bc7c754ce3
bug: skia:12000 Change-Id: I40f130b0eab21ef4a53ee88eed8f62c4f3a577c1 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/408899 Commit-Queue: Mike Reed <reed@google.com> Reviewed-by: Yegor Jbanov <yjbanov@google.com>
660 lines
21 KiB
JavaScript
660 lines
21 KiB
JavaScript
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function ASSERT(pred) {
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console.assert(pred, 'assert failed');
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}
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function LOG(...args) {
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// comment out for non-debugging
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// console.log(args);
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}
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function MakeCursor(CanvasKit) {
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const linePaint = new CanvasKit.Paint();
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linePaint.setColor([0,0,1,1]);
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linePaint.setStyle(CanvasKit.PaintStyle.Stroke);
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linePaint.setStrokeWidth(2);
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linePaint.setAntiAlias(true);
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const pathPaint = new CanvasKit.Paint();
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pathPaint.setColor([0,0,1,0.25]);
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linePaint.setAntiAlias(true);
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return {
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_line_paint: linePaint, // wrap in weak-ref so we can delete it?
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_path_paint: pathPaint,
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_x: 0,
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_top: 0,
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_bottom: 0,
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_path: null, // only use x,top,bottom if path is null
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_draws_per_sec: 2,
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// pass 0 for no-draw, pass inf. for always on
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setBlinkRate: function(blinks_per_sec) {
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this._draws_per_sec = blinks_per_sec;
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},
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place: function(x, top, bottom) {
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this._x = x;
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this._top = top;
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this._bottom = bottom;
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this._path = null;
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},
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setPath: function(path) {
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this._path = path;
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},
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draw_before: function(canvas) {
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if (this._path) {
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canvas.drawPath(this._path, this._path_paint);
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}
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},
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draw_after: function(canvas) {
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if (this._path) {
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return;
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}
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if (Math.floor(Date.now() * this._draws_per_sec / 1000) & 1) {
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canvas.drawLine(this._x, this._top, this._x, this._bottom, this._line_paint);
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}
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},
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};
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}
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function MakeMouse() {
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return {
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_start_x: 0, _start_y: 0,
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_curr_x: 0, _curr_y: 0,
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_active: false,
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isActive: function() {
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return this._active;
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},
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setDown: function(x, y) {
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this._start_x = this._curr_x = x;
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this._start_y = this._curr_y = y;
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this._active = true;
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},
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setMove: function(x, y) {
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this._curr_x = x;
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this._curr_y = y;
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},
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setUp: function(x, y) {
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this._curr_x = x;
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this._curr_y = y;
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this._active = false;
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},
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getPos: function(dx, dy) {
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return [ this._start_x + dx, this._start_y + dy, this._curr_x + dx, this._curr_y + dy ];
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},
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};
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}
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function runs_x_to_index(runs, x) {
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for (const r of runs) {
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for (let i = 1; i < r.offsets.length; i += 1) {
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if (x < r.positions[i*2]) {
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const mid = (r.positions[i*2-2] + r.positions[i*2]) * 0.5;
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if (x <= mid) {
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return r.offsets[i-1];
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} else {
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return r.offsets[i];
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}
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}
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}
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}
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const r = runs[runs.length-1];
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return r.offsets[r.offsets.length-1];
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}
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function lines_pos_to_index(lines, x, y) {
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if (y < lines[0].top) {
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return 0;
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}
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for (const l of lines) {
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if (y <= l.bottom) {
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return runs_x_to_index(l.runs, x);
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}
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}
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return lines[lines.length - 1].textRange.last;
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}
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function runs_index_to_run(runs, index) {
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for (const r of runs) {
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if (index <= r.offsets[r.offsets.length-1]) {
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return r;
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}
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}
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return runs[runs.length-1]; // last run
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}
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function runs_index_to_x(runs, index) {
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const r = runs_index_to_run(runs, index);
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for (const i in r.offsets) {
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if (index == r.offsets[i]) {
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return r.positions[i*2];
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}
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}
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return r.positions[r.positions.length-2]; // last x
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}
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function lines_index_to_line_index(lines, index) {
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let i = 0;
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for (const l of lines) {
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if (index <= l.textRange.last) {
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return i;
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}
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i += 1;
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}
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return lines.length-1;
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}
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function lines_index_to_line(lines, index) {
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return lines[lines_index_to_line_index(lines, index)];
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}
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function lines_index_to_x(lines, index) {
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for (const l of lines) {
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if (index <= l.textRange.last) {
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return runs_index_to_x(l.runs, index);
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}
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}
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}
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function lines_indices_to_path(lines, a, b, width) {
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if (a == b) {
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return null;
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}
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if (a > b) { [a, b] = [b, a]; }
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const path = new CanvasKit.Path();
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const la = lines_index_to_line(lines, a);
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const lb = lines_index_to_line(lines, b);
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const ax = runs_index_to_x(la.runs, a);
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const bx = runs_index_to_x(lb.runs, b);
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if (la == lb) {
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path.addRect([ax, la.top, bx, la.bottom]);
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} else {
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path.addRect([ax, la.top, width, la.bottom]);
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path.addRect([0, lb.top, bx, lb.bottom]);
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if (la.bottom < lb.top) {
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path.addRect([0, la.bottom, width, lb.top]); // extra lines inbetween
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}
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}
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return path;
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}
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function string_del(str, start, end) {
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return str.slice(0, start) + str.slice(end, str.length);
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}
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function make_default_paint() {
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const p = new CanvasKit.Paint();
