【WP7】自定义控件

首先说说自定义控件

  WP7自带的控件使用起来太过于单一,有时候我们需要自己自定义一些空间的行为或显示,下面演示自定义按钮控件,为新控件添加BackColor和ForeColor两个属性

  1、新建一个类,定义两个属性 ForeColor 和 BackColor

        public class MyButton : Button
        {
            public MyButton() { }

            public Color ForeColor
            {
                get 
                {
                    return ((SolidColorBrush)this.Foreground).Color;
                }
                set 
                {
                    this.Foreground = new SolidColorBrush(value);
                }
            }

            public Color BackColor
            {
                get 
                {
                    return ((SolidColorBrush)this.Background).Color;
                }
                set
                {
                    this.Background = new SolidColorBrush(value);
                }
            }
        }

  接下来是使用,在xaml页面中使用该控件,先添加命名空间

      xmlns:local="clr-namespace:PhoneApp1"
        <local:MyButton BackColor="Red" ForeColor="White" Content="Button" Height="72"  x:Name="myButton1" Width="160" />

  接下来将该属性作为资源样式Style来设置

        <phone:PhoneApplicationPage.Resources>
            <Style x:Key="colorStyle1" TargetType="local:MyButton">
                <Setter Property="BackColor" Value="Azure" ></Setter>
                <Setter Property="ForeColor" Value="Chartreuse" ></Setter>
            </Style>
        </phone:PhoneApplicationPage.Resources>
        <local:MyButton Style="{StaticResource colorStyle1}" Content="Button" Height="72" x:Name="myButton1" Width="160" />

    但是会报错

    为什么呢,要想为自定义的属性使用Style,那么就必须将之设置为DependencyProperty

      DependencyProperty的定义格式为

      public static readonly DependencyProperty 变量名=
          DependencyProperty.Register("属性名",
          typeof(属性类型),
          typeof(所属类的类型),
          new PropertyMetadata(默认值, 值变化时触发的方法));

    现在我们修改之前的代码,将ForceColor和BackColor设置为DependencyProperty,修改后的MyButton类如下

        public class MyButton : Button
        {
            public MyButton() { }

            public Color ForeColor
            {
                get { return (Color)GetValue(ForeColorProperty); }
                set { SetValue(ForeColorProperty, value); }
            }
            public Color BackColor
            {
                get { return (Color)GetValue(BackgroundProperty); }
                set { SetValue(BackgroundProperty, value); }
            }

            public static readonly DependencyProperty BackColorProperty =
                DependencyProperty.Register("BackColor", typeof(Color), typeof(MyButton),
                new PropertyMetadata(Colors.Blue, OnColorChanged));
            public static readonly DependencyProperty ForeColorProperty =
                DependencyProperty.Register("ForeColor", typeof(Color), typeof(MyButton),
                new PropertyMetadata(Colors.Red, OnColorChanged));

            private static void OnColorChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
            {
                MyButton btn = obj as MyButton;
                if (e.Property == ForeColorProperty)
                {
                    btn.Foreground = new SolidColorBrush((Color)e.NewValue);
                }
                if (e.Property == BackColorProperty)
                {
                    btn.Background = new SolidColorBrush((Color)e.NewValue);
                }
            }
        }

    然后设置资源

        <phone:PhoneApplicationPage.Resources>
            <Style x:Key="colorStyle1" TargetType="local:MyButton">
                <Setter Property="BackColor" Value="BlueViolet" ></Setter>
                <Setter Property="ForeColor" Value="Red" ></Setter>
            </Style>
        </phone:PhoneApplicationPage.Resources>
        <local:MyButton Style="{StaticResource colorStyle1}" Content="Button" Height="72" x:Name="myButton1" Width="160" />

但是,在设计视图中,不能看到效果

原文地址:https://www.cnblogs.com/bomo/p/2767952.html