WPF开发经验-实现一种机械泵控件

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所属分类：.NET技术
摘要

考虑实现一种机械泵控件。机械泵是工业中通常用来制造真空的一类设备，我们在绘制界面UI时希望可以生动形象地来表述一个机械泵，下面讲述了一种简单的实现。
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一 引入

考虑实现一种机械泵控件。

机械泵是工业中通常用来制造真空的一类设备，我们在绘制界面UI时希望可以生动形象地来表述一个机械泵，下面讲述了一种简单的实现。

WPF开发经验-实现一种机械泵控件

二 MechanicalPumpControl

声明一个MechanicalPumpControl的自定义控件，它继承自Control类。

对于一个MechanicalPump来说，它具有状态，这里定义一个State依赖属性来简单描述泵的状态，State等于0表示泵停止状态，State等于1表示泵运行状态。

State可以绑定到实际的泵状态数据源，当泵状态数据变化时，MechanicalPumpControl需要相应动态显示泵状态动画。

定义StartAnimation和StopAnimation两个依赖属性，来启动和停止泵状态动画。

关于控件的状态切换也可以考虑用VisualStateManager来实现，可以更方便地管理控件的状态以及用于状态过渡的逻辑，推荐用这种方式。

public class MechanicalPumpControl : Control {     static MechanicalPumpControl()     {         DefaultStyleKeyProperty.OverrideMetadata(typeof(MechanicalPumpControl), new FrameworkPropertyMetadata(typeof(MechanicalPumpControl)));     }          public static readonly DependencyProperty StateProperty = DependencyProperty.Register(     "State",     typeof(int),     typeof(MechanicalPumpControl), new PropertyMetadata(PropertyChangedCallback));      public int State     {         get => (int)GetValue(StateProperty);         set => SetValue(StateProperty, value);     }      private static void PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)     {         var pumpControl = d as MechanicalPumpControl;          if ((int)e.OldValue == 0 && (int)e.NewValue == 1)         {             pumpControl.StopAnimation = false;             pumpControl.StartAnimation = true;         }         else if ((int)e.OldValue == 1 && (int)e.NewValue == 0)         {             pumpControl.StopAnimation = true;             pumpControl.StartAnimation = false;         }     }      public static readonly DependencyProperty StartAnimationProperty = DependencyProperty.Register(         "StartAnimation",         typeof(bool),         typeof(MechanicalPumpControl));      public bool StartAnimation     {         get => (bool)GetValue(StartAnimationProperty);         set => SetValue(StartAnimationProperty, value);     }      public static readonly DependencyProperty StopAnimationProperty = DependencyProperty.Register(         "StopAnimation",         typeof(bool),         typeof(MechanicalPumpControl));      public bool StopAnimation     {         get => (bool)GetValue(StopAnimationProperty);         set => SetValue(StopAnimationProperty, value);     } }

 

