实例介绍
【实例简介】
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace ImageView
{
/// <summary>
/// ImageView.xaml 的交互逻辑
/// </summary>
public partial class ImageViews : UserControl
{
int thumbWidth;
int thumbHeight;
double scale=1;
double imgWidth;
double imgHeight;
double hOffSetRate = 0;//滚动条横向位置横向百分比
double vOffSetRate = 0;//滚动条位置纵向百分比
Storyboard sb_ShowTools;
Storyboard sb_HideTools;
Storyboard sb_Tip;
TransformGroup tfGroup;
#region 依赖属性
public static readonly DependencyProperty SourceProperty =
DependencyProperty.Register("Source", typeof(ImageSource),
typeof(ImageViews),
new PropertyMetadata(new PropertyChangedCallback(OnSourcePropertyChanged)));
public ImageSource Source
{
get { return (ImageSource)GetValue(SourceProperty); }
set { SetValue(SourceProperty, value); }
}
static void OnSourcePropertyChanged(object sender, DependencyPropertyChangedEventArgs args)
{
if (sender != null && sender is ImageViews)
{
ImageViews view = (ImageViews)sender;
if (args != null && args.NewValue != null)
{
ImageSource imgSource = args.NewValue as ImageSource;
view.imgBig.Source = imgSource;
view.imgless.Source = imgSource;
view.GetImageWidthHeight();
}
}
}
#endregion
public ImageViews()
{
InitializeComponent();
sb_ShowTools = this.FindResource("Sb_ShowTools") as Storyboard;
sb_HideTools = this.FindResource("Sb_HideTools") as Storyboard;
sb_Tip = this.FindResource("sb_Tips") as Storyboard;
tfGroup = this.FindResource("TfGroup") as TransformGroup;
this.Loaded = MainWindow_Loaded;
this.MouseEnter = ImageViews_MouseEnter;
this.MouseLeave = ImageViews_MouseLeave;
svImg.ScrollChanged = svImg_ScrollChanged;
gridMouse.MouseWheel = svImg_MouseWheel;
gridMouse.MouseLeftButtonDown = control_MouseLeftButtonDown;
gridMouse.MouseLeftButtonUp = control_MouseLeftButtonUp;
gridMouse.MouseMove = control_MouseMove;
btnActualsize.Click = btnActualsize_Click;
btnEnlarge.Click = btnEnlarge_Click;
btnNarrow.Click = btnNarrow_Click;
btnRotate.Click = btnRotate_Click;
SetbtnActualsizeEnable();
}
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
GetImageWidthHeight();
}
public void GetImageWidthHeight()
{
this.UpdateLayout();
if (imgWidth == 0.0 || imgHeight == 0.0)
{
imgWidth = control.ActualWidth;
imgHeight = control.ActualHeight;
}
}
void btnRotate_Click(object sender, RoutedEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
scale = 1;
this.txtZoom.Text = ((int)(scale * 100)).ToString() "%";
if (sb_Tip != null)
sb_Tip.Begin();
SetbtnActualsizeEnable();
btnNarrow.IsEnabled = true;
btnEnlarge.IsEnabled = true;
hOffSetRate = 0;
vOffSetRate = 0;
imgBig.Width = imgWidth;
imgBig.Height = imgHeight;
if (tfGroup != null)
{
var rotate = tfGroup.Children[2] as RotateTransform;
rotate.Angle = 90;
}
}
void btnNarrow_Click(object sender, RoutedEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
btnEnlarge.IsEnabled = true;
if (scale < 0.15 )
return;
scale = scale * (1 / 1.2);
SetbtnActualsizeEnable();
if (scale < 0.15)
{
btnNarrow.IsEnabled = false;
}
this.txtZoom.Text = ((int)(scale * 100)).ToString() "%";
if (sb_Tip != null)
sb_Tip.Begin();
SetImageByScale();
}
void btnEnlarge_Click(object sender, RoutedEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
btnNarrow.IsEnabled = true;
if (scale > 16 )
return;
scale = scale * 1.2;
SetbtnActualsizeEnable();
if (scale > 16)
{
btnEnlarge.IsEnabled = false;
}
this.txtZoom.Text = ((int)(scale * 100)).ToString() "%";
if (sb_Tip != null)
sb_Tip.Begin();
SetImageByScale();
}
void btnActualsize_Click(object sender, RoutedEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
scale = 1;
imgBig.Width = imgWidth;
imgBig.Height = imgHeight;
SetbtnActualsizeEnable();
}
void ImageViews_MouseLeave(object sender, MouseEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
