XaeroDegreaz
Topic Author
Posts: 29
Joined: 26 Nov 2013, 04:47

Unity - Framerate drops when pressing shift+tab, tab or clicking rightmost column inside of a ListView

07 Apr 2017, 09:43

A picture is worth a thousand words:

Image
Image

Here's the code-behind:
using System.Collections.ObjectModel;
using Noesis;

namespace KazBall.Ui.Hud
{
    public class ScoreScreen : UserControl
    {
        public ScoreScreen()
        {
            Initialized += ( sender, args ) => { DataContext = new ScoreScreenViewModel( this ); };
            GUI.LoadComponent( this, "Assets/Ui/Hud/ScoreScreen.xaml" );
        }
    }

    public class ScoreScreenViewModel
    {
        public class ScoreItem
        {
            public string PlayerName { get; set; }
            public int Score { get; set; }
            public string TeamColour { get; set; }
        }

        public ObservableCollection<ScoreItem> ScoreItems { get; set; } = new ObservableCollection<ScoreItem>();

        public ScoreScreenViewModel( UserControl rootControl )
        {
            ScoreItems.Add( new ScoreItem {PlayerName = "Player 1", Score = 1, TeamColour = "Red"} );
            ScoreItems.Add( new ScoreItem {PlayerName = "Player 1", Score = 1, TeamColour = "LightBlue"} );
            //# These fix the "Tab" key, but not the "Shift + Tab"
            //rootControl.KeyDown += ( sender, args ) => args.Handled = true;
            //rootControl.PreviewKeyDown += ( sender, args ) => args.Handled = true;
        }
    }
}
Here's the WPF:
<UserControl
    KeyboardNavigation.TabNavigation="None"
    xmlns="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" 
    mc:Ignorable="d"
    x:Class="KazBall.Ui.Hud.ScoreScreen"
    d:DesignWidth="640" d:DesignHeight="480">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <ListView 
            x:Name="ListView"
            Grid.ColumnSpan="2"
            ItemsSource="{Binding ScoreItems}">
            <ListView.View>
                <GridView AllowsColumnReorder="False">
                    <GridViewColumn 
                        Header="Player" 
                        Width="{Binding ActualWidth, ElementName=LeftColumn}">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock 
                                    Text="{Binding PlayerName}"
                                    Foreground="{Binding TeamColour}" />
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                    <GridViewColumn 
                        Header="Score" 
                        Width="{Binding ActualWidth, ElementName=RightColumn}"
                        DisplayMemberBinding="{Binding Score}"/>
                </GridView>
            </ListView.View>
        </ListView>
        <!-- Stupid hack for grid view columns to auto width -->
        <Grid Visibility="Hidden">
            <Grid Grid.Column="1"  x:Name="LeftColumn" />
            <Grid Grid.Column="2"  x:Name="RightColumn" />
        </Grid>
    </Grid>
</UserControl>
I'd also like to not that it only seems to happen when there are actually items in the list.

Another note:
I tried changing the width of the two columns so that the right-most column is not wide enough to reach the edge of the grid and that stopped it from freaking out. I think it's related to the problem: viewtopic.php?f=3&t=1045
 
User avatar
sfernandez
Site Admin
Posts: 1912
Joined: 22 Dec 2011, 19:20

Re: Unity - Framerate drops when pressing shift+tab, tab or clicking rightmost column inside of a ListView

07 Apr 2017, 17:07

Something very bad and unexpected is happening there :?

We will investigate this issue and fix it as soon as possible.

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