGreatControl to the ListView (for many reasons).
If I have an arbitrary ListViewItem (which, for example, I can get from an event handler), how can I access the MyGreatControl instance in its DataTemplate?
MyGreatControl^ GetMyGreatControlFromListViewItem(ListViewItem^ listViewItem) {
// ???
}
Disclaimer: I work for Microsoft.
You want to use ContentTemplateRoot!
MyGreatControl^ GetMyGreatControlFromListViewItem(ListViewItem^ listViewItem) {
return safe_cast<MyGreatControl^>(listViewItem->ContentTemplateRoot);
}
This also works for any arbitrary element—if you have a StackPanel, for example, ContentTemplateRoot will return the StackPanel instance you want:
<ListView.ItemTemplate>
<DataTemplate x:DataType="x:String">
<StackPanel><!-- This is what you get! -->
<TextBlock Text="{x:Bind}" />
<Button Content="Foo" IsTabStop="False" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
You can then use normal visual tree navigation to find Children, etc.
I am following Microsoft's documentation to implement a TreeView in a Universal Windows Platform app in C++. I have successfully been able to create a tree view with one node using the following codes:
XAML:
<TreeView x:Name="treeSolution"></TreeView>
C++:
TreeViewNode ^treeNode = ref new TreeViewNode();
treeNode->Content = "Hello";
treeSolution->RootNodes->Append(treeNode);
Now, I want to set the text to bold. I tried the following:
TextBlock ^textBlock = ref new TextBlock();
textBlock->Text = "Hello";
textBlock->FontWeight = Windows::UI::Text::FontWeights::Bold;
treeNode->Content = textBlock;
treeSolution->RootNodes->Append(treeNode);
The code displays Windows.UI.Xaml.Controls.TextBlock instead of Hello in bold.
The documentation says that In Windows 10, version 1803, you have to retemplate the TreeView control and specify a custom ItemTemplate if your content is not a string. It then gives a complex example using the Music and Picture library.
Could somebody provide a simple example of how to display the text in bold? Thanks.
You have to provide a custom style for the whole control in XAML to be able to set the TreeViewItemDataTemplate:
<DataTemplate x:Key="TreeViewItemDataTemplate">
<Grid Height="44">
<TextBlock
Text="{Binding Content}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Style="{ThemeResource BodyTextBlockStyle}"
FontWeight="Bold" />
</Grid>
</DataTemplate>
<Style TargetType="TreeView">
<Setter Property="IsTabStop" Value="False" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TreeView">
<TreeViewList x:Name="ListControl"
ItemTemplate="{StaticResource TreeViewItemDataTemplate}"
ItemContainerStyle="{StaticResource TreeViewItemStyle}"
CanDragItems="True"
AllowDrop="True"
CanReorderItems="True">
<TreeViewList.ItemContainerTransitions>
<TransitionCollection>
<ContentThemeTransition />
<ReorderThemeTransition />
<EntranceThemeTransition IsStaggeringEnabled="False" />
</TransitionCollection>
</TreeViewList.ItemContainerTransitions>
</TreeViewList>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Hope you could help me with something I'm not getting any results on Google. I have my MainPage.xaml which has a button inside a Hamburger menu. When I click this button I want to be able to open BlankPage.xaml inside a SplitView in MainPage.xaml but as a closable tab. The only reference I have is this picture. this picture
Note the red circle is what I want to be able to do. And note I am using C++.
Thanx in advance.
[Edit] I decided to go for a StackPanel which contains another StackPanel with 2 buttons. One button to open the tab and another to close is completely.
<StackPanel x:Name="TabPanel" Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Top" Width="1450" Height="26" Margin="50 40 0 0">
<StackPanel x:Name="PageTab1" Orientation="Horizontal" HorizontalAlignment="Left">
<Button x:Name="TabNameBtn" Content="Tab1" FontSize="11" Foreground="Black" BorderThickness="0" HorizontalAlignment="Left" VerticalAlignment="Center" Height="26" Margin="0 0 0 0"/>
<Button x:Name="TabCloseBtn" FontFamily="Segoe MDL2 Assets" Content="" FontWeight="ExtraLight" FontSize="10" Foreground="Black" BorderThickness="1" HorizontalAlignment="Right" VerticalAlignment="Center" Height="26" Width="26" Margin="0 0 0 0"/>
</StackPanel>
</StackPanel>
How do I add another "PageTab1" (Incremented as "PageTab2, "PageTab3"...) to "TabPanel" with c++ code when a button is pressed?
