I need to access the mainpage values in usercontrols (child page) in windows 8 metro apps.Please let me know how to do this?
In child page i am trying to access the mainpage controls like this :
DealersPage main = new DealersPage();
Grid grd = main.FindName("visibleGrid") as Grid;
grd.Visibility = Visibility.Collapsed;
But no luck !!!Please tell me
EDIT:In Child Page(usercontrol) on image tapped event i wrote below code.
private void imgClose_Tapped(object sender, TappedRoutedEventArgs e)
{
DealersPage main = this.Parent as DealersPage;
if (main != null)
{
Grid grd = main.FindName("visibleGrid") as Grid;
grd.Visibility = Visibility.Collapsed;
}
settingsControl.Visibility = Visibility.Collapsed;
}
in MainPage (DealersPage) my design like this:
<Grid HorizontalAlignment="Left" Height="758" Margin="0,10,0,0" VerticalAlignment="Top" Width="1366" x:Name="visibleGrid" Opacity="0.85" Background="#FF858585">
<Grid HorizontalAlignment="Left" Height="600" Margin="454,108,0,0" Visibility="Collapsed" VerticalAlignment="Top" Width="500" x:Name="gridpopup">
<local:Settings x:Name="SettingsUsercontrol" Visibility="Collapsed" Height="600" Width="500"/>
</Grid>
</Grid>
From your code, you are NOT actually accessing the main page control in which the user control is present. By using new DealersPage() you are actually creating a new instance of the DealersPage (your main page) on which FindName might return the grid; but that will never be the one that you actually would be looking for.
Your main should be something like (DealersPage)this.Parent which would be the actual parent page.
CODE: Somewhere in your UserControl -
DealersPage main = this.Parent as DealersPage;
if(main != null)
{
Grid grd = main.FindName("visibleGrid") as Grid;
grd.Visibility = Visibility.Collapsed;
}
Related
Yes, i have googled for it, this solution doesn't do the trick:
Disable navigation on FlipView
Because i want to remain changing items with animations, but only programmatically.
I have investigated the FlipView template and found that all interactions/animations etc. are built using the ScrollingHost by name:
<ScrollViewer x:Name="ScrollingHost" AutomationProperties.AccessibilityView="Raw" BringIntoViewOnFocusChange="{TemplateBinding ScrollViewer.BringIntoViewOnFocusChange}" HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}" HorizontalSnapPointsType="MandatorySingle" HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}" IsTabStop="False" IsHorizontalRailEnabled="{TemplateBinding ScrollViewer.IsHorizontalRailEnabled}" IsHorizontalScrollChainingEnabled="{TemplateBinding ScrollViewer.IsHorizontalScrollChainingEnabled}" IsVerticalScrollChainingEnabled="{TemplateBinding ScrollViewer.IsVerticalScrollChainingEnabled}" IsVerticalRailEnabled="{TemplateBinding ScrollViewer.IsVerticalRailEnabled}" IsDeferredScrollingEnabled="{TemplateBinding ScrollViewer.IsDeferredScrollingEnabled}" Padding="{TemplateBinding Padding}" TabNavigation="{TemplateBinding TabNavigation}" VerticalSnapPointsType="MandatorySingle" VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}" VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}" ZoomMode="Disabled">
<ItemsPresenter/>
</ScrollViewer>
So, i have created a custom class MyFlipView and derivered from FlipView, and overrided MouseWheel ( this gives me the needed behavior on desktop ), and deleted navigation buttons from template ( this also limits user interactions ). But the only thing that remains, user is still able to drag the items by pointer ( tablets, phones, maybe even PC with touch screens ). here is my code:
public class MyFlipView : FlipView
{
ScrollViewer scroll;
public MyFlipView()
{
}
protected override void OnApplyTemplate()
{
base.OnApplyTemplate();
scroll = GetTemplateChild("ScrollingHost") as ScrollViewer;
scroll.HorizontalScrollMode = ScrollMode.Disabled;
scroll.VerticalScrollMode = ScrollMode.Disabled;
scroll.VerticalScrollBarVisibility = ScrollBarVisibility.Disabled;
scroll.HorizontalScrollBarVisibility = ScrollBarVisibility.Disabled;
scroll.IsHorizontalRailEnabled = false;
scroll.IsVerticalRailEnabled = false;
scroll.IsVerticalScrollChainingEnabled = false;
scroll.IsHorizontalScrollChainingEnabled = false;
scroll.IsHoldingEnabled = false;
}
protected override void OnPointerWheelChanged(PointerRoutedEventArgs e)
{
e.Handled = true;
//base.OnPointerWheelChanged(e);
}
}
As you can see i tried do disable all the scrolling in the ScrollingHost, but still it is possible to switch items on touchscreens. How can i disable them also?
