前言
接着上週寫的截圖控件繼續更新 繪製方框與橢圓。
1.WPF實現截屏「仿微信」
2.WPF 實現截屏控件之移動（二）「仿微信」
3.WPF 截圖控件之伸縮(三) 「仿微信」
正文
有開發者在B站反饋第三篇有Issues已修復。
實現在截圖區域內繪製 方框與橢圓 有兩種方式
1）可以在截圖的區域內部添加一個Canvas寬高填充至區域內，在進行繪製方框或橢圓。
2）直接在外層的Canvas中添加，這樣需要判斷鼠標按下的位置和移動的位置必須在已截圖區域內，如超出範圍也不繪製到區域外。
本章使用了第二種方式
此篇更新截圖時隱藏當前窗口
一、首先接着ScreenCut繼續發電。
1.1
新增定義 畫方框、橢圓、顏色選擇框Popup、Popup內部Border、Border內部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>
/// 當前繪製矩形
/// </summary>
private Border borderRectangle;
/// <summary>
/// 繪製當前橢圓
/// </summary>
private Ellipse drawEllipse;
/// <summary>
/// 當前選擇顏色
/// </summary>
private Brush _currentBrush;
1.2
新增RadioButtonStyles爲了選擇方框、橢圓、顏色
<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增加代碼如下
<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="橢圓"
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 增加的後臺邏輯如下
2.1 RadioButton選中方框和橢圓的切換Popup並設置ScreenCutMouseType枚舉和鼠標：
_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繪製方框和橢圓代碼如下：
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跟隨問題這裏解決辦法是先關閉再打開代碼如下：
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();
}
}
完整代碼如下
