kmpdfkit_demo/ComPDFKit.Demo/PageEditor/CropWindow.xaml.cs

using ComPDFKit.PDFDocument;
using ComPDFKit.PDFPage;
using ComPDFKitViewer.PdfViewer;
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.Shapes;

namespace ComPDFKitDemo.PageEditor
{
    /// <summary>
    /// CropWindow.xaml 的交互逻辑
    /// </summary>
    public partial class CropWindow : Window
    {
        public CPDFViewer CurrentViewer { get; set; }
        private Rect CropRect { get; set; }
        private CPDFDocument Document { get; set; }
        private int CropPageUI { get; set; }
        public CropWindow()
        {
            InitializeComponent();
        }

        public void SetDoc(CPDFDocument doc)
        {
            Document = doc;
            
            CropUI.CurrentDoc = Document;
            PageCountText.Text = "of / "+ Document.PageCount;
            CropPageUI = CurrentViewer.CurrentIndex;
            CropUI.CropPageUI = CropPageUI;
            StartPageText.Text = (CropPageUI+1).ToString();
            EndPageText.Text = (CropPageUI + 1).ToString();
            CropUI.InvalidateVisual();
        }

        private int IgnorePrecision(double value)
        {
            int check=(int)value;
            if (check <= 2)
            {
                return 0;
            }
            return check;
        }
        private void CropUI_CropChanged(object sender, KeyValuePair<Rect, Rect> e)
        {
            CropRect = e.Key;
            LeftText.Text = Math.Max(0, IgnorePrecision(e.Key.Left- e.Value.Left)).ToString();
            TopText.Text = Math.Max(0, IgnorePrecision(e.Key.Top - e.Value.Top)).ToString();
            RightText.Text = Math.Max(0, IgnorePrecision(e.Value.Right - e.Key.Right)).ToString();
            BottomText.Text = Math.Max(0, IgnorePrecision(e.Value.Bottom - e.Key.Bottom)).ToString();
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            Close();
        }

        private void SaveButton_Click(object sender, RoutedEventArgs e)
        {
            if(CropRect!=Rect.Empty&& Document!=null&& Document.PageCount>0)
            {
                int startPage = CropPageUI;
                int endPage = CropPageUI;
                if (RangeRadioBtn.IsChecked==true)
                {
                    if(int.TryParse(StartPageText.Text,out startPage))
                    {
                        startPage -= 1;
                    }
                    if (int.TryParse(EndPageText.Text, out endPage))
                    {
                        endPage -= 1;
                    }
                }
                else
                {
                    startPage = 0;
                    endPage = Document.PageCount - 1;
                    
                }
                List<int> cropPageList=new List<int>();
                for (int i = startPage; i <= endPage && i < Document.PageCount; i++)
                {
                    cropPageList.Add(i);
                }
                if(cropPageList.Count>0)
                {
                    CurrentViewer?.CropPage((CPDFDisplayBox)CropTypeBox.SelectedIndex, CropRect, cropPageList);
                }
            }
            Close();
        }

        private void RadioButton_Checked(object sender, RoutedEventArgs e)
        {
            RadioButton checkRadioBtn=sender as RadioButton;
            if(checkRadioBtn!=null && checkRadioBtn.Tag!=null)
            {
                if(checkRadioBtn.Tag.ToString()== "AllRadioBtn")
                {
                    StartPageText.IsEnabled = false;
                    EndPageText.IsEnabled = false;
                    return;
                }
                if (checkRadioBtn.Tag.ToString() == "RangeRadioBtn")
                {
                    StartPageText.IsEnabled = true;
                    EndPageText.IsEnabled = true;
                    return;
                }
            }
        }

        private void RefreshButton_Click(object sender, RoutedEventArgs e)
        {
            int left, top, right, bottom;
            int.TryParse(LeftText.Text, out left);
            int.TryParse(TopText.Text, out top);
            int.TryParse(RightText.Text, out right);
            int.TryParse(BottomText.Text, out bottom);

            if (Document != null && Document.PageCount > CropPageUI && CropPageUI >= 0)
            {
                CPDFPage cropPage = Document.PageAtIndex(CropPageUI);
                Rect mediaRect = cropPage.GetBoundsForBox(CPDFDisplayBox.MediaBox);

                left = (int)(left + mediaRect.Left);
                top = (int)(top + mediaRect.Top);
                right = (int)(mediaRect.Right - right);
                bottom = (int)(mediaRect.Bottom - bottom);

                if (right > left && bottom > top)
                {
                    Rect cropData = new Rect(left, top, right - left, bottom - top);
                    if (mediaRect.Contains(cropData))
                    {
                        CropRect = cropData;
                        CropUI.UpdateCropRect(cropData);
                    }
                }
            }
        }
    }
}