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所属分类：.NET技术
前言
接着上周写的截图控件继续更新 绘制方框与椭圆。
1.WPF实现截屏「仿微信」
2.WPF 实现截屏控件之移动（二）「仿微信」
3.WPF 截图控件之伸缩(三) 「仿微信」
正文
有开发者在B站反馈第三篇有Issues已修复。
实现在截图区域内绘制 方框与椭圆 有两种方式
1）可以在截图的区域内部添加一个Canvas宽高填充至区域内，在进行绘制方框或椭圆。
2）直接在外层的Canvas中添加，这样需要判断鼠标按下的位置和移动的位置必须在已截图区域内，如超出范围也不绘制到区域外。
本章使用了第二种方式
此篇更新截图时隐藏当前窗口
一、首先接着ScreenCut继续发电。
1.1
新增定义 画方框、椭圆、颜色选择框Popup、Popup内部Border、Border内部RadioButton的父容器
[TemplatePart(Name = RadioButtonRectangleTemplateName, Type = typeof(RadioButton))] [TemplatePart(Name = RadioButtonEllipseTemplateName, Type = typeof(RadioButton))] [TemplatePart(Name = PopupTemplateName, Type = typeof(Popup))] [TemplatePart(Name = PopupBorderTemplateName, Type = typeof(Border))] [TemplatePart(Name = WrapPanelColorTemplateName, Type = typeof(WrapPanel))] private const string RadioButtonRectangleTemplateName = "PART_RadioButtonRectangle"; private const string RadioButtonEllipseTemplateName = "PART_RadioButtonEllipse"; private const string PopupTemplateName = "PART_Popup"; private const string PopupBorderTemplateName = "PART_PopupBorder"; private const string WrapPanelColorTemplateName = "PART_WrapPanelColor"; private Popup _popup; private WrapPanel _wrapPanel; /// <summary> /// 当前绘制矩形 /// </summary> private Border borderRectangle; /// <summary> /// 绘制当前椭圆 /// </summary> private Ellipse drawEllipse; /// <summary> /// 当前选择颜色 /// </summary> private Brush _currentBrush; 1.2
新增RadioButtonStyles为了选择方框、椭圆、颜色
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Basic/ControlBasic.xaml"/> </ResourceDictionary.MergedDictionaries> <Style x:Key="PathRadioButton" TargetType="{x:Type RadioButton}" BasedOn="{StaticResource ControlBasicStyle}"> <Setter Property="FocusVisualStyle" Value="{x:Null}"/> <Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True" /> <Setter Property="HorizontalContentAlignment" Value="Center" /> <Setter Property="VerticalContentAlignment" Value="Center" /> <Setter Property="BorderThickness" Value="1" /> <Setter Property="Padding" Value="8" /> <Setter Property="Cursor" Value="Hand"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type RadioButton}"> <Border Background="Transparent"> <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" x:Name="PART_ContentPresenter" Opacity=".8"/> </Border> <ControlTemplate.Triggers> <Trigger Property="IsChecked" Value="True"> <Setter Property="Opacity" TargetName="PART_ContentPresenter" Value="1"/> </Trigger> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Opacity" TargetName="PART_ContentPresenter" Value="1"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="ColorRadioButton" TargetType="{x:Type RadioButton}" BasedOn="{StaticResource ControlBasicStyle}"> <Setter Property="FocusVisualStyle" Value="{x:Null}"/> <Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True" /> <Setter Property="HorizontalContentAlignment" Value="Center" /> <Setter Property="VerticalContentAlignment" Value="Center" /> <Setter Property="Padding" Value="8" /> <Setter Property="Width" Value="15"/> <Setter Property="Height" Value="15"/> <Setter Property="Cursor" Value="Hand"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type RadioButton}"> <Border Background="{TemplateBinding Background}" BorderThickness="0" x:Name="PART_Border" CornerRadius="7" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CheckStates"> <VisualState x:Name="Checked"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="PART_Ellipse"> <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Visible}" /> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Unchecked" /> <VisualState x:Name="Indeterminate" /> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Ellipse x:Name="PART_Ellipse" Width="7" Height="7" Fill="{DynamicResource WhiteSolidColorBrush}" Visibility="Collapsed"/> </Border> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Opacity" Value=".8"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary> 1.3
ScreenCut.xaml增加代码如下
<RadioButton x:Name="PART_RadioButtonRectangle" Style="{DynamicResource PathRadioButton}" ToolTip="方框" Margin="4,0"> <RadioButton.Content> <Path Fill="{DynamicResource RegularTextSolidColorBrush}" Width="18" Height="18" Stretch="Fill" Data="{StaticResource PathRectangle}"/> </RadioButton.Content> </RadioButton> <RadioButton x:Name="PART_RadioButtonEllipse" Style="{DynamicResource PathRadioButton}" ToolTip="椭圆" Margin="4,0"> <ToggleButton.Content> <Ellipse Width="19" Height="19" StrokeThickness="1.5" SnapsToDevicePixels="True" UseLayoutRounding="True" Stroke="{DynamicResource RegularTextSolidColorBrush}"/> </ToggleButton.Content> </RadioButton> <Popup x:Name="PART_Popup" AllowsTransparency="True" Placement="Bottom" VerticalOffset="13"> <Border Effect="{DynamicResource PopupShadowDepth}" Background="{DynamicResource WhiteSolidColorBrush}" Margin="10,30,10,10" CornerRadius="{Binding Path=(helpers:ControlsHelper.