424 lines
12 KiB
Dart
424 lines
12 KiB
Dart
import 'dart:io';
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import 'dart:math' as math;
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import 'package:flutter/material.dart';
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import 'package:flutter/gestures.dart';
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import 'package:flutter/services.dart';
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class ImageCanvas extends StatefulWidget {
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final String filePath;
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const ImageCanvas({super.key, required this.filePath});
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@override
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State<ImageCanvas> createState() => _ImageCanvasState();
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}
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class _ImageCanvasState extends State<ImageCanvas> {
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bool _isFilled = true;
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final GlobalKey _imageKey = GlobalKey();
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double _tx = 0, _ty = 0, _sc = 1.0;
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Size _vpSize = Size.zero;
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// ── Görüntü ayarları ──
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double _angle = 0;
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double _contrast = 1.0;
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double _saturation = 1.0;
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double _brightness = 0;
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// ── Gesture tracking ──
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String _interactionMode = 'none'; // 'contrast' | 'rotate' | 'saturation' | 'brightness'
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Offset _pointerDownPos = Offset.zero;
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double _startAngle = 0;
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double _startContrast = 1.0;
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double _startSaturation = 1.0;
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double _startBrightness = 0;
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DateTime? _lastRightTapTime;
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Offset _lastRightTapPos = Offset.zero;
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// ── Klavye modifier tracking ──
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bool _ctrlPressed = false;
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bool _shiftPressed = false;
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void _clamp() {
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if (_vpSize.width <= 0 || _vpSize.height <= 0) return;
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if (_angle != 0) return; // rotate varsa serbest pan
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if (_isFilled) {
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final double w = _vpSize.width * _sc;
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final double h = _vpSize.height * _sc;
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if (w >= _vpSize.width) {
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if (_tx > 0) _tx = 0;
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else if (_tx + w < _vpSize.width) _tx = _vpSize.width - w;
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} else { if (_tx != 0) _tx = 0; }
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if (h >= _vpSize.height) {
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if (_ty > 0) _ty = 0;
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else if (_ty + h < _vpSize.height) _ty = _vpSize.height - h;
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} else { if (_ty != 0) _ty = 0; }
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return;
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}
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double m = 0, n = 0;
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double w = _vpSize.width * _sc;
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double h = _vpSize.height * _sc;
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final box = _imageKey.currentContext?.findRenderObject() as RenderBox?;
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if (box != null && box.hasSize && box.size.width > 0) {
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final Size img = box.size;
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m = (_vpSize.width - img.width) / 2;
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n = (_vpSize.height - img.height) / 2;
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w = img.width * _sc;
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h = img.height * _sc;
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}
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if (w >= _vpSize.width) {
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final double lo = -m * _sc;
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final double hi = _vpSize.width - m * _sc - w;
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if (lo <= hi) {
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if (_tx < lo) _tx = lo;
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if (_tx > hi) _tx = hi;
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} else {
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if (_tx < hi) _tx = hi;
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if (_tx > lo) _tx = lo;
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}
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} else {
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final double lo = -m * _sc;
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final double hi = _vpSize.width - m * _sc - w;
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if (_tx < lo) _tx = lo;
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if (_tx > hi) _tx = hi;
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}
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if (h >= _vpSize.height) {
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final double lo = -n * _sc;
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final double hi = _vpSize.height - n * _sc - h;
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if (lo <= hi) {
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if (_ty < lo) _ty = lo;
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if (_ty > hi) _ty = hi;
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} else {
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if (_ty < hi) _ty = hi;
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if (_ty > lo) _ty = lo;
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}
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} else {
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final double lo = -n * _sc;
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final double hi = _vpSize.height - n * _sc - h;
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if (_ty < lo) _ty = lo;
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if (_ty > hi) _ty = hi;
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}
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}
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@override
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void initState() {
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super.initState();
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HardwareKeyboard.instance.addHandler(_onHardwareKey);
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}
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@override
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void dispose() {
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HardwareKeyboard.instance.removeHandler(_onHardwareKey);
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super.dispose();
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}
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bool _onHardwareKey(KeyEvent event) {
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final key = event.logicalKey;
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if (event is KeyDownEvent) {
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if (key == LogicalKeyboardKey.controlLeft ||
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key == LogicalKeyboardKey.controlRight) {
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_ctrlPressed = true;
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} else if (key == LogicalKeyboardKey.shiftLeft ||
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key == LogicalKeyboardKey.shiftRight) {
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_shiftPressed = true;
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}
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} else if (event is KeyUpEvent) {
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if (key == LogicalKeyboardKey.controlLeft ||
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key == LogicalKeyboardKey.controlRight) {
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_ctrlPressed = false;
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} else if (key == LogicalKeyboardKey.shiftLeft ||
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key == LogicalKeyboardKey.shiftRight) {
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_shiftPressed = false;
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}
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}
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return false;
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}
