WPF 自定义控件 实践

主要是在思考自定义控件 数据绑定问题 

创建自定义控件后 会生成样式 通过依赖属性来和台前界面属性 动态绑定

主要看怎么绑定值 希望给你们一个借鉴

  <Style TargetType="{x:Type local:DataTableItem}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:DataTableItem}">
                    <Grid x:Name="PART_Grid" Background="{Binding BgBackground,RelativeSource={RelativeSource TemplatedParent},UpdateSourceTrigger=PropertyChanged}" >
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="23*"/>
                            <ColumnDefinition Width="175*"/>
                            <ColumnDefinition Width="17*"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock  x:Name="PART_lalText" Text="{Binding Text,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent},UpdateSourceTrigger=PropertyChanged}" Width="168"  TextTrimming="CharacterEllipsis" Grid.Column="1" HorizontalAlignment="Left" Margin="0" VerticalAlignment="Center" Height="20" >
                            <TextBlock.ToolTip>
                                <ToolTip x:Name="PART_Tooltext"   Content="{Binding Text,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent},UpdateSourceTrigger=PropertyChanged}" >

                                </ToolTip>
                            </TextBlock.ToolTip>
                        </TextBlock>
                        <Rectangle x:Name="PART_rt" Fill="{Binding RtFile,RelativeSource={RelativeSource TemplatedParent},UpdateSourceTrigger=PropertyChanged}" Visibility="{Binding Vis,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent},UpdateSourceTrigger=PropertyChanged}"   HorizontalAlignment="Left" Margin="0" Width="2"/>
                        <Path x:Name="PART_Path" Stroke="#FF1AB394" Visibility="{Binding Vis,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent},UpdateSourceTrigger=PropertyChanged}" Data="M0.5,5.8330002 L5.5,10.5 M13.5,0.50000018 L5,10.5" HorizontalAlignment="Left" Height="11" Margin="7.336,10,0,0" Stretch="Fill"  VerticalAlignment="Top" Width="14"/>
                        <Path x:Name="PART_Pathadd" Visibility="{Binding Vis,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent},UpdateSourceTrigger=PropertyChanged}"  Data="M389.14278,485.376 C374.80678,485.376 360.47078,484.352 346.64678,481.792 228.88678,461.312 142.87078,360.96 142.87078,242.688 142.87078,109.056 253.46278,3.4790039E-06 389.14278,3.4790039E-06 524.82278,3.4790039E-06 635.41478,109.056 635.41478,242.688 635.92678,376.32 525.33478,485.376 389.14278,485.376 z M389.14278,61.440003 C287.25478,61.440003 204.31078,142.848 204.31078,242.688 204.31078,330.752 268.82278,406.016 357.39878,420.864 368.15078,422.4 378.90278,423.424 389.65478,423.424 491.54278,423.424 574.48678,342.016 574.48678,242.176 574.48678,142.848 491.54278,61.440003 389.14278,61.440003 z M30.742784,890.368 C14.358784,890.368 0.53478391,877.056 0.02278391,860.672 0.02278391,856.576 -2.5372161,754.176 46.614784,648.704 92.694784,549.888 193.55878,430.08 413.20678,422.912 430.10278,422.4 444.43878,435.712 444.95078,452.608 445.46278,469.504 432.15078,483.84 415.25478,484.352 264.21478,489.472 159.25478,553.472 102.42278,674.816 59.414784,766.976 61.462784,858.112 61.462784,859.136 61.974784,876.032 48.662784,890.368&#xA;31.766784,890.88 31.254784,890.368 31.254784,890.368 30.742784,890.368 z M695.31878,888.832 C616.47078,888.832 542.74278,849.92 498.19878,784.384 488.47078,770.56 492.56678,751.104 506.39078,741.888 520.21478,732.16 539.67078,736.256 548.88678,750.08 581.65478,798.72 636.43878,827.392 694.80678,827.392 792.08678,827.392 870.93478,748.032 870.93478,651.264 870.93478,554.496 791.57478,475.136 694.80678,475.136 630.80678,475.136 571.92678,509.952 540.69478,565.76 532.50278,580.608 513.55878,585.728&#xA;498.71078,577.536 483.86278,569.344 478.74278,550.4 486.93478,535.552 528.91878,460.288 608.79078,413.184 694.80678,413.184 825.87878,413.184 932.37478,519.68 932.37478,650.752 932.37478,781.824 826.39078,888.832 695.31878,888.832 z M708.63078,764.928 C691.73478,764.928 677.91078,751.104 677.91078,734.208 L677.91078,568.832 C677.91078,551.936 691.73478,538.112 708.63078,538.112 725.52678,538.112 739.35078,551.936 739.35078,568.832 L739.35078,734.208 C739.35078,751.104 725.52678,764.928 708.63078,764.928 z M791.06278,681.984 L625.68678,681.984 C608.79078,681.984 594.96678,668.16 594.96678,651.264 594.96678,634.368 608.79078,620.544 625.68678,620.544 L791.06278,620.544 C807.95878,620.544 821.78278,634.368 821.78278,651.264 821.78278,668.16 808.47078,681.984 791.06278,681.984 z" Margin="0,6.5,0.5,6.5" Stretch="Fill" Grid.Column="2" VerticalAlignment="Center" Height="16" Fill="#FF1AB394" Width="17"/>