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="PART_PopupBorder"> <Grid> <Path Data="{StaticResource PathUpperTriangle}" Fill="{DynamicResource WhiteSolidColorBrush}" Stretch="Uniform" Width="10" VerticalAlignment="Top" Margin="0,-8,0,0" SnapsToDevicePixels="True" UseLayoutRounding="True"/> <WrapPanel Margin="10" VerticalAlignment="Center" x:Name="PART_WrapPanelColor"> <RadioButton Style="{DynamicResource ColorRadioButton}" Margin="4,0" Background="Red" IsChecked="True"> </RadioButton> <RadioButton Style="{DynamicResource ColorRadioButton}" Margin="4,0" Background="DodgerBlue"> </RadioButton> </WrapPanel> </Grid> </Border> </Popup> 二、ScreenCut.cs 增加的后台逻辑如下
2.1 RadioButton选中方框和椭圆的切换Popup并设置ScreenCutMouseType枚举和鼠标：
_radioButtonRectangle = GetTemplateChild(RadioButtonRectangleTemplateName) as RadioButton; if (_radioButtonRectangle != null) _radioButtonRectangle.Click += _radioButtonRectangle_Click; _radioButtonEllipse = GetTemplateChild(RadioButtonEllipseTemplateName) as RadioButton; if (_radioButtonEllipse != null) _radioButtonEllipse.Click += _radioButtonEllipse_Click; private void _radioButtonRectangle_Click(object sender, RoutedEventArgs e) { RadioButtonChecked(_radioButtonRectangle, ScreenCutMouseType.DrawRectangle); } private void _radioButtonEllipse_Click(object sender, RoutedEventArgs e) { RadioButtonChecked(_radioButtonEllipse, ScreenCutMouseType.DrawEllipse); } void RadioButtonChecked(RadioButton radioButton, ScreenCutMouseType screenCutMouseTypeRadio) { if (radioButton.IsChecked == true) { screenCutMouseType = screenCutMouseTypeRadio; _border.Cursor = Cursors.Arrow; if (_popup.PlacementTarget != null && _popup.IsOpen) _popup.IsOpen = false; _popup.PlacementTarget = radioButton; _popup.IsOpen = true; } else { if (screenCutMouseType == screenCutMouseTypeRadio) Restore(); } } void Restore() { _border.Cursor = Cursors.SizeAll; if (screenCutMouseType == ScreenCutMouseType.Default) return; screenCutMouseType = ScreenCutMouseType.Default; } 2.2 ScreenCut绘制方框和椭圆代码如下：
void DrawMultipleControl(Point current) { if (current == pointStart) return; if (current.X > rect.BottomRight.X || current.Y > rect.BottomRight.Y) return; var drawRect = new Rect(pointStart, current); switch (screenCutMouseType) { case ScreenCutMouseType.DrawRectangle: if (borderRectangle == null) { borderRectangle = new Border() { BorderBrush = _currentBrush == null ? Brushes.Red : _currentBrush, BorderThickness = new Thickness(3), CornerRadius = new CornerRadius(3), }; _canvas.Children.Add(borderRectangle); } break; case ScreenCutMouseType.DrawEllipse: if (drawEllipse == null) { drawEllipse = new Ellipse() { Stroke = _currentBrush == null ? Brushes.Red : _currentBrush, StrokeThickness = 3, }; _canvas.Children.Add(drawEllipse); } break; } var _borderLeft = drawRect.Left - Canvas.GetLeft(_border); if (_borderLeft < 0) _borderLeft = Math.Abs(_borderLeft); if (drawRect.Width + _borderLeft < _border.ActualWidth) { var wLeft = Canvas.GetLeft(_border) + _border.ActualWidth; var left = drawRect.Left < Canvas.GetLeft(_border) ? Canvas.GetLeft(_border) : drawRect.Left > wLeft ? wLeft : drawRect.Left; if (borderRectangle != null) { borderRectangle.Width = drawRect.Width; Canvas.SetLeft(borderRectangle, left); } if (drawEllipse != null) { drawEllipse.Width = drawRect.Width; Canvas.SetLeft(drawEllipse, left); } } var _borderTop = drawRect.Top - Canvas.GetTop(_border); if(_borderTop < 0) _borderTop = Math.Abs(_borderTop); if (drawRect.Height + _borderTop < _border.ActualHeight) { var hTop = Canvas.GetTop(_border) + _border.Height; var top = drawRect.Top < Canvas.GetTop(_border) ? Canvas.GetTop(_border) : drawRect.Top > hTop ? hTop : drawRect.Top; if (borderRectangle != null) { borderRectangle.Height = drawRect.Height; Canvas.SetTop(borderRectangle, top); } if (drawEllipse != null) { drawEllipse.Height = drawRect.Height; Canvas.SetTop(drawEllipse, top); } } } 2.3 Popup跟随问题这里解决办法是先关闭再打开代码如下：
if (_popup != null && _popup.IsOpen) { _popup.IsOpen = false; _popup.IsOpen = true; } 2.4 ScreenCut使用方式如下：
public partial class ScreenCutExample : UserControl { public bool IsChecked { get { return (bool)GetValue(IsCheckedProperty); } set { SetValue(IsCheckedProperty, value); } } public static readonly DependencyProperty IsCheckedProperty = DependencyProperty.Register("IsChecked", typeof(bool), typeof(ScreenCutExample), new PropertyMetadata(false)); public ScreenCutExample() { InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { var screenCut = new ScreenCut(); if (IsChecked) { App.CurrentMainWindow.WindowState = WindowState.Minimized; screenCut.Show(); screenCut.Activate(); } else screenCut.ShowDialog(); } } 完整代码如下
