PDF92/crop.html at main · m92vyas/PDF92 · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Crop PDF</title>
    <script src="static/js/app.js"></script>
    <script src="static/js/pdf.min.js"></script>
    <link rel="stylesheet" href="static/css/all.min.css">
    <style>
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 10px; }
        .thumbnail.active { border: 2px solid #10b981; background: #ecfdf5; }
        #crop-canvas { cursor: crosshair; }
        .toggle-btn.active { background: white; box-shadow: 0 1px 3px rgba(0,0,0,0.1); color: #059669; }
    </style>
</head>
<body class="bg-slate-50 h-screen flex flex-col overflow-hidden font-sans">

    <header class="h-16 bg-white border-b flex items-center justify-between px-6 z-50 shrink-0">
        <div class="flex items-center gap-3">
            <div class="w-10 h-10 bg-emerald-600 rounded-xl flex items-center justify-center text-white shadow-lg">
                <i class="fa-solid fa-crop-simple"></i>
            </div>
            <h1 class="text-lg font-bold text-slate-800 tracking-tight">PDF<span class="text-emerald-600">Crop</span></h1>

            <button onclick="pywebview.api.home_page()" class="ml-2 p-2 text-slate-400 hover:text-emerald-600 transition-colors" title="Home">
                <i class="fa-solid fa-house text-lg"></i> Go to Home Page
            </button>
        </div>

        <div id="controls" class="hidden flex items-center gap-6">
            <div class="flex items-center gap-1 bg-slate-100 p-1 rounded-xl border border-slate-200">
                <button id="mode-current" onclick="setApplyMode('current')" class="toggle-btn active px-4 py-1.5 rounded-lg text-xs font-bold transition-all">
                    Apply Crop to Current Page
                </button>
                <button id="mode-all" onclick="setApplyMode('all')" class="toggle-btn px-4 py-1.5 rounded-lg text-xs font-bold transition-all text-slate-500">
                    Apply Crop to All Pages
                </button>
            </div>

            <button onclick="openFile()" class="bg-white border border-slate-200 hover:bg-slate-50 text-slate-700 px-5 py-2 rounded-lg text-sm font-bold transition-all flex items-center gap-2">
                <i class="fa-solid fa-plus"></i> Upload New File
            </button>

            <button onclick="saveAndProcess()" class="bg-slate-900 hover:bg-emerald-600 text-white px-5 py-2 rounded-lg text-sm font-bold transition-all flex items-center gap-2">
                <i class="fa-solid fa-file-export"></i> Save Cropped PDF
            </button>
        </div>
    </header>

    <main class="flex-1 flex overflow-hidden">
        <aside id="sidebar" class="hidden w-64 bg-white border-r flex flex-col">
            <div class="p-4 border-b">
                <p class="text-[10px] font-bold uppercase text-slate-400">Pages</p>
            </div>
            <div id="thumbnail-container" class="flex-1 overflow-y-auto p-4 space-y-4"></div>
        </aside>

        <section class="flex-1 relative overflow-auto bg-slate-200 flex justify-center p-8">
            <div id="upload-zone" class="m-auto text-center bg-white p-12 rounded-3xl shadow-xl border-2 border-dashed border-slate-300 hover:border-emerald-500 cursor-pointer transition-all w-full max-w-md" onclick="openFile()">
                <i class="fa-solid fa-cloud-arrow-up text-5xl text-emerald-500 mb-4"></i>
                <h3 class="text-xl font-bold text-slate-800">Select PDF</h3>
                <p class="text-slate-500 text-sm mt-2">Open a multipage PDF to start cropping</p>
            </div>

            <div id="pdf-container" class="hidden relative shadow-2xl bg-white">
                <canvas id="main-canvas"></canvas>
                <canvas id="crop-canvas" class="absolute top-0 left-0"></canvas>
            </div>
        </section>
    </main>