Set the FlipView's IsHitTestVisible property to false.
Then set KeyboardNavigation.DirectionalNavigation to none
Which is basically saying "You can't touch me or tab to me"
Thomas Schneiter's answer would still allow it to be reached via tabbing / other buggy methods of navigation.
If you don't need any interaction with the FlipView, an easy but... well kinda ugly solution is to put a (almost) transparent rectangle on top of your FlipView.
<Grid>
<FlipView ... />
<Rectangle Fill="White" Opacity="0.01" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
</Grid>
Over a year later and still no good solution for disabling FlipView's. Here's what I ended up doing which seems to do the trick without having to create a new FlipView control.
Edit the ControlTemplate and remove all the navigation buttons. Add a transparent background to you DataTemplate container. Add a PointerWheelChanged event handler to the DataTemplate container and have it set e.Handled = true;. Finally, add a SelectionChanged event handler to the FlipView and have it reset the selected item back to the original.
XAML
<FlipView x:Name="MyFlipView" ItemsSource="{x:Bind Items,Mode=OneWay}" SelectionChanged="FlipView_SelectionChanged">
<FlipView.ItemTemplate>
<DataTemplate>
<Grid Background="Transparent" PointerWheelChanged="Item_PointerWheelChanged">
<!--You Item XAML-->
</Grid>
</DataTemplate>
</FlipView.ItemTemplate>
<FlipView.Template>
<ControlTemplate TargetType="FlipView">
<Grid>
<!--Default ScrollViewer settings omitted, but no changes needed-->
<ScrollViewer>
<ItemsPresenter />
</ScrollViewer>
</Grid>
</ControlTemplate>
</FlipView.Template>
</FlipView>
Code Behind
private bool _isDisabled;
private object _selectedItem;
public ObservableCollection<object> Items { get; } = new ObservableCollection<object>();
//methods for setting Items, _isDisabled, and _selectedItem omitted
private void Item_PointerWheelChanged(object sender, PointerRoutedEventArgs e)
{
//this prevents the wheel from changing the items
e.Handled = _isDisabled;
}
private void FlipView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//Can't find a way to disable keyboard from changing items so we'll monitor the change and flip it back
if (_isDisabled)
{
this.SetupSelectedItem();
}
}
private void SetupSelectedItem()
{
//do a check here to prevent SelectionChanged events from firing.
if (this.MyFlipView.SelectedItem != _selectedItem)
{
this.MyFlipView.SelectedItem = _selectedItem;
}
}
UPDATE
Ok, TouchScreen was still having some problems so I took another stab at it. There are two levels we need to work on, the FlipViewItem and the FlipView. Unfortunately we have to sub-class these because there aren't any overrides we can do to interrupt the default behavior. I also wanted to use binding to be able to turn the flipping on or off. This only supports Horizontal orientation but can easily be adjusted to support Vertical.