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@override
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void didUpdateWidget(ImageCanvas old) {
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super.didUpdateWidget(old);
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if (old.filePath != widget.filePath) _resetView();
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}
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void _resetView() {
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setState(() {
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_tx = 0; _ty = 0; _sc = 1.0; _isFilled = true; _vpSize = Size.zero;
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_angle = 0; _contrast = 1.0; _saturation = 1.0; _brightness = 0;
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});
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}
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void _toggleFillFit() {
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setState(() {
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_isFilled = !_isFilled; _tx = 0; _ty = 0; _sc = 1.0; _vpSize = Size.zero;
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_angle = 0; _contrast = 1.0; _saturation = 1.0; _brightness = 0;
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});
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}
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void _handleDoubleTap() => _toggleFillFit();
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void _handleScroll(PointerScrollEvent e) {
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if (_vpSize.width <= 0 || _vpSize.height <= 0) return;
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final double vx = _angle == 0 ? e.localPosition.dx : _vpSize.width / 2;
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final double vy = _angle == 0 ? e.localPosition.dy : _vpSize.height / 2;
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final double cx = (vx - _tx) / _sc;
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final double cy = (vy - _ty) / _sc;
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const double factor = 1.1;
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final double rawSc = _sc * (e.scrollDelta.dy < 0 ? factor : 1.0 / factor);
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final double newSc = rawSc.clamp(1.0, 10.0);
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if (_angle == 0) {
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_tx = _tx + cx * _sc - cx * newSc;
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_ty = _ty + cy * _sc - cy * newSc;
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} else {
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// Rotate'li zoom: viewport merkezini koru
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final double dw = _vpSize.width * (newSc - _sc);
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final double dh = _vpSize.height * (newSc - _sc);
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_tx -= dw / 2;
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_ty -= dh / 2;
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}
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_sc = newSc;
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_clamp();
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setState(() {});
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}
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void _onPanUpdate(DragUpdateDetails d) {
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_tx += d.delta.dx;
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_ty += d.delta.dy;
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_clamp();
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setState(() {});
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}
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void _onPointerDown(PointerDownEvent e) {
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if (e.buttons != kSecondaryMouseButton) return;
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_pointerDownPos = e.localPosition;
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final now = DateTime.now();
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if (_lastRightTapTime != null &&
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now.difference(_lastRightTapTime!) < const Duration(milliseconds: 400) &&
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(e.localPosition - _lastRightTapPos).distance < 20) {
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setState(() {
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_angle = 0;
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_contrast = 1.0;
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_saturation = 1.0;
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_brightness = 0;
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_interactionMode = 'none';
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});
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_lastRightTapTime = null;
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return;
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}
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_lastRightTapTime = now;
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_lastRightTapPos = e.localPosition;
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if (_ctrlPressed && _shiftPressed) {
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_interactionMode = 'brightness';
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_startBrightness = _brightness;
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} else if (_ctrlPressed) {
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_interactionMode = 'saturation';
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_startSaturation = _saturation;
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} else if (_shiftPressed) {
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_interactionMode = 'rotate';
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_startAngle = _angle;
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} else {
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_interactionMode = 'contrast';
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_startContrast = _contrast;
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}
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}
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void _onPointerMove(PointerMoveEvent e) {
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if (e.buttons != kSecondaryMouseButton) return;
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final dy = e.localPosition.dy - _pointerDownPos.dy;
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switch (_interactionMode) {
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case 'contrast':
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setState(() {
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_contrast = (_startContrast + dy * 0.005).clamp(0.0, 2.0);
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});
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break;
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case 'rotate':
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setState(() {
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_angle = _startAngle + dy * 0.9;
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});
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break;
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case 'saturation':
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setState(() {
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_saturation = (_startSaturation + dy * 0.005).clamp(0.0, 2.0);
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});
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break;
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case 'brightness':
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setState(() {
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_brightness = (_startBrightness + dy * 0.5).clamp(-100.0, 100.0);
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});
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break;
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}
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}
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void _onPointerUp(PointerUpEvent e) {
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_interactionMode = 'none';
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}
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// ── Combined color filter (brightness × saturation × contrast) ──
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static const double _rLum = 0.2126;
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static const double _gLum = 0.7152;
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static const double _bLum = 0.0722;
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ColorFilter? _cachedFilter;
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double _cachedSat = -1;
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double _cachedCon = -1;
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double _cachedBri = double.nan;
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List<double> _multiply4x5(List<double> a, List<double> b) {
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final result = List<double>.filled(20, 0.0);
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for (int row = 0; row < 4; row++) {
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for (int col = 0; col < 4; col++) {
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double sum = 0.0;
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for (int k = 0; k < 4; k++) {
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sum += a[row * 5 + k] * b[k * 5 + col];
