基于WPF实现用户头像选择器的示例代码
作者：驚鏵
这篇文章主要为大家详细介绍了如何基于WPF实现用户头像选择器，文中的示例代码简洁易懂，对我们学习WPF有一定帮助，感兴趣的可以了解一下
实现思路
制作一个用户头像选择器仿 WeGame
制作一个用户头像选择Canvas为父控件所实现，展示图片使用Image，Path当作上方的蒙版;
Canvas：主要用途方便移动Image，设置ClipToBounds="True"裁剪为一个正方形200x200做为主要展示区域;
Image：展示需要裁剪的图片；
Path：CombinedGeometry[1]绘制蒙版大小200x200效果如下；
当选择一个本地图片的时候判断宽与高谁更大，谁小就将它更改为200 ，另一边做等比缩放后给到DrawingVisual绘制一个新的BitmapFrame[2]给Image控件做展示；
当移动图片的时候右侧展示当前区域使用CroppedBitmap[3]进行裁剪并显示；
源码Github[4] Gitee[5]
核心代码
1）CropAvatar.xaml 代码如下；
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:WPFDevelopers.Controls">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Basic/ControlBasic.xaml"/>
</ResourceDictionary.MergedDictionaries>
<Style TargetType="controls:CropAvatar" BasedOn="{StaticResource ControlBasicStyle}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:CropAvatar}">
<Canvas x:Name="PART_Canvas" ClipToBounds="True">
<Image x:Name="PART_Image" Cursor="SizeAll" ></Image>
<Path x:Name="PART_Layout"
Fill="{DynamicResource BlackSolidColorBrush}"
Width="200" Height="200"
Opacity=".5">
<Path.Data>
<CombinedGeometry GeometryCombineMode="Xor">
<CombinedGeometry.Geometry1>
<RectangleGeometry Rect="0,0,200,200"/>
</CombinedGeometry.Geometry1>
<CombinedGeometry.Geometry2>
<EllipseGeometry Center="100,100" RadiusX="100" RadiusY="100"/>
</CombinedGeometry.Geometry2>
</CombinedGeometry>
</Path.Data>
</Path>
<Grid x:Name="PART_Grid" Width="200" Height="200">
<Button x:Name="PART_ReplaceButton" Style="{StaticResource PathButton}"
HorizontalAlignment="Right"
VerticalAlignment="Top"
Width="40" Height="40" ToolTip="更换图片"
Visibility="Collapsed">
<Button.Content>
<Path Data="{StaticResource PathReplace}"
Fill="{StaticResource PrimaryNormalSolidColorBrush}"
Height="15"
Width="15"
Stretch="Fill" />
</Button.Content>
</Button>
<Button x:Name="PART_AddButton" Style="{StaticResource PathButton}"
Width="40" Height="40" ToolTip="选择图片">
<Button.Content>
<Path Data="{StaticResource PathAdd}"
Fill="{StaticResource PrimaryNormalSolidColorBrush}"
Height="20"
Width="20"
Stretch="Fill"
RenderTransformOrigin="0.5,0.5" IsHitTestVisible="False">
<Path.RenderTransform>
<RotateTransform Angle="45"/>
</Path.RenderTransform>
</Path>
</Button.Content>
</Button>
</Grid>
</Canvas>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
2）CropAvatar.cs 代码如下;
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using WPFDevelopers.Helpers;
namespace WPFDevelopers.Controls
{
[TemplatePart(Name = CanvasTemplateName, Type = typeof(Canvas))]
[TemplatePart(Name = ImageTemplateName, Type = typeof(Image))]
[TemplatePart(Name = PathTemplateName, Type = typeof(Path))]
[TemplatePart(Name = GridTemplateName, Type = typeof(Grid))]
[TemplatePart(Name = ReplaceButtonTemplateName, Type = typeof(Button))]
[TemplatePart(Name = AddButtonTemplateName, Type = typeof(Button))]
public partial class CropAvatar : Control
{
private const string CanvasTemplateName = "PART_Canvas";
private const string ImageTemplateName = "PART_Image";
private const string PathTemplateName = "PART_Layout";
private const string GridTemplateName = "PART_Grid";
private const string ReplaceButtonTemplateName = "PART_ReplaceButton";
private const string AddButtonTemplateName = "PART_AddButton";
private Point point;
private const int _size = 200;
private bool isDown;
private bool isLeft;
private CroppedBitmap crop;
private Canvas canvas;
private Image image;
private Path path;
private Grid grid;
private Button replaceButton, addButton;
private int initialX, initialY, voffsetX, voffsetY;
private double vNewStartX, vNewStartY, _StartX, _StartY, centerX, centerY;
private BitmapFrame bitmapFrame;
public ImageSource OutImageSource