    <div id="pagination" class="hidden fixed bottom-6 left-1/2 -translate-x-1/2 bg-white/90 backdrop-blur shadow-2xl border px-4 py-2 rounded-2xl flex items-center gap-4">
        <button onclick="changePage(-1)" class="p-2 hover:text-emerald-600"><i class="fa-solid fa-chevron-left"></i></button>
        <div class="flex items-center gap-2 font-bold text-sm">
            <input type="number" id="page-num" class="w-12 text-center border rounded p-1" min="1">
            <span class="text-slate-400">/</span>
            <span id="page-count">0</span>
        </div>
        <button onclick="changePage(1)" class="p-2 hover:text-emerald-600"><i class="fa-solid fa-chevron-right"></i></button>
    </div>

    <script>
        pdfjsLib.GlobalWorkerOptions.workerSrc = './static/js/pdf.worker.min.js'

        let pdfDoc = null,
            pageNum = 1,
            currentPath = '',
            scale = 1.5,
            crops = {},
            applyMode = 'current';

        const mainCanvas = document.getElementById('main-canvas');
        const cropCanvas = document.getElementById('crop-canvas');
        const ctx = mainCanvas.getContext('2d');
        const cCtx = cropCanvas.getContext('2d');

        let isDrawing = false, isMoving = false, isResizing = false;
        let startX, startY, dragHandle = null;
        const handleSize = 8;
        const deleteSize = 20;

        function setApplyMode(mode) {
            applyMode = mode;
            document.getElementById('mode-current').classList.toggle('active', mode === 'current');
            document.getElementById('mode-all').classList.toggle('active', mode === 'all');
            document.getElementById('mode-current').classList.toggle('text-slate-500', mode !== 'current');
            document.getElementById('mode-all').classList.toggle('text-slate-500', mode !== 'all');
        }

        async function openFile() {
            const path = await pywebview.api.get_file_path();
            if (!path) return;

            currentPath = path;
            const base64 = await pywebview.api.load_pdf_as_base64(path);
            const loadingTask = pdfjsLib.getDocument({data: atob(base64)});

            pdfDoc = await loadingTask.promise;
            document.getElementById('upload-zone').classList.add('hidden');
            document.getElementById('sidebar').classList.remove('hidden');
            document.getElementById('pdf-container').classList.remove('hidden');
            document.getElementById('pagination').classList.remove('hidden');
            document.getElementById('controls').classList.remove('hidden');

            document.getElementById('page-count').textContent = pdfDoc.numPages;
            renderThumbnails();
            renderPage(1);
        }

        async function renderPage(num) {
            pageNum = num;
            const page = await pdfDoc.getPage(num);
            const viewport = page.getViewport({scale});

            mainCanvas.height = viewport.height;
            mainCanvas.width = viewport.width;
            cropCanvas.height = viewport.height;
            cropCanvas.width = viewport.width;

            await page.render({canvasContext: ctx, viewport}).promise;
            document.getElementById('page-num').value = num;

            document.querySelectorAll('.thumbnail').forEach(el => el.classList.remove('active'));

            const activeThumb = document.getElementById(`thumb-${num}`);
            if (activeThumb) {
                activeThumb.classList.add('active');

                activeThumb.scrollIntoView({
                    behavior: 'smooth',
                    block: 'nearest'
                });
            }

            drawExistingCrop();
        }

        async function renderThumbnails() {
            const container = document.getElementById('thumbnail-container');
            container.innerHTML = '';
            for (let i = 1; i <= pdfDoc.numPages; i++) {
                const page = await pdfDoc.getPage(i);
                const viewport = page.getViewport({scale: 0.2});
                const canvas = document.createElement('canvas');
                canvas.id = `thumb-${i}`;
                canvas.className = 'thumbnail w-full rounded shadow-sm cursor-pointer hover:ring-2 ring-emerald-400 transition-all';
                canvas.onclick = () => renderPage(i);
                container.appendChild(canvas);

                const context = canvas.getContext('2d');
                canvas.height = viewport.height;
                canvas.width = viewport.width;
                await page.render({canvasContext: context, viewport}).promise;
            }
        }

        function changePage(delta) {
            let newPage = pageNum + delta;
            if (newPage >= 1 && newPage <= pdfDoc.numPages) renderPage(newPage);
        }