if (sb_ShowTools != null)
sb_ShowTools.Pause();
if (sb_HideTools != null)
sb_HideTools.Begin();
}
void ImageViews_MouseEnter(object sender, MouseEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
if (sb_HideTools != null)
sb_HideTools.Pause();
if (sb_ShowTools != null)
sb_ShowTools.Begin();
}
private bool mouseDown;
private Point mouseXY;
void control_MouseMove(object sender, MouseEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
var img = sender as Grid;
if (img == null)
{
return;
}
if (mouseDown)
{
Domousemove(img, e);
}
}
private void Domousemove(Grid img, MouseEventArgs e)
{
if (e.LeftButton != MouseButtonState.Pressed)
{
return;
}
var position = e.GetPosition(img);
double X = mouseXY.X - position.X;
double Y = mouseXY.Y - position.Y;
mouseXY = position;
if (X != 0)
svImg.ScrollToHorizontalOffset(svImg.HorizontalOffset X);
if (Y != 0)
svImg.ScrollToVerticalOffset(svImg.VerticalOffset Y);
GetOffSetRate();
}
void control_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
var img = sender as Grid;
if (img == null)
{
return;
}
img.ReleaseMouseCapture();
mouseDown = false;
}
void control_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var img = sender as Grid;
if (img == null)
{
return;
}
img.CaptureMouse();
mouseDown = true;
mouseXY = e.GetPosition(img);
}
void svImg_MouseWheel(object sender, MouseWheelEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
if (scale < 0.15 && e.Delta < 0)
return;
if (scale > 16 && e.Delta > 0)
return;
scale = scale * (e.Delta > 0 ? 1.2 : 1 / 1.2);
SetbtnActualsizeEnable();
btnNarrow.IsEnabled = scale > 0.15;
btnEnlarge.IsEnabled = scale < 16;
this.txtZoom.Text = ((int)(scale * 100)).ToString() "%";
if (sb_Tip != null)
sb_Tip.Begin();
SetImageByScale();
}
private void SetImageByScale()
{
GetOffSetRate();
imgBig.Width = scale * imgWidth;
imgBig.Height = scale * imgHeight;
SetOffSetByRate();
}
/// <summary>
/// 通过滚动条位置百分比在放大缩小时设置滚动条位置
/// </summary>
private void SetOffSetByRate()
{
this.UpdateLayout();
if (svImg.ScrollableWidth > 0)
{
double hOffSet = hOffSetRate * svImg.ScrollableWidth;
svImg.ScrollToHorizontalOffset(hOffSet);
}
if (svImg.ScrollableHeight > 0)
{
double vOffSet = vOffSetRate * svImg.ScrollableHeight;
svImg.ScrollToVerticalOffset(vOffSet);
}
}
/// <summary>
/// 获取滚动条滚动位置百分比
/// </summary>
private void GetOffSetRate()
{
if (svImg.ScrollableWidth > 0)
{
if (svImg.HorizontalOffset != 0)
hOffSetRate = svImg.HorizontalOffset / svImg.ScrollableWidth;
}
if (svImg.ScrollableHeight > 0)
{
if (svImg.VerticalOffset != 0)
vOffSetRate = svImg.VerticalOffset / svImg.ScrollableHeight;
}
}
void svImg_ScrollChanged(object sender, ScrollChangedEventArgs e)
{
if (imgWidth == 0 || imgHeight == 0)
return;
thumbWidth = (int)mask.ActualWidth;
thumbHeight = (int)mask.ActualHeight;
double timeH = svImg.ViewportHeight / (svImg.ViewportHeight svImg.ScrollableHeight);
double timeW = svImg.ViewportWidth / (svImg.ViewportWidth svImg.ScrollableWidth);
double w = thumbWidth * timeW;
double h = thumbHeight * timeH;
double offsetx = 0;
double offsety = 0;
if (svImg.ScrollableWidth == 0)
{
offsetx = 0;
}
else
{
offsetx = (w - thumbWidth) / svImg.ScrollableWidth * svImg.HorizontalOffset;
}
if (svImg.ScrollableHeight == 0)
{
offsety = 0;
}
else
{
offsety = (h - thumbHeight) / svImg.ScrollableHeight * svImg.VerticalOffset;
}
Rect rect = new Rect(-offsetx, -offsety, w, h);
mask.UpdateSelectionRegion(rect);
//throw new NotImplementedException();
}
#region 设置工具栏按钮可用
/// <summary>
/// 设置1:1按钮可用
/// </summary>
private void SetbtnActualsizeEnable()
{
btnActualsize.IsEnabled = (int)(scale * 100) != 100;
}
#endregion
}
}
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