三 Style

接下来编写MechanicalPumpControl的样式。

考虑绘制出不动的泵体部分，和动作的扇叶部分。当泵停止状态时，扇叶静止，当泵运转状态时，扇叶转动。

样式代码如下：

 <Style TargetType="{x:Type Rectangle}" x:Key="FanRec">      <Setter Property="Canvas.Left" Value="7"/>      <Setter Property="Width" Value="48"/>      <Setter Property="Height" Value="6"/>      <Setter Property="RadiusX" Value="0.5"/>      <Setter Property="RadiusY" Value="0.5"/>      <Setter Property="Fill" Value="SlateGray"/>      <Setter Property="RenderTransform">          <Setter.Value>              <SkewTransform AngleX="-20" AngleY="-7"/>          </Setter.Value>      </Setter>  </Style>   <Style TargetType="{x:Type local:MechanicalPumpControl}">      <Setter Property="Template">          <Setter.Value>              <ControlTemplate TargetType="{x:Type local:MechanicalPumpControl}">                  <Viewbox Stretch="Fill">                      <Canvas Width="180" Height="100">                          <Rectangle Width="60" Height="60" Canvas.Top="10" Stroke="Gray"  StrokeThickness="3" RadiusX="3" RadiusY="3" />                          <Canvas  Width="60" Height="54" Canvas.Top="14" ClipToBounds="True">                              <Canvas x:Name="canvas1" Width="60" Height="54">                                  <Rectangle x:Name="rec1" Style="{StaticResource FanRec}" Canvas.Top="6"/>                                  <Rectangle x:Name="rec2" Style="{StaticResource FanRec}" Canvas.Top="16"/>                                  <Rectangle x:Name="rec3" Style="{StaticResource FanRec}" Canvas.Top="26"/>                                  <Rectangle x:Name="rec4" Style="{StaticResource FanRec}" Canvas.Top="36"/>                                  <Rectangle x:Name="rec5" Style="{StaticResource FanRec}" Canvas.Top="46"/>                              </Canvas>                              <Canvas x:Name="canvas2" Width="60" Height="54">                                  <Rectangle x:Name="rec6" Style="{StaticResource FanRec}" Canvas.Top="56"/>                                  <Rectangle x:Name="rec7" Style="{StaticResource FanRec}" Canvas.Top="66"/>                                  <Rectangle x:Name="rec8" Style="{StaticResource FanRec}" Canvas.Top="76"/>                                  <Rectangle x:Name="rec9" Style="{StaticResource FanRec}" Canvas.Top="86"/>                                  <Rectangle x:Name="rec10" Style="{StaticResource FanRec}" Canvas.Top="96"/>                                  <Rectangle x:Name="rec11" Style="{StaticResource FanRec}" Canvas.Top="106"/>                              </Canvas>                          </Canvas>                          <Rectangle  Width="5" Height="40" Canvas.Left="60" Canvas.Top="20"  Stroke="Gray"  StrokeThickness="4"/>                          <Rectangle  Width="110" Height="82" Canvas.Left="65"  RadiusX="3" RadiusY="3" Stroke="Gray"  StrokeThickness="4"/>                          <Rectangle  Width="10" Height="8" Canvas.Left="75" Canvas.Top="82" Fill="Gray" />                          <Rectangle  Width="10" Height="8" Canvas.Left="155" Canvas.Top="82" Fill="Gray" />                          <Rectangle  Width="140" Height="10" Canvas.Left="40" Canvas.Top="90" Fill="Black" RadiusX="2" RadiusY="2"/>                      </Canvas>                  </Viewbox>                  <ControlTemplate.Triggers>                      <Trigger Property="StartAnimation" Value="true">                          <Trigger.EnterActions>                              <BeginStoryboard Name="moveStory">                                  <Storyboard RepeatBehavior="Forever" SpeedRatio="4">                                      <DoubleAnimationUsingKeyFrames                                                   Storyboard.TargetName="canvas1"                                                   Storyboard.TargetProperty="(Canvas.Top)"                                                   Duration="0:0:6" >                                          <LinearDoubleKeyFrame Value="0" KeyTime="0:0:0"/>                                          <LinearDoubleKeyFrame Value="-10" KeyTime="0:0:1"/>                                          <LinearDoubleKeyFrame Value="-20" KeyTime="0:0:2"/>                                          <LinearDoubleKeyFrame Value="-30" KeyTime="0:0:3"/>                                          <LinearDoubleKeyFrame Value="-40" KeyTime="0:0:4"/>                                          <LinearDoubleKeyFrame Value="-50" KeyTime="0:0:5"/>                                          <LinearDoubleKeyFrame Value="-60" KeyTime="0:0:6"/>                                      </DoubleAnimationUsingKeyFrames>                                      <DoubleAnimationUsingKeyFrames                                                   Storyboard.TargetName="canvas2"                                                   Storyboard.TargetProperty="(Canvas.Top)"                                                   Duration="0:0:6" >                                          <LinearDoubleKeyFrame Value="0" KeyTime="0:0:0"/>                                          <LinearDoubleKeyFrame Value="-10" KeyTime="0:0:1"/>                                          <LinearDoubleKeyFrame Value="-20" KeyTime="0:0:2"/>                                          <LinearDoubleKeyFrame Value="-30" KeyTime="0:0:3"/>                                          <LinearDoubleKeyFrame Value="-40" KeyTime="0:0:4"/>                                          <LinearDoubleKeyFrame Value="-50" KeyTime="0:0:5"/>                                          <LinearDoubleKeyFrame Value="-60" KeyTime="0:0:6"/>                                      </DoubleAnimationUsingKeyFrames>                                  </Storyboard>                              </BeginStoryboard>                          </Trigger.EnterActions>                      </Trigger>                      <Trigger Property="StopAnimation" Value="true">                          <Trigger.EnterActions>                              <StopStoryboard BeginStoryboardName="moveStory">                              </StopStoryboard>                          </Trigger.EnterActions>                      </Trigger>                      <Trigger Property="State" Value="1">                          <Setter TargetName="rec1" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec2" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec3" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec4" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec5" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec6" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec7" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec8" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec9" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec10" Property="Fill" Value="SeaGreen"/>                          <Setter TargetName="rec11" Property="Fill" Value="SeaGreen"/>                      </Trigger>                  </ControlTemplate.Triggers>              </ControlTemplate>          </Setter.Value>      </Setter>  </Style>

 

四 效果演示

Xaml代码如下：

<Window x:Class="WpfApp1.MainWindow"         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"         xmlns:local="clr-namespace:WpfApp1"         mc:Ignorable="d"         Title="MainWindow" Height="768" Width="1366">     <Canvas>         <local:MechanicalPumpControl x:Name="pump" Canvas.Left="115" Canvas.Top="85"/>         <Button Content="START" Width="60" Height="30"  Canvas.Left="363" Canvas.Top="94" Click="STARTButton_Click"/>         <Button Content="STOP"  Width="60" Height="30"  Canvas.Left="363" Canvas.Top="143" Click="STOPButton_Click"/>     </Canvas> </Window>

后台代码如下：

public partial class MainWindow : Window {     public MainWindow()     {         InitializeComponent();     }     private void STARTButton_Click(object sender, RoutedEventArgs e)     {         pump.State = 1;     }     private void STOPButton_Click(object sender, RoutedEventArgs e)     {         pump.State = 0;     } }

 

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