        document.getElementById('page-num').addEventListener('change', (e) => {
            let val = parseInt(e.target.value);
            if (val >= 1 && val <= pdfDoc.numPages) renderPage(val);
        });

        function getHandle(x, y, crop) {
            if (!crop) return null;
            const c = { x: crop.x * scale, y: crop.y * scale, w: crop.width * scale, h: crop.height * scale };
            const handles = {
                nw: { x: c.x, y: c.y },
                ne: { x: c.x + c.w, y: c.y },
                sw: { x: c.x, y: c.y + c.h },
                se: { x: c.x + c.w, y: c.y + c.h }
            };
            for (let h in handles) {
                if (Math.abs(x - handles[h].x) <= handleSize && Math.abs(y - handles[h].y) <= handleSize) return h;
            }
            return null;
        }

        function isOverDeleteIcon(x, y, crop) {
            if (!crop) return false;
            const cx = crop.x * scale, cy = crop.y * scale, cw = crop.width * scale;
            const iconX = cx + cw - 25; // 25px from right
            const iconY = cy + 10;      // 10px from top
            return x >= iconX && x <= iconX + deleteSize && y >= iconY && y <= iconY + deleteSize;
        }

        function isInside(x, y, crop) {
            if (!crop) return false;
            const cx = crop.x * scale, cy = crop.y * scale, cw = crop.width * scale, ch = crop.height * scale;
            return x >= cx && x <= cx + cw && y >= cy && y <= cy + ch;
        }

        cropCanvas.onmousedown = (e) => {
            const rect = cropCanvas.getBoundingClientRect();
            const x = e.clientX - rect.left;
            const y = e.clientY - rect.top;
            const crop = crops[pageNum - 1];

            // 1. Check Delete Icon first
            if (isOverDeleteIcon(x, y, crop)) {
                crops[pageNum - 1] = null;
                drawExistingCrop();
                return;
            }

            // 2. Check Resize handles
            const handle = getHandle(x, y, crop);
            if (handle) {
                isResizing = true;
                dragHandle = handle;
            }
            // 3. Check Move
            else if (isInside(x, y, crop)) {
                isMoving = true;
                startX = x - (crop.x * scale);
                startY = y - (crop.y * scale);
            }
            // 4. Start Drawing New
            else {
                isDrawing = true;
                startX = x;
                startY = y;
                crops[pageNum - 1] = null;
            }
        };

        cropCanvas.onmousemove = (e) => {
            const rect = cropCanvas.getBoundingClientRect();
            const x = e.clientX - rect.left;
            const y = e.clientY - rect.top;
            const crop = crops[pageNum - 1];

            if (!isDrawing && !isMoving && !isResizing) {
                const handle = getHandle(x, y, crop);
                if (isOverDeleteIcon(x, y, crop)) {
                    cropCanvas.style.cursor = 'pointer';
                } else if (handle) {
                    cropCanvas.style.cursor = (handle === 'nw' || handle === 'se') ? 'nwse-resize' : 'nesw-resize';
                } else if (isInside(x, y, crop)) {
                    cropCanvas.style.cursor = 'move';
                } else {
                    cropCanvas.style.cursor = 'crosshair';
                }
            }

            if (isDrawing) {
                const w = (x - startX) / scale;
                const h = (y - startY) / scale;
                crops[pageNum - 1] = { pageIndex: pageNum-1, x: startX/scale, y: startY/scale, width: w, height: h };
            } else if (isMoving) {
                crop.x = (x - startX) / scale;
                crop.y = (y - startY) / scale;
            } else if (isResizing) {
                const cx = crop.x * scale, cy = crop.y * scale, cw = crop.width * scale, ch = crop.height * scale;
                if (dragHandle === 'nw') {
                    crop.x = x / scale; crop.y = y / scale;
                    crop.width = (cx + cw - x) / scale; crop.height = (cy + ch - y) / scale;
                } else if (dragHandle === 'ne') {
                    crop.y = y / scale;
                    crop.width = (x - cx) / scale; crop.height = (cy + ch - y) / scale;
                } else if (dragHandle === 'sw') {
                    crop.x = x / scale;
                    crop.width = (cx + cw - x) / scale; crop.height = (y - cy) / scale;
                } else if (dragHandle === 'se') {
                    crop.width = (x - cx) / scale; crop.height = (y - cy) / scale;
                }
            }
            if (isDrawing || isMoving || isResizing) drawExistingCrop();
        };

