ImageExample.cs

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using System.Collections.Generic;
using System.IO;
using B83.Win32;
using UnityEngine;
 
public class ImageExample : MonoBehaviour
{
    private class DropInfo
    {
        public string file;
 
        public Vector2 pos;
    }
 
    private Texture2D[] textures = new Texture2D[6];
 
    private DropInfo dropInfo;
 
    private void OnEnable()
    {
        UnityDragAndDropHook.InstallHook();
        UnityDragAndDropHook.OnDroppedFiles += OnFiles;
    }
 
    private void OnDisable()
    {
        UnityDragAndDropHook.UninstallHook();
    }
 
    private void OnFiles(List<string> aFiles, POINT aPos)
    {
        string text = "";
        foreach (string aFile in aFiles)
        {
            switch (new FileInfo(aFile).Extension.ToLower())
            {
            case ".png":
            case ".jpg":
            case ".jpeg":
                text = aFile;
                goto end_IL_0053;
            }
            continue;
            end_IL_0053:
            break;
        }
        if (text != "")
        {
            DropInfo dropInfo = new DropInfo
            {
                file = text,
                pos = new Vector2(aPos.x, aPos.y)
            };
            this.dropInfo = dropInfo;
        }
    }
 
    private void LoadImage(int aIndex, DropInfo aInfo)
    {
        if (aInfo != null && GUILayoutUtility.GetLastRect().Contains(aInfo.pos))
        {
            byte[] data = File.ReadAllBytes(aInfo.file);
            Texture2D texture2D = new Texture2D(1, 1);
            texture2D.LoadImage(data);
            if (textures[aIndex] != null)
            {
                Object.Destroy(textures[aIndex]);
            }
            textures[aIndex] = texture2D;
        }
    }
 
    private void OnGUI()
    {
        DropInfo aInfo = null;
        if (Event.current.type == EventType.Repaint && dropInfo != null)
        {
            aInfo = dropInfo;
            dropInfo = null;
        }
        GUILayout.BeginHorizontal();
        for (int i = 0; i < 3; i++)
        {
            if (textures[i] != null)
            {
                GUILayout.Label(textures[i], GUILayout.Width(200f), GUILayout.Height(200f));
            }
            else
            {
                GUILayout.Box("Drag image here", GUILayout.Width(200f), GUILayout.Height(200f));
            }
            LoadImage(i, aInfo);
        }
        GUILayout.EndHorizontal();
        GUILayout.BeginHorizontal();
        for (int j = 3; j < 6; j++)
        {
            if (textures[j] != null)
            {
                GUILayout.Label(textures[j], GUILayout.Width(200f), GUILayout.Height(200f));
            }
            else
            {
                GUILayout.Box("Drag image here", GUILayout.Width(200f), GUILayout.Height(200f));
            }
            LoadImage(j, aInfo);
        }
        GUILayout.EndHorizontal();
    }
}