Custom FlipViewItem is needed to control the mouse and keyboard.
public sealed class GalleryFlipViewItem : FlipViewItem
{
public bool IsFlipEnabled { get; set; }
protected override void OnKeyDown(KeyRoutedEventArgs e)
{
e.Handled = !this.IsFlipEnabled;
base.OnKeyDown(e);
}
protected override void OnPointerWheelChanged(PointerRoutedEventArgs e)
{
e.Handled = !this.IsFlipEnabled;
base.OnPointerWheelChanged(e);
}
}
Custom FlipView is needed to control the touch and trickle the setting to the custom FlipViewItem.
public sealed class GalleryFlipView : FlipView
{
public static readonly DependencyProperty IsFlipEnabledProperty =
DependencyProperty.Register("IsFlipEnabled", typeof(bool), typeof(GalleryFlipView), new PropertyMetadata(true, IsFlipEnabledChanged));
private static void IsFlipEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is GalleryFlipView control)
{
if (control.GetTemplateChild("ScrollingHost") is ScrollViewer scrollViewer)
{
scrollViewer.HorizontalScrollMode = control.IsFlipEnabled ? ScrollMode.Auto : ScrollMode.Disabled;
}
if (control.ContainerFromItem(control.SelectedItem) is GalleryFlipViewItem flipViewItem)
{
flipViewItem.IsFlipEnabled = control.IsFlipEnabled;
}
}
}
public bool IsFlipEnabled
{
get { return (bool)GetValue(IsFlipEnabledProperty); }
set { SetValue(IsFlipEnabledProperty, value); }
}
protected override DependencyObject GetContainerForItemOverride()
{
return new GalleryFlipViewItem
{
IsFlipEnabled = this.IsFlipEnabled
};
}
}
Now we need to add the styles for each of these controls. I just copied the default styles for FlipViewItem and FlipView. I made a small adjustment to the FlipView by removing the up/down buttons and added binding to control the left/right button's visibility. To do this, wrap the original button in a grid and then use a converter to convert the bool to a visibility enum.
<Grid HorizontalAlignment="Left" VerticalAlignment="Center" Visibility="{Binding IsFlipEnabled,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource BooleanToVisibleConverter}}">
<Button x:Name="PreviousButtonHorizontal" Height="36" IsTabStop="False" Template="{StaticResource HorizontalPreviousTemplate}" UseSystemFocusVisuals="False" Width="20" />
</Grid>
<Grid HorizontalAlignment="Right" VerticalAlignment="Center" Visibility="{Binding IsFlipEnabled,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource BooleanToVisibleConverter}}">
<Button x:Name="NextButtonHorizontal" Height="36" IsTabStop="False" Template="{StaticResource HorizontalNextTemplate}" UseSystemFocusVisuals="False" Width="20" />
</Grid>
Since IsFlipEnabled is a DependencyProperty you can use binding, xaml, or code behind to control it.
<controls:GalleryFlipView IsFlipEnabled="False">
Finally, this seems like the right solution. So frustrating we have to do so much work to simply turn this feature on and off.
I'm scruiggling with Windows Phone behavior. And maybe you could help me out somehow.
I want to have a listview from which I can drag items to another Gridview.
So far I got dragging enabled by setting ReorderMode = "Enabled". Doing this has some drawbacks.
1. I'm not able to scroll in my listview anymore
2. I can't select items anymore
3. I don't want the items to be reordered
What I want to have:
1. When holding an item, I want to drag this to another gridview
2. I want still be able to scroll in the listview
3. I still want to be able to select items
Is that somehow possible to do in Windows Phone 8.1?! Can I do my own dragging? Is yes, how should I start?!