        cropCanvas.onmouseup = () => {
            const crop = crops[pageNum - 1];
            if (crop && (isDrawing || isResizing)) {
                if (crop.width < 0) { crop.x += crop.width; crop.width = Math.abs(crop.width); }
                if (crop.height < 0) { crop.y += crop.height; crop.height = Math.abs(crop.height); }
            }
            isDrawing = isMoving = isResizing = false;
            dragHandle = null;
            drawExistingCrop();
        };

        function drawExistingCrop() {
            cCtx.clearRect(0, 0, cropCanvas.width, cropCanvas.height);
            const crop = crops[pageNum - 1];
            if (!crop) return;

            const cx = crop.x * scale, cy = crop.y * scale, cw = crop.width * scale, ch = crop.height * scale;

            // Draw Main Box
            cCtx.strokeStyle = '#10b981';
            cCtx.lineWidth = 2;
            cCtx.strokeRect(cx, cy, cw, ch);
            cCtx.fillStyle = 'rgba(16, 185, 129, 0.15)';
            cCtx.fillRect(cx, cy, cw, ch);

            // Draw Resize Handles
            cCtx.fillStyle = '#10b981';
            [[cx, cy], [cx + cw, cy], [cx, cy + ch], [cx + cw, cy + ch]].forEach(([hx, hy]) => {
                cCtx.fillRect(hx - 4, hy - 4, 8, 8);
            });

            // Draw Delete Icon (Red Circle with X)
            const iconX = cx + cw - 25;
            const iconY = cy + 10;

            cCtx.fillStyle = '#ef4444'; // Tailwind red-500
            cCtx.beginPath();
            cCtx.arc(iconX + 10, iconY + 10, 10, 0, Math.PI * 2);
            cCtx.fill();

            cCtx.strokeStyle = 'white';
            cCtx.lineWidth = 2;
            cCtx.beginPath();
            cCtx.moveTo(iconX + 6, iconY + 6);
            cCtx.lineTo(iconX + 14, iconY + 14);
            cCtx.moveTo(iconX + 14, iconY + 6);
            cCtx.lineTo(iconX + 6, iconY + 14);
            cCtx.stroke();
        }

        async function saveAndProcess() {
            const currentIdx = pageNum - 1;
            const sourceCrop = crops[currentIdx];

            if (!sourceCrop) {
                alert("Please draw a crop box on the current page first.");
                return;
            }

            let finalCrops = {};

            if (applyMode === 'all') {
                let conflictingPages = [];
                for (let i = 0; i < pdfDoc.numPages; i++) {
                    if (i !== currentIdx && crops[i]) {
                        conflictingPages.push(i + 1);
                    }
                }

                if (conflictingPages.length > 0) {
                    const msg = `Pages ${conflictingPages.join(', ')} already have crop boxes. These will be replaced by the current page's crop box. Proceed?`;
                    if (!confirm(msg)) return;
                }

                for (let i = 0; i < pdfDoc.numPages; i++) {
                    finalCrops[i] = { ...sourceCrop, pageIndex: i };
                }
            } else {
                finalCrops = crops;
            }

            const payload_save = {
                filePath: currentPath,
            };
            const savePath = await pywebview.api.save_file_path(JSON.stringify(payload_save));
            if (!savePath) return;

            const payload = {
                filePath: currentPath,
                savePath: savePath,
                crops: Object.values(finalCrops).filter(c => c !== null)
            };

            const success = await pywebview.api.process_crop(JSON.stringify(payload));
            if (success) alert("PDF cropped and saved successfully!");
        }
    </script>
</body>
</html>