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from .labwidget import Widget, Property, minify
import html
class PaintWidget(Widget):
def __init__(self,
width=256, height=256,
image='', mask='', brushsize=10.0, oneshot=False, disabled=False,
vanishing=True, opacity=0.7,
**kwargs):
super().__init__(**kwargs)
self.mask = Property(mask)
self.image = Property(image)
self.vanishing = Property(vanishing)
self.brushsize = Property(brushsize)
self.erase = Property(False)
self.oneshot = Property(oneshot)
self.disabled = Property(disabled)
self.width = Property(width)
self.height = Property(height)
self.opacity = Property(opacity)
self.startpos = Property(None)
self.dragpos = Property(None)
self.dragging = Property(False)
def widget_js(self):
return minify(f'''
{PAINT_WIDGET_JS}
var pw = new PaintWidget(element, model);
''')
def widget_html(self):
v = self.view_id()
return minify(f'''
<style>
#{v} {{ position: relative; display: inline-block; }}
#{v} .paintmask {{
position: absolute; top:0; left: 0; z-index: 1;
opacity: { self.opacity } }}
#{v} .paintmask.vanishing {{
opacity: 0; transition: opacity .1s ease-in-out; }}
#{v} .paintmask.vanishing:hover {{ opacity: { self.opacity }; }}
</style>
<div id="{v}"></div>
''')
PAINT_WIDGET_JS = """
class PaintWidget {
constructor(el, model) {
this.el = el;
this.model = model;
this.size_changed();
this.model.on('mask', this.mask_changed.bind(this));
this.model.on('image', this.image_changed.bind(this));
this.model.on('vanishing', this.mask_changed.bind(this));
this.model.on('width', this.size_changed.bind(this));
this.model.on('height', this.size_changed.bind(this));
}
mouse_stroke(first_event) {
var self = this;
if (first_event.which === 3 || first_event.button === 2) {
first_event.preventDefault();
self.mask_canvas.style.pointerEvents = 'none';
setTimeout(() => {
self.mask_canvas.style.pointerEvents = 'all';
}, 3000);
return;
}
if (self.model.get('disabled')) { return; }
if (self.model.get('oneshot')) {
var canvas = self.mask_canvas;
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
function track_mouse(evt) {
if (evt.type == 'keydown' || self.model.get('disabled')) {
if (self.model.get('disabled') || evt.key === "Escape") {
window.removeEventListener('mousemove', track_mouse);
window.removeEventListener('mouseup', track_mouse);
window.removeEventListener('keydown', track_mouse, true);
if (self.model.get('dragging')) {
self.model.set('dragging', false);
}
self.mask_changed();
}
return;
}
if (evt.type == 'mouseup' ||
(typeof evt.buttons != 'undefined' && evt.buttons == 0)) {
window.removeEventListener('mousemove', track_mouse);
window.removeEventListener('mouseup', track_mouse);
window.removeEventListener('keydown', track_mouse, true);
self.model.set('dragging', false);
self.model.set('mask', self.mask_canvas.toDataURL());
return;
}
var p = self.cursor_position(evt);
var d = self.model.get('dragging');
var e = self.model.get('erase') ^ (evt.ctrlKey);
if (!d) { self.model.set('startpos', [p.x, p.y]); }
self.model.set('dragpos', [p.x, p.y]);
if (!d) { self.model.set('dragging', true); }
self.fill_circle(p.x, p.y,
self.model.get('brushsize'),
e);
}
this.mask_canvas.focus();
window.addEventListener('mousemove', track_mouse);
window.addEventListener('mouseup', track_mouse);
window.addEventListener('keydown', track_mouse, true);
track_mouse(first_event);
}
mask_changed() {
this.mask_canvas.classList.toggle("vanishing", this.model.get('vanishing'));
this.draw_data_url(this.mask_canvas, this.model.get('mask'));
}
image_changed() {
this.image.src = this.model.get('image');
}
size_changed() {
this.mask_canvas = document.createElement('canvas');
this.image = document.createElement('img');
this.mask_canvas.className = "paintmask";
this.image.className = "paintimage";
for (var attr of ['width', 'height']) {
this.mask_canvas[attr] = this.model.get(attr);
this.image[attr] = this.model.get(attr);
}
this.el.innerHTML = '';
this.el.appendChild(this.image);
this.el.appendChild(this.mask_canvas);
this.mask_canvas.addEventListener('mousedown',
this.mouse_stroke.bind(this));
this.mask_changed();
this.image_changed();
}
cursor_position(evt) {
const rect = this.mask_canvas.getBoundingClientRect();
const x = event.clientX - rect.left;
const y = event.clientY - rect.top;
return {x: x, y: y};
}
fill_circle(x, y, r, erase, blur) {
var ctx = this.mask_canvas.getContext('2d');
ctx.save();
if (blur) {
ctx.filter = 'blur(' + blur + 'px)';
}
ctx.globalCompositeOperation = (
erase ? "destination-out" : 'source-over');
ctx.fillStyle = '#fff';
ctx.beginPath();
ctx.arc(x, y, r, 0, 2 * Math.PI);
ctx.fill();
ctx.restore()
}
draw_data_url(canvas, durl) {
var ctx = canvas.getContext('2d');
var img = new Image;
canvas.pendingImg = img;
function imgdone() {
if (canvas.pendingImg == img) {
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(img, 0, 0);
canvas.pendingImg = null;
}
}
img.addEventListener('load', imgdone);
img.addEventListener('error', imgdone);
img.src = durl;
}
}
"""
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