Many thanks for any advise
ReorderMode isn't want you want in this case. Here's some basic functionality to do this between two ListViews:
<StackPanel Orientation="Horizontal" Width="800">
<ListView x:Name="ListView1" HorizontalAlignment="Left" DragItemsStarting="ListView_DragItemsStarting" AllowDrop="True" CanDragItems="True" CanReorderItems="True" Drop="ListView_Drop"/>
<ListView x:Name="ListView2" HorizontalAlignment="Right" DragItemsStarting="ListView_DragItemsStarting" AllowDrop="True" CanDragItems="True" CanReorderItems="True" Drop="ListView_Drop"/>
</StackPanel>
ObservableCollection<string> AlphabetList;
ObservableCollection<string> NumberList;
protected override void OnNavigatedTo(NavigationEventArgs e)
{
AlphabetList = new ObservableCollection<string>();
AlphabetList.Add("A");
AlphabetList.Add("B");
AlphabetList.Add("C");
AlphabetList.Add("D");
AlphabetList.Add("E");
AlphabetList.Add("F");
AlphabetList.Add("G");
AlphabetList.Add("H");
AlphabetList.Add("I");
AlphabetList.Add("J");
ListView1.ItemsSource = AlphabetList;
NumberList = new ObservableCollection<string>();
NumberList.Add("0");
NumberList.Add("1");
NumberList.Add("2");
NumberList.Add("3");
NumberList.Add("4");
NumberList.Add("5");
NumberList.Add("6");
NumberList.Add("7");
NumberList.Add("8");
NumberList.Add("9");
ListView2.ItemsSource = NumberList;
}
IList<object> DraggedItems;
private void ListView_DragItemsStarting(object sender, DragItemsStartingEventArgs e)
{
DraggedItems = e.Items;
}
private void ListView_Drop(object sender, DragEventArgs e)
{
ListView ThisListView = sender as ListView;
ObservableCollection<string> AddingOC = (ThisListView.Name == "ListView1" ? AlphabetList :NumberList);
ObservableCollection<string> RemovingOC = (ThisListView.Name == "ListView1" ? NumberList : AlphabetList);
if (AddingOC.Contains(DraggedItems[0])) return;
foreach (string O in DraggedItems)
{
RemovingOC.Remove(O);
AddingOC.Add(O);
}
}
I'm building a Windows Phone 8.1 Hub Application. One of the hub section contains a ListView that displays a list of articles. I'd like to add a Textblock to this hubsection which displays a message when the articles failed to download. The XAML Code is below:
<HubSection
x:Uid="ArticlesSection"
Header="ARTICLES"
DataContext="{Binding Articles}"
HeaderTemplate="{ThemeResource HubSectionHeaderTemplate}">
<DataTemplate>
<Grid>
<ListView
AutomationProperties.AutomationId="ItemListViewSection3"
AutomationProperties.Name="Items In Group"
SelectionMode="None"
IsItemClickEnabled="True"
ItemsSource="{Binding}"
ItemTemplate="{StaticResource BannerBackgroundArticleTemplate}"
ItemClick="ItemView_ItemClick"
ContinuumNavigationTransitionInfo.ExitElementContainer="True">
</ListView>
<TextBlock
x:Name="NoArticlesTextBlock"
HorizontalAlignment="Center"
VerticalAlignment="center"
Style="{StaticResource HeaderTextBlockStyle}"
TextWrapping="WrapWholeWords"
TextAlignment="Center"/>
</Grid>
</DataTemplate>
</HubSection>
The problem I'm having is that I can't access the TextBlock from the C# code. Is there an easier way to do this?
The problem I'm having is that I can't access the TextBlock from the C# code.
Yes, since the TextBlock is defined inside a DataTemplate, the TextBlock won't be available until the DataTemplate has been applied. Thus, the x:Name attribute won't automatically generate a variable reference in the InitializeComponent method in your *.g.i.cs file. (Read up on XAML Namescopes for more information).
If you want to access it from your code-behind, there are two ways:
The first way is the simplest: you can get a reference to the TextBlock in the sender argument of the Loaded event handler for that TextBlock.