{
get { return (ImageSource)GetValue(OutImageSourceProperty); }
set { SetValue(OutImageSourceProperty, value); }
}
public static readonly DependencyProperty OutImageSourceProperty =
DependencyProperty.Register("OutImageSource", typeof(ImageSource), typeof(CropAvatar), new PropertyMetadata(null));
static CropAvatar()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(CropAvatar), new FrameworkPropertyMetadata(typeof(CropAvatar)));
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
canvas = GetTemplateChild(CanvasTemplateName) as Canvas;
canvas.Loaded += Canvas_Loaded;
grid = GetTemplateChild(GridTemplateName) as Grid;
image = GetTemplateChild(ImageTemplateName) as Image;
image.MouseDown += Image_MouseDown;
image.MouseMove += Image_MouseMove;
image.MouseUp += Image_MouseUp;
image.MouseLeave += Image_MouseLeave;
path = GetTemplateChild(PathTemplateName) as Path;
replaceButton = GetTemplateChild(ReplaceButtonTemplateName) as Button;
replaceButton.Click += ReplaceButton_Click;
addButton = GetTemplateChild(AddButtonTemplateName) as Button;
addButton.Click += AddButton_Click;
}
private void Canvas_Loaded(object sender, RoutedEventArgs e)
{
if (sender is Canvas canvas)
{
var width = canvas.ActualWidth;
var height = canvas.ActualHeight;
centerX = (width - path.Width) / 2.0d;
centerY = (height - path.Height) / 2.0d;
canvas.Clip = new RectangleGeometry(new Rect(centerX, centerY, 200, 200));
Canvas.SetLeft(path, centerX);
Canvas.SetTop(path, centerY);
Canvas.SetLeft(grid, centerX);
Canvas.SetTop(grid, centerY);
}
}
private void Image_MouseLeave(object sender, MouseEventArgs e)
{
isDown = false;
if (isLeft)
_StartX = Canvas.GetLeft(image);
else
_StartY = Canvas.GetTop(image);
}
private void Image_MouseUp(object sender, MouseButtonEventArgs e)
{
if (isDown)
{
var vPoint = e.GetPosition(this);
if (isLeft)
{
_StartX = Canvas.GetLeft(image);
initialX = voffsetX;
}
else
{
_StartY = Canvas.GetTop(image);
initialY = voffsetY;
}
}
}
private void Image_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed && isDown)
{
var vPoint = e.GetPosition(this);
if (isLeft)
{
var voffset = vPoint.X - point.X;
vNewStartX = _StartX + voffset;
var xPath = Canvas.GetLeft(path);
if (vNewStartX <= xPath && vNewStartX >= -(bitmapFrame.Width - 200 - xPath))
{
Canvas.SetLeft(image, vNewStartX);
voffsetX = initialX - (int)voffset;
voffsetX = voffsetX < 0 ? 0 : voffsetX;
crop = new CroppedBitmap(bitmapFrame, new Int32Rect(voffsetX, 0, _size, _size));
}
}
else
{
var voffset = vPoint.Y - point.Y;
vNewStartY = _StartY + voffset;
var yPath = Canvas.GetTop(path);
if (vNewStartY <= yPath && vNewStartY >= -(bitmapFrame.Height - 200 - yPath))
{
Canvas.SetTop(image, vNewStartY);
voffsetY = initialY - (int)voffset;
voffsetY = voffsetY < 0 ? 0 : voffsetY;
crop = new CroppedBitmap(bitmapFrame, new Int32Rect(0, voffsetY, _size, _size));
}
}
OutImageSource = crop;
}
}
private void Image_MouseDown(object sender, MouseButtonEventArgs e)
{
isDown = true;
point = e.GetPosition(this);
}
private void ReplaceButton_Click(object sender, RoutedEventArgs e)
{
InitialImage();
}
private void AddButton_Click(object sender, RoutedEventArgs e)
{
InitialImage();
}
void InitialImage()
{
vNewStartX = 0;
vNewStartY = 0;
var uri = ControlsHelper.ImageUri();
if (uri == null) return;
var bitmap = new BitmapImage(uri);
if (bitmap.Height > bitmap.Width)
{
double scale = (double)bitmap.Width / (double)path.Width;
image.Width = _size;
image.Height = (double)bitmap.Height / scale;
isLeft = false;
}
else if (bitmap.Width > bitmap.Height)
{
double scale = (double)bitmap.Height / (double)path.Height;
image.Width = (double)bitmap.Width / scale;
