PDFOffice_Windows_exe/PDF Office/Views/Scan/ScanViwer.xaml.cs

using PDF_Office.CustomControl.ScanViewControl;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace PDF_Office.Views.Scan
{
    /// <summary>
    /// ScanViwer.xaml 的交互逻辑
    /// </summary>
    public partial class ScanViwer : UserControl
    {
        public ScanViwer()
        {
            InitializeComponent();
        }

        double scale = 1;
        private void Grid_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
            {
                if (e.Delta > 0)
                {
                    scale += 0.1;
                    ImageGrid.Width = 500* scale;
                    ImageGrid.Height = 500 * scale;
                }
                else
                {
                    if (scale > 0.2)
                    {
                        scale -= 0.2;
                    }
                    ImageGrid.Width = 500* scale;
                    ImageGrid.Height = 500 * scale;

                }
            }
            RedressControl.Visibility = Visibility.Collapsed;
        }

        private Point MouseDownPos;
        private async void CustomPanel_MouseDown(object sender, MouseButtonEventArgs e)
        {
            RedressControl.Visibility = Visibility.Visible;
            MouseDownPos = e.GetPosition(BitmapPanel);
            HitTestResult hitResult = VisualTreeHelper.HitTest(BitmapPanel, MouseDownPos);
            if (hitResult != null && hitResult.VisualHit is CustomDraw)
            {
                CustomDraw hitChild = (CustomDraw)hitResult.VisualHit;
                BitmapPanel.DisplayContent(hitChild);
                RedressControl.SetValue(Canvas.LeftProperty, hitChild.PaintRect.Left + (hitChild.PaintRect.Width / 2 - RedressControl.ActualWidth / 2));
                if (hitChild.PaintRect.Top - RedressControl.ActualHeight > 0)
                {
                    RedressControl.SetValue(Canvas.TopProperty, hitChild.PaintRect.Top - RedressControl.ActualHeight);
                }
                else
                {
                    RedressControl.SetValue(Canvas.TopProperty, hitChild.PaintRect.Bottom);
                }
                RedressControl.HitChild = hitChild;
                RedressControl.TextBoxContext = hitChild.PaintText;
                await Task.Delay(5);
                RedressControl.SelectAll();
                return;
            }
            RedressControl.Visibility = Visibility.Collapsed;
        }

        private void RedressControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (!(bool)e.NewValue)
            {
                BitmapPanel.DisplayContent(null);
            }
        }

        private void RedressControl_ApplyCommandHandler(object sender, EventArgs e)
        {
            RedressControl.HitChild.PaintText = RedressControl.TextBoxContext;
            RedressControl.HitChild.Draw(); 
            RedressControl.Visibility = Visibility.Collapsed;
        }
    }
}