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}
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result[row * 5 + col] = sum;
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}
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double offsetSum = a[row * 5 + 4];
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for (int k = 0; k < 4; k++) {
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offsetSum += a[row * 5 + k] * b[k * 5 + 4];
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}
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result[row * 5 + 4] = offsetSum;
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}
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return result;
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}
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ColorFilter _buildCombinedFilter() {
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if (_cachedFilter != null &&
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_cachedSat == _saturation &&
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_cachedCon == _contrast &&
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_cachedBri == _brightness) {
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return _cachedFilter!;
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}
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_cachedSat = _saturation;
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_cachedCon = _contrast;
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_cachedBri = _brightness;
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final s = _saturation;
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final c = _contrast;
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final b = _brightness;
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final invS = 1.0 - s;
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final sR_R = invS * _rLum + s, sR_G = invS * _gLum, sR_B = invS * _bLum;
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final sG_R = invS * _rLum, sG_G = invS * _gLum + s, sG_B = invS * _bLum;
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final sB_R = invS * _rLum, sB_G = invS * _gLum, sB_B = invS * _bLum + s;
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final saturationMatrix = <double>[
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sR_R, sR_G, sR_B, 0, 0,
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sG_R, sG_G, sG_B, 0, 0,
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sB_R, sB_G, sB_B, 0, 0,
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0, 0, 0, 1, 0,
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];
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final brightnessMatrix = <double>[
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1, 0, 0, 0, b,
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0, 1, 0, 0, b,
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0, 0, 1, 0, b,
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0, 0, 0, 1, 0,
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];
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final offset = 128.0 * (1.0 - c);
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final contrastMatrix = <double>[
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c, 0, 0, 0, offset,
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0, c, 0, 0, offset,
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0, 0, c, 0, offset,
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0, 0, 0, 1, 0,
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];
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// M_final = M_contrast * M_brightness * M_saturation
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_cachedFilter = ColorFilter.matrix(
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_multiply4x5(_multiply4x5(contrastMatrix, brightnessMatrix), saturationMatrix));
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return _cachedFilter!;
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}
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Widget _buildImage() {
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return Image.file(
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key: _imageKey,
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File(widget.filePath),
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fit: _isFilled ? BoxFit.cover : BoxFit.contain,
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filterQuality: FilterQuality.high,
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errorBuilder: (_, _, _) => _errorWidget(),
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);
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}
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@override
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Widget build(BuildContext context) {
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return LayoutBuilder(
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builder: (context, constraints) {
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_vpSize = constraints.biggest;
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_clamp();
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final vpCenterX = _vpSize.width / 2;
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final vpCenterY = _vpSize.height / 2;
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final angleRad = _angle * math.pi / 180;
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Widget imageContent = Builder(
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builder: (context) {
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final hasFilter = _saturation != 1.0 || _contrast != 1.0 || _brightness != 0.0;
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final image = _isFilled
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? SizedBox.expand(child: _buildImage())
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: Center(child: _buildImage());
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return hasFilter
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? ColorFiltered(colorFilter: _buildCombinedFilter(), child: image)
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: image;
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},
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);
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if (_angle != 0) {
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imageContent = Transform(
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alignment: Alignment.topLeft,
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transform: Matrix4.identity()
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..translate(vpCenterX, vpCenterY)
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..rotateZ(angleRad)
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..translate(-vpCenterX, -vpCenterY),
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child: imageContent,
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);
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}
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return SizedBox.expand(
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child: Stack(
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children: [
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ClipRect(
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child: Listener(
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onPointerDown: _onPointerDown,
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onPointerMove: _onPointerMove,
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onPointerUp: _onPointerUp,
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onPointerSignal: (event) {
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if (event is PointerScrollEvent) _handleScroll(event);
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},
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child: GestureDetector(
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onDoubleTap: _handleDoubleTap,
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onPanUpdate: _onPanUpdate,
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child: Transform(
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alignment: Alignment.topLeft,
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transform: Matrix4.identity()
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..translate(_tx, _ty)
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..scale(_sc),
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child: imageContent,
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),
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),
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),
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),
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],
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),
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);
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},
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);
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}
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Widget _errorWidget() {
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return const Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Icon(Icons.broken_image, size: 48, color: Colors.white38),
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SizedBox(height: 8),
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Text('Resim yüklenemedi', style: TextStyle(color: Colors.white38)),
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],
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),
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);
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}
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}
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