<TextBlock Loaded="NoArticlesTextBlock_Loaded" />
Then in your code-behind:
private TextBlock NoArticlesTextBlock;
private void NoArticlesTextBlock_Loaded(object sender, RoutedEventArgs e)
{
NoArticlesTextBlock = (TextBlock)sender;
}
The second way is to traverse the visual tree manually to locate the element with the required name. This is more suitable for dynamic layouts, or when you have a lot of controls you want to reference that doing the previous way would be too messy. You can achieve it like this:
<Page Loaded="Page_Loaded" ... />
Then in your code-behind:
static DependencyObject FindChildByName(DependencyObject from, string name)
{
int count = VisualTreeHelper.GetChildrenCount(from);
for (int i = 0; i < count; i++)
{
var child = VisualTreeHelper.GetChild(from, i);
if (child is FrameworkElement && ((FrameworkElement)child).Name == name)
return child;
var result = FindChildByName(child, name);
if (result != null)
return result;
}
return null;
}
private TextBlock NoArticlesTextBlock;
private void Page_Loaded(object sender, RoutedEventArgs e)
{
// Note: No need to start searching from the root (this), we can just start
// from the relevant HubSection or whatever. Make sure your TextBlock has
// x:Name="NoArticlesTextBlock" attribute in the XAML.
NoArticlesTextBlock = (TextBlock)FindChildByName(this, "NoArticlesTextBlock");
}
Jerry Nixon has a good page on his blog about this.
I am making a Windows 8 application in visual studio 2012 c#.
I am having an image '1.png' and I want to rotate it at any angle as an animation along its center point.
But i want to do it with the help of c# code rather than XAML code.
Thank You in Advance.
In your XAML, have the following image:
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<Image Source="/Assets/Logo.png" Width="300" RenderTransformOrigin="0.5, 0.5">
<Image.RenderTransform>
<RotateTransform x:Name="rotateTransform"/>
</Image.RenderTransform>
</Image>
</Grid>
Then, in code, write the following when you want to animate (you create the Storyboard programmatically, then add to it a relevant Timeline. Note that you can also create the RotateTransform in code if you want.
async void MainPage_Loaded(object sender, RoutedEventArgs e)
{
await Task.Delay(500);
Storyboard board = new Storyboard();
var timeline = new DoubleAnimationUsingKeyFrames();
Storyboard.SetTarget(timeline, rotateTransform);
Storyboard.SetTargetProperty(timeline, "Angle");
var frame = new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromSeconds(1), Value = 360, EasingFunction = new QuadraticEase() { EasingMode = EasingMode.EaseOut } };
timeline.KeyFrames.Add(frame);
board.Children.Add(timeline);
board.Begin();
}
This will rotate the object 360 degrees.
BTW: I am writing a set of posts that show an even better way of animating. It's not done yet, but it will give you a general idea on how to get a framework for certain types of animations..
First part of the series
Thanks Shahar! I took your example and made a custom control. It's actually an infinite spinning of one ring image.
Spinner.xaml:
<UserControl x:Class="MyControls.Spinner"
...
<Grid >
<Image Source="/Assets/Images/spinner.png" Width="194" RenderTransformOrigin="0.5, 0.5">
<Image.RenderTransform>
<RotateTransform x:Name="rotateTransform"/>
</Image.RenderTransform>
</Image>
</Grid>
</UserControl>
Spinner.cs:
namespace MyControls
{
public partial class Spinner: UserControl
{
public Spinner()
{
InitializeComponent();
this.Loaded += Spinner_Loaded;
}
private void PlayRotation()
{
Storyboard board = new Storyboard();
var timeline = new DoubleAnimationUsingKeyFrames();
Storyboard.SetTarget(timeline, rotateTransform);
Storyboard.SetTargetProperty(timeline, new PropertyPath("(Angle)"));
var frame = new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromSeconds(5), Value = 360, EasingFunction = new QuadraticEase() { EasingMode = EasingMode.EaseOut } };
timeline.KeyFrames.Add(frame);
board.Children.Add(timeline);
board.RepeatBehavior = RepeatBehavior.Forever;
board.Begin();
}
private async void Spinner_Loaded(object sender, RoutedEventArgs e)
{
PlayRotation();
}
}
}
Then when you want to use Spinner in another xaml, it's very simple:
Just add a line for it inside any Grid etc:
<include:Spinner/>
(of course you need to define include as something like:
xmlns:include="MyControls"
on top of your xaml)
I want to implement auto-complete on a textbox in a Windows 8 UI / Metro UI app using C#/XAML.