image.Height = _size;
isLeft = true;
}
bitmapFrame = ControlsHelper.CreateResizedImage(bitmap, (int)image.Width, (int)image.Height, 0);
image.Source = bitmapFrame;
if (image.Source != null)
{
replaceButton.Visibility = Visibility.Visible;
addButton.Visibility = Visibility.Collapsed;
}
Canvas.SetLeft(grid, centerX);
Canvas.SetTop(grid, centerY);
_StartX = (canvas.ActualWidth - image.Width) / 2.0d;
_StartY = (canvas.ActualHeight - image.Height) / 2.0d;
Canvas.SetLeft(image, _StartX);
Canvas.SetTop(image, _StartY);
if (isLeft)
{
initialX = (int)(image.Width - 200) / 2;
initialY = 0;
crop = new CroppedBitmap(bitmapFrame, new Int32Rect(initialX, 0, _size, _size));
}
else
{
initialY = (int)(image.Height - 200) / 2;
initialX = 0;
crop = new CroppedBitmap(bitmapFrame, new Int32Rect(0, initialY, _size, _size));
}
OutImageSource = crop;
}
}
}3）CropAvatarWindow.xaml使用如下；
<ws:Window x:Class="WPFDevelopers.Samples.ExampleViews.CropAvatarWindow"
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:wpfdev="https://github.com/WPFDevelopersOrg/WPFDevelopers"
xmlns:ws="https://github.com/WPFDevelopersOrg.WPFDevelopers.Minimal"
mc:Ignorable="d" WindowStyle="ToolWindow" ResizeMode="NoResize"
WindowStartupLocation="CenterScreen"
Title="WPF 开发者-头像选择器" Height="450" Width="800">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<wpfdev:CropAvatar x:Name="MyCropAvatar"/>
<Image Grid.Column="1" Name="CropAvatarImage" Source="{Binding ElementName=MyCropAvatar,Path=OutImageSource}"
Stretch="Fill" Width="200" Height="200">
<Image.Clip>
<EllipseGeometry Center="100,100" RadiusX="100" RadiusY="100"/>
</Image.Clip>
</Image>
<UniformGrid Grid.Row="1" Grid.ColumnSpan="2"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Button Content="保存" Click="btnSave_Click" Style="{StaticResource PrimaryButton}" Margin="4,0"/>
<Button Content="关闭" Click="btnClose_Click" Margin="4,0"/>
</UniformGrid>
</Grid>
</ws:Window>4） CropAvatarWindow.xaml.cs 代码如下；
using System.Windows;
namespace WPFDevelopers.Samples.ExampleViews
{
/// <summary>
/// CropAvatarWindow.xaml 的交互逻辑
/// </summary>
public partial class CropAvatarWindow
{
public CropAvatarWindow()
{
InitializeComponent();
}
private void btnSave_Click(object sender, RoutedEventArgs e)
{
DialogResult = true;
}
private void btnClose_Click(object sender, RoutedEventArgs e)
{
DialogResult = false;
}
}
}5） CropAvatarExample.xaml 使用如下；
<UserControl x:Class="WPFDevelopers.Samples.ExampleViews.CropAvatarExample" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:wpfdev="https://github.com/WPFDevelopersOrg/WPFDevelopers" xmlns:local="clr-namespace:WPFDevelopers.Samples.ExampleViews" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Button Content="图像选择器" VerticalAlignment="Center" HorizontalAlignment="Center" Click="Button_Click"/> <Image Grid.Column="1" Name="MyImage" Stretch="Fill" Width="200" Height="200"> <Image.Clip> <EllipseGeometry Center="100,100" RadiusX="100" RadiusY="100"/> </Image.Clip> </Image> </Grid> </UserControl>
6） CropAvatarExample.xaml.cs 代码如下；
using System.Windows.Controls;
namespace WPFDevelopers.Samples.ExampleViews
{
/// <summary>
/// CropAvatarExample.xaml 的交互逻辑
/// </summary>
public partial class CropAvatarExample : UserControl
{
public CropAvatarExample()
{
InitializeComponent();
}
private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
{
var cropAvatarWindow = new CropAvatarWindow();
if (cropAvatarWindow.ShowDialog() == true)
{
MyImage.Source = cropAvatarWindow.CropAvatarImage.Source;
}
}
}
}参考资料
[2]BitmapFrame
[4]Github
[5]Gitee
到此这篇关于基于WPF实现用户头像选择器的示例代码的文章就介绍到这了,更多相关WPF头像选择器内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！