feat: add custom print preview dialog with configurable options

2026-08-02 18:10:18 +05:30 · 2026-03-04 16:04:51 +05:30
parent 9348b2bd1d
commit ca0b250506
6 changed files with 357 additions and 24 deletions
@@ -0,0 +1,139 @@
+class PrintPreview {
+    constructor() {
+        this.overlay = document.getElementById('print-preview-overlay');
+        this._lastContent = '';
+        this.setupEventListeners();
+    }
+
+    open(htmlContent) {
+        this._lastContent = htmlContent;
+        this.overlay.classList.remove('hidden');
+        this.updatePreview(htmlContent);
+        this.updateScaleLabel();
+    }
+
+    close() {
+        this.overlay.classList.add('hidden');
+    }
+
+    setupEventListeners() {
+        document.getElementById('print-preview-close')?.addEventListener('click', () => this.close());
+        document.getElementById('print-cancel')?.addEventListener('click', () => this.close());
+        document.getElementById('print-execute')?.addEventListener('click', () => this.executePrint());
+
+        // Update preview on option changes
+        ['print-paper-size', 'print-orientation', 'print-margins'].forEach(id => {
+            document.getElementById(id)?.addEventListener('change', () => this.refreshPreview());
+        });
+
+        // Scale slider
+        const scaleSlider = document.getElementById('print-scale');
+        scaleSlider?.addEventListener('input', () => this.updateScaleLabel());
+
+        // Page range toggle
+        document.getElementById('print-pages')?.addEventListener('change', (e) => {
+            const rangeInput = document.getElementById('print-page-range');
+            if (rangeInput) {
+                rangeInput.classList.toggle('hidden', e.target.value !== 'custom');
+            }
+        });
+
+        // Close on overlay click
+        this.overlay?.addEventListener('click', (e) => {
+            if (e.target === this.overlay) this.close();
+        });
+
+        // Close on Escape
+        document.addEventListener('keydown', (e) => {
+            if (e.key === 'Escape' && !this.overlay.classList.contains('hidden')) {
+                this.close();
+            }
+        });
+    }
+
+    updateScaleLabel() {
+        const scale = document.getElementById('print-scale')?.value || 100;
+        const label = document.getElementById('print-scale-value');
+        if (label) label.textContent = `${scale}%`;
+    }
+
+    updatePreview(htmlContent) {
+        const frame = document.getElementById('print-preview-frame');
+        if (!frame) return;
+
+        this._lastContent = htmlContent;
+
+        const orientation = document.getElementById('print-orientation')?.value || 'portrait';
+        const paperSize = document.getElementById('print-paper-size')?.value || 'A4';
+
+        // Get dimensions for paper size
+        const sizes = {
+            'A3': { width: '297mm', height: '420mm' },
+            'A4': { width: '210mm', height: '297mm' },
+            'A5': { width: '148mm', height: '210mm' },
+            'Letter': { width: '8.5in', height: '11in' },
+            'Legal': { width: '8.5in', height: '14in' },
+            'Tabloid': { width: '11in', height: '17in' },
+        };
+
+        const size = sizes[paperSize] || sizes['A4'];
+        const width = orientation === 'landscape' ? size.height : size.width;
+        const height = orientation === 'landscape' ? size.width : size.height;
+
+        const previewHtml = `
+            <!DOCTYPE html>
+            <html>
+            <head>
+                <style>
+                    body {
+                        margin: 20px;
+                        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+                        font-size: 14px;
+                        line-height: 1.6;
+                    }
+                    @page { size: ${width} ${height}; }
+                    pre { background: #f5f5f5; padding: 12px; border-radius: 6px; overflow-x: auto; }
+                    code { background: #f0f0f0; padding: 2px 6px; border-radius: 3px; font-size: 13px; }
+                    pre code { background: none; padding: 0; }
+                    table { border-collapse: collapse; width: 100%; }
+                    th, td { border: 1px solid #ddd; padding: 8px; }
+                    blockquote { border-left: 4px solid #ddd; margin-left: 0; padding-left: 16px; color: #666; }
+                    img { max-width: 100%; }
+                    h1, h2, h3 { margin-top: 1.5em; }
+                </style>
+            </head>
+            <body>${htmlContent || ''}</body>
+            </html>
+        `;
+
+        frame.srcdoc = previewHtml;
+    }
+
+    refreshPreview() {
+        if (this._lastContent) {
+            this.updatePreview(this._lastContent);
+        }
+    }
+
+    getOptions() {
+        return {
+            paperSize: document.getElementById('print-paper-size')?.value || 'A4',
+            orientation: document.getElementById('print-orientation')?.value || 'portrait',
+            margins: document.getElementById('print-margins')?.value || 'default',
+            scale: parseInt(document.getElementById('print-scale')?.value || '100'),
+            headers: document.getElementById('print-headers')?.checked ?? true,
+            background: document.getElementById('print-background')?.checked ?? true,
+            pages: document.getElementById('print-pages')?.value || 'all',
+            pageRange: document.getElementById('print-page-range')?.value || '',
+        };
+    }
+
+    executePrint() {
+        const options = this.getOptions();
+        const { ipcRenderer } = require('electron');
+        ipcRenderer.send('do-print-with-options', options);
+        this.close();
+    }
+}
+
+module.exports = { PrintPreview };