At the moment, when the soft / touch keyboard shows, it obscures the auto-complete box. However, on the text box focus, Windows 8 automatically scrolls the entire view up and ensures the text box is in focus.
In reality, all I want is the view to scroll up a little more (in fact, by the height of the auto-complete box).
I realise I can intercept the Showing event of InputPane.GetForCurrentView()
I can set InputPaneVisibilityEventArgs.EnsuredFocusedElementInView to true inside the Showing event fine (so Windows won't try to do anything).... however, how can I invoke the same scrolling functionality that Windows 8 would do, but ask it to scroll a little more!?
Here's the code for the main page:
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<StackPanel VerticalAlignment="Center" HorizontalAlignment="Center" Margin="0,200,0,0">
<TextBlock HorizontalAlignment="Center" FontSize="60">App 1</TextBlock>
<TextBlock HorizontalAlignment="Center">Enter text below</TextBlock>
<TextBox HorizontalAlignment="Center" Margin="-10,0,10,0" Width="400" Height="30"/>
<ListBox HorizontalAlignment="Center" Width="400">
<ListBoxItem>Auto complete item 1</ListBoxItem>
<ListBoxItem>Auto complete item 2</ListBoxItem>
<ListBoxItem>Auto complete item 3</ListBoxItem>
<ListBoxItem>Auto complete item 4</ListBoxItem>
<ListBoxItem>Auto complete item 5</ListBoxItem>
</ListBox>
</StackPanel>
</Grid>
If you start up the simulator with the lowest resolution, use the hand to "touch" the textbox, this will bring up the soft keyboard. In the real app, the auto complete list will appear with items as the user enters text.
So in a nutshell, how can I move the screen up a bit more so the user can see the entire autocomplete list?
Bear in mind, in the real app, it'll be worse, as the user may not even notice the autocomplete list appearing "underneath" the keyboard.
I really would appreciate some advice, many thanks!
I have created an AutoCompleteBox for Windows Store apps, the nuget package is available at https://nuget.org/packages/AutoCompleteBoxWinRT
Ok, here is how I would tackle this since I cannot seem to find any way to control the scrolling of the app based on the appearance of the keyboard. I would create a user control that would form the basis for the auto-complete textbox.
<UserControl
x:Class="App6.MyUserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App6"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="400">
<Grid>
<TextBox x:Name="textBox" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" GotFocus="textBox_GotFocus" LostFocus="textBox_LostFocus" />
<ListBox x:Name="listBox" Height="150" Margin="0,-150,0,0" VerticalAlignment="Top" Visibility="Collapsed"/>
</Grid>
This is an incredibly basic implementation, so you will have to tweak to meet your needs.
Then, I would add the following code-behind to the user control
public sealed partial class MyUserControl1 : UserControl
{
// Rect occludedRect;
bool hasFocus = false;
public MyUserControl1()
{
this.InitializeComponent();
InputPane.GetForCurrentView().Showing += MyUserControl1_Showing;
}
void MyUserControl1_Showing(InputPane sender, InputPaneVisibilityEventArgs args)
{
if (hasFocus)
{
var occludedRect = args.OccludedRect;
var element = textBox.TransformToVisual(null);
var point = element.TransformPoint(new Point(0, 0));
if (occludedRect.Top < point.Y + textBox.ActualHeight + listBox.ActualHeight)
{
listBox.Margin = new Thickness(0, -listBox.ActualHeight, 0, 0); // Draw above
}
else
{
listBox.Margin = new Thickness(0, textBox.ActualHeight, 0, 0); // draw below
}
}
}
private void textBox_GotFocus(object sender, RoutedEventArgs e)
{
listBox.Visibility = Windows.UI.Xaml.Visibility.Visible;
hasFocus = true;
}
private void textBox_LostFocus(object sender, RoutedEventArgs e)
{
listBox.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
hasFocus = false;
}
}
Next steps would be to expose properties to pass data to be bound to the ListBox. Hard core would be ListBoxItem templating and more, depending on how reusable you wanted it to be.