WPF随笔之 控件根据设定的显示行数列数填充控件并自适应窗体大小(多绑定MVVM方式实现)

 

(效果图,如见最下面)

需求:根据设置的行数列数,控制展示控件个数,并且填充的控件们大小刚刚好自适应填充满固定的区域,并且调整窗体大小的时候控件动态自适应窗体大小,即自适应大小并不显示滚动条(比如,设置了1行1列,则第一页显示一个控件,如设置了2行2列,则第一页显示第一行2个控件,第二行2个控件)。

解决方案,我总结有3

1.在cs代码里面动态生成Grid控件,根据设定的行列动态生成行列,将控件自适应宽高填充进去

2.固定Grid。使用WrapPanel排序,当Grid实际宽高发生改变时,动态计算每一个格子控件的宽高,通过绑定每一个控件的宽高实现

3.使用MVVM方式,利用Converter实现

其实第一第二种都特别winform写法,当年做MVC的时候,已经被MVC的模式洗脑,自己万不得已的时候才会使用这两种方式去实现,所以不推荐大家使用

当接手这个功能的时候已经有人使用方法2实现,在绑定的实体里面加了三个属性,FontSize、Width、Height,而且计算也不准确,忽略了margin,最小值设定等东西。(耦合性强,代码错乱,不好维护等缺点不一一列举),现在改成方式3去实现,特别简单,我们只需要使用Converter实现就好,因为ConverterParameter并不支持Binding写法,这里需用用到了多绑定方式去实现

(代码仅做参考,异常处理未写)

<ItemsControl Grid.Row="1"  x:Name="list" ItemsSource="{Binding DefectCodeInfoPage}"  >
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <WrapPanel  IsItemsHost="True"/>
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <!--高度应设最小值-->
                                    <Grid Margin="0 5 5 5" MinHeight="30">
                                        <Grid.Width>
                                            <MultiBinding Converter="{StaticResource WidthConverter}">
                                                <Binding ElementName="list" Path="ActualWidth" />
                                                <Binding Path="DataContext.Colunm" RelativeSource="{RelativeSource Mode=FindAncestor,AncestorType={x:Type local:ModPqcHeaderAdd}}"/>
                                                <Binding Path="Margin" RelativeSource="{RelativeSource Mode=Self}" />
                                            </MultiBinding>
                                        </Grid.Width>
                                        <Grid.Height>
                                            <MultiBinding Converter="{StaticResource HeightConverter}">
                                                <Binding ElementName="list" Path="ActualHeight" />
                                                <Binding Path="DataContext.Row" RelativeSource="{RelativeSource Mode=FindAncestor,AncestorType={x:Type local:ModPqcHeaderAdd}}"/>
                                                <Binding Path="Margin" RelativeSource="{RelativeSource Mode=Self}" />
                                            </MultiBinding>
                                        </Grid.Height>
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="7*" />
                                        <ColumnDefinition Width="3*" />
                                        </Grid.ColumnDefinitions>
                                        <Button
                                            Grid.Column="0"
                                            HorizontalAlignment="Stretch"
                                            VerticalAlignment="Stretch"
                                            Width="auto"
                                            Height="auto"
                                            Click="Button_MouseDown"
                                            Content="{Binding DEFECT_CODE_NAME, Mode=TwoWay}"
                                            FontFamily="Microsoft YaHei"
                                            FontSize="{Binding FontSize}"
                                            Foreground="Black"
                                            FontWeight="Bold"
                                            Tag="{Binding DEFECT_CODE, Mode=TwoWay}" />

                                        <TextBox
                                            Grid.Column="1"
                                            Width="auto"
                                            Height="auto"
                                            HorizontalAlignment="Stretch"
                                            VerticalAlignment="Stretch"
                                            HorizontalContentAlignment="Center"
                                            VerticalContentAlignment="Center"
                                            FontFamily="Microsoft YaHei"   
                                            FontSize="{Binding FontSize}"                                         
                                            Text="{Binding QTY, Mode=TwoWay}"
                                            TextAlignment="Center" />
                                    </Grid>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
部分代码xaml

多绑定的Converter实现如下

 1     [ValueConversion(typeof(double), typeof(double))]
 2     public class WidthConverter : IMultiValueConverter
 3     {
 4         public object Convert(object[] value, Type targetType, object parameter, CultureInfo culture)
 5         {
 6             double intWidth = 100;
 7             try
 8             {
 9 
10                 double actualWidth = (double)value[0];
11                 int cols = System.Convert.ToInt32(value[1]);
12                 Thickness margin = (Thickness)(value[2]);
13                 double lmargin = margin.Left;
14                 double rmargin = margin.Right;
15 
16                 if (cols == 0)
17                     return cols = 1;
18 
19                 intWidth = actualWidth / cols - cols * (lmargin + rmargin);
20             }
21             catch(Exception ex)
22             {
23             }
24             return intWidth;
25 
26         }
27         public object[] ConvertBack(object value, Type[] targetType, object parameter, CultureInfo culture)
28         {
29             return null;
30 
31         }
32 
33     }
34 
35     [ValueConversion(typeof(double), typeof(double))]
36     public class HeightConverter : IMultiValueConverter
37     {
38 
39         public object Convert(object[] value, Type targetType, object parameter, CultureInfo culture)
40         {
41             double intHeight = 30;
42             try
43             {
44 
45                 double actualHeight = (double)value[0];
46                 int rows = System.Convert.ToInt32(value[1]);
47                 Thickness margin = (Thickness)(value[2]);
48                 double tmargin = margin.Top;
49                 double bmargin = margin.Bottom;
50                 if (rows == 0)
51                     rows = 1;
52                 intHeight = actualHeight / rows - rows * (tmargin + bmargin);
53             }
54             catch
55             {
56             }
57             return intHeight;
58 
59         }
60         public object[] ConvertBack(object value, Type[] targetType, object parameter, CultureInfo culture)
61         {
62             return null;
63 
64         }
65 
66     }
Converters.cs

 

 当当当当~~~~ 是不是超简单,超简洁的。这样根本不用写一堆属性,还在各处去控制它们,总而言之一句话,“术业有专攻”,前台的东西莫要带走

 

 

设置一列一行时

设置两行一列时

设置一行两列时

设置N行N列时(忽略不截图了)

 

posted @ 2018-04-04 17:48  黄诗韵  阅读(513)  评论(0编辑  收藏  举报