I'm trying to add a custom Scroller.as (extended from spark.components.Scroller) to a InfiniteScrollList.as (extended from spark.components.list)
I wrote the following MXML code:
<list:InfiniteScrollList width="100%" height="100%" id="EventsList" useVirtualLayout="true">
<list:scroller>
<list:Scroller/> <!-- The Scroller.as Class -->
</list:scroller>
</list:InfiniteScrollList>
The List behavior works well but the extended Scroller component does not function at all.
What is the correct way to add this scroller functionality (in MXML or ActionScript) to the list?
The s:Scroller is used by wrapping it around the content or DataGroup. But the List class wraps all that functionality inside of it's skin, so I believe that in order to create a custom Scroller for a List, you actually need to do within the SkinClass.
<list:InfiniteScrollList width="100%" height="100%" id="EventsList"
useVirtualLayout="true" skinClass="MyListSkin" />
MyListSkin.mxml:
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:fb="http://ns.adobe.com/flashbuilder/2009" minWidth="112">
<fx:Metadata>
[HostComponent("spark.components.Scroller")]
</fx:Metadata>
<s:states>
<s:State name="normal" />
<s:State name="disabled" />
</s:states>
<!-- The Scroller.as Class -->
<list:Scroller left="0" top="0" right="0" bottom="0" id="scroller" hasFocusableChildren="false">
<!--- #copy spark.components.SkinnableDataContainer#dataGroup -->
<s:DataGroup id="dataGroup" itemRenderer="spark.skins.spark.DefaultItemRenderer">
<s:layout>
<!--- The default layout is vertical and measures at least for 5 rows.
When switching to a different layout, HorizontalLayout for example,
make sure to adjust the minWidth, minHeight sizes of the skin -->
<s:VerticalLayout gap="0" horizontalAlign="contentJustify" requestedMinRowCount="5" />
</s:layout>
</s:DataGroup>
</list:Scroller/>
</s:SparkSkin>
I have two list that consist out of the same object.
I want to check if the first list containts an object of the second list
<ui:repeat var="item" value="#{userTypeController.permissionItems}">
<c:if test="#{userTypeController.permissionItemsUserType.contains(item)}">
<h:selectBooleanCheckbox value="#{true}"/>
<h:outputText value="#{item.getAction()}" />
</c:if>
<c:if test="#{!userTypeController.permissionItemsUserType.contains(item)}">
<h:selectBooleanCheckbox value="#{false}"/>
<h:outputText value="#{item.getAction()}" />
</c:if>
</ui:repeat>
but this doesn't seem to work and all I'm getting is false.
I've changed the equals and hashcode methodes but didn't help.
JSTL tags like <c:if> runs during view build time and the result is JSF components only. JSF components runs during view render time and the result is HTML only. They do not run in sync. JSTL tags runs from top to bottom first and then JSF components runs from top to bottom.
In your case, when JSTL tags runs, there's no means of #{item} anywhere, because it's been definied by a JSF component, so it'll for JSTL always be evaluated as if it is null. You need to use JSF components instead. In your particular case a <h:panelGroup rendered> should do it:
<ui:repeat var="item" value="#{userTypeController.permissionItems}">
<h:panelGroup rendered="#{userTypeController.permissionItemsUserType.contains(item)}">
<h:selectBooleanCheckbox value="#{true}"/>
<h:outputText value="#{item.getAction()}" />
</h:panelGroup>
<h:panelGroup rendered="#{!userTypeController.permissionItemsUserType.contains(item)}">
<h:selectBooleanCheckbox value="#{false}"/>
<h:outputText value="#{item.getAction()}" />
</h:panelGroup>
</ui:repeat>
See also:
JSTL in JSF2 Facelets... makes sense?