                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

类

    public class DataTableItem : Control
    {
        static DataTableItem()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(DataTableItem), new FrameworkPropertyMetadata(typeof(DataTableItem)));
        }
        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set { SetValue(TextProperty, value); }
        }



        public Brush RtFile
        {
            get { return (Brush)GetValue(RtFileProperty); }
            set { SetValue(RtFileProperty, value); }
        }

        // Using a DependencyProperty as the backing store for RtFile.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty RtFileProperty =
            DependencyProperty.Register("RtFile", typeof(Brush), typeof(DataTableItem), new FrameworkPropertyMetadata(new SolidColorBrush((Color)ColorConverter.ConvertFromString("#00FFFFFF"))));



        public Visibility Vis
        {
            get { return (Visibility)GetValue(VisProperty); }
            set { SetValue(VisProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Vis.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty VisProperty =
            DependencyProperty.Register("Vis", typeof(Visibility), typeof(DataTableItem), new FrameworkPropertyMetadata(Visibility.Collapsed));




        public Brush BgBackground
        {
            get { return (Brush)GetValue(BgBackgroundProperty); }
            set { SetValue(BgBackgroundProperty, value); }
        }

        // Using a DependencyProperty as the backing store for BgBackground.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty BgBackgroundProperty =
            DependencyProperty.Register("BgBackground", typeof(Brush), typeof(DataTableItem), new PropertyMetadata(new SolidColorBrush((Color)ColorConverter.ConvertFromString("#00FFFFFF"))));



        //private Visibility vis = Visibility.Collapsed;
        //public Visibility Vis { get => vis; set => vis = value; }

        //private Brush rtFile;
        //public Brush RtFile { get => rtFile; set => rtFile = value; }

        //private Brush bgBackground;
        //public Brush BgBackground { get => bgBackground; set => bgBackground = value; }

        // Using a DependencyProperty as the backing store for Text.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TextProperty =
            DependencyProperty.Register("Text", typeof(string), typeof(DataTableItem), new FrameworkPropertyMetadata("",
                     FrameworkPropertyMetadataOptions.AffectsMeasure,
                     new PropertyChangedCallback(OnValueChanged))
            { BindsTwoWayByDefault = true });

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
    
        }
        private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ((DataTableItem)d).IsStringNull();
        }
        public void IsStringNull()
        {
            if (Text?.Trim() != "")
            {
                Vis = Visibility.Visible;
                RtFile = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#FF1AB394"));
                BgBackground = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#FFDBFFFC"));
                //OnApplyTemplate();
            }
        }
    }