在视图中绘制用户控件。 [英] Draw usercontrol when is in view.

问题描述

我正在开发一个WPF MVVM项目，我有一个显示一些统计信息的用户控件。此用户控件嵌入在列表框中。通常我在列表框中加载大约400到500个用户控件对象。当我加载大约400到500个用户控件实例时，通常需要更多时间来加载。现在我想加载视图中的项目。



注意：我不能使用VirtualizingPanel.VirtualizationMode，因为根据客户要求，项目不应显示在下面另一个。他希望它像网格一样。为了达到这个目的，我在列表框的项目面板中使用了包装面板。



列表框代码：

I am working on a WPF MVVM project where i have a user control which displays some statistics. This user control is embedded in the listbox. usually i load around 400 to 500 objects of user control in the listbox. As i load around 400 to 500 instances of user control it usually takes more time to load. Now i want to load items which are present in the view.

Note: i can not use VirtualizingPanel.VirtualizationMode because as per client requirement the items should not display one below another. He wants it to be like grid. To achieve this i am using wrap panel inside items panel of listbox.

Listbox code:

<ListBox Name="lvDataBinding"  SelectionMode="Single" ItemsSource="{Binding AllTiles}" VirtualizingPanel.VirtualizationMode="Recycling">
                <ListBox.ItemsPanel >
                    <ItemsPanelTemplate>
                        <WrapPanel Width="{Binding (FrameworkElement.ActualWidth), 
                        RelativeSource={RelativeSource AncestorType=ScrollContentPresenter}}">
                        </WrapPanel>
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <custom:TileControl Margin="10" DataContext="{Binding}"/>
                    </DataTemplate>
                </ListBox.ItemTemplate>
                <ListBox.ItemContainerStyle>
                    <Style>
                        <Style.Resources>
                            <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}"
                             Color="Transparent"/>
                        </Style.Resources>
                    </Style>
                </ListBox.ItemContainerStyle>
                <ListBox.GroupStyle>
                    <GroupStyle>
                        <GroupStyle.ContainerStyle>
                            <Style TargetType="{x:Type GroupItem}">
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate>
                                            <Expander Header="{Binding}" IsExpanded="True">
                                                <Expander.HeaderTemplate>
                                                    <DataTemplate>
                                                        <StackPanel Orientation="Horizontal" Background="Transparent">
                                                            <TextBlock Text="{Binding Name}" TextBlock.FontSize="20" />
                                                        </StackPanel>
                                                    </DataTemplate>
                                                </Expander.HeaderTemplate>
                                                <ItemsPresenter />
                                            </Expander>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </GroupStyle.ContainerStyle>
                    </GroupStyle>
                </ListBox.GroupStyle>               
            </ListBox>

我如何绘制视图中的项目？

因为它违反了我的公司政策，我无法添加完整的源代码。



我是什么尝试过：



尝试虚拟化面板属性，但只有当面板是堆栈面板时才会起作用

How can i draw items which are present in view?
As it violates my company policy i can not add complete source code.

What I have tried:

Tried virtualizing panel property but it will work only if the panel is stack panel

推荐答案

C＃ - 将WrapPanel虚拟化为ListView的ItemsTemplate - Stack Overflow [ ^ ]

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