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p.setAntiAlias(true);
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return p;
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}
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function make_default_font(tf) {
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const font = new CanvasKit.Font(tf);
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font.setSubpixel(true);
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return font;
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}
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function MakeStyle(length) {
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return {
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_length: length,
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typeface: null,
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size: null,
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color: null,
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bold: null,
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italic: null,
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underline: null,
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_check_toggle: function(src, dst) {
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if (src == 'toggle') {
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return !dst;
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} else {
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return src;
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}
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},
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// returns true if we changed something affecting layout
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mergeFrom: function(src) {
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let layoutChanged = false;
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if (src.typeface && this.typeface !== src.typeface) {
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this.typeface = src.typeface;
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layoutChanged = true;
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}
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if (src.size && this.size !== src.size) {
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this.size = src.size;
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layoutChanged = true;
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}
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if (src.color) { this.color = src.color; }
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if (src.bold) {
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this.bold = this._check_toggle(src.bold, this.bold);
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}
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if (src.italic) {
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this.italic = this._check_toggle(src.italic, this.italic);
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}
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if (src.underline) {
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this.underline = this._check_toggle(src.underline, this.underline);
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}
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if (src.size_add) {
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this.size += src.size_add;
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layoutChanged = true;
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}
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return layoutChanged;
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}
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};
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}
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function MakeEditor(text, style, cursor, width) {
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const ed = {
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_text: text,
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_lines: null,
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_cursor: cursor,
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_width: width,
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_index: { start: 0, end: 0 },
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_styles: null,
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// drawing
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_X: 0,
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_Y: 0,
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_paint: make_default_paint(),
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_font: make_default_font(style.typeface),
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getLines: function() { return this._lines; },
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width: function() {
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return this._width;
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},
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height: function() {
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return this._lines[this._lines.length-1].bottom;
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},
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bounds: function() {
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return [this._X, this._Y, this._X + this.width(), this._Y + this.height()];
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},
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setXY: function(x, y) {
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this._X = x;
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this._Y = y;
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},
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_rebuild_selection: function() {
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const a = this._index.start;
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const b = this._index.end;
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ASSERT(a >= 0 && a <= b && b <= this._text.length);
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if (a === b) {
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const l = lines_index_to_line(this._lines, a);
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const x = runs_index_to_x(l.runs, a);
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this._cursor.place(x, l.top, l.bottom);
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} else {
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this._cursor.setPath(lines_indices_to_path(this._lines, a, b, this._width));
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}
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},
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setIndex: function(i) {
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this._index.start = this._index.end = i;
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this._rebuild_selection();
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},
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setIndices: function(a, b) {
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if (a > b) { [a, b] = [b, a]; }
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this._index.start = a;
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this._index.end = b;
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this._rebuild_selection();
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},
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moveDX: function(dx) {
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let index;
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if (this._index.start == this._index.end) {
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// just adjust and pin
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index = Math.max(Math.min(this._index.start + dx, this._text.length), 0);
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} else {
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// 'deselect' the region, and turn it into just a single index
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index = dx < 0 ? this._index.start : this._index.end;
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}
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this.setIndex(index);
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},
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moveDY: function(dy) {
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let index = (dy < 0) ? this._index.start : this._index.end;
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const i = lines_index_to_line_index(this._lines, index);
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if (dy < 0 && i == 0) {
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index = 0;
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} else if (dy > 0 && i == this._lines.length - 1) {
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index = this._text.length;
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} else {
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const x = runs_index_to_x(this._lines[i].runs, index);
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// todo: statefully track "original" x when an up/down sequence started,
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// so we can avoid drift.
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index = runs_x_to_index(this._lines[i+dy].runs, x);
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}
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this.setIndex(index);
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},
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_validateStyles: function() {
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let len = 0;
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for (const s of this._styles) {
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len += s._length;
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}
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ASSERT(len === this._text.length);
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},
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_validateBlocks: function(blocks) {
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let len = 0;
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for (const b of blocks) {
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len += b.length;
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}
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ASSERT(len === this._text.length);
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},
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_buildLines: function() {
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this._validateStyles();
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const build_sparse = true;
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const blocks = [];
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let block = null;
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for (const s of this._styles) {
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if (build_sparse) {
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if (!block || (block.typeface === s.typeface && block.size === s.size)) {
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if (!block) {
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block = { length: 0, typeface: s.typeface, size: s.size };
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}
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block.length += s._length;
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} else {
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blocks.push(block);
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block = { length: s._length, typeface: s.typeface, size: s.size };
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}
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} else {
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// force a block on every style boundary for now
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blocks.push({ length: s._length, typeface: s.typeface, size: s.size });
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}
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}
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if (build_sparse) {
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blocks.push(block);
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}
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this._validateBlocks(blocks);
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this._lines = CanvasKit.ParagraphBuilder.ShapeText(this._text, blocks, this._width);
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this._rebuild_selection();
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// add textRange to each run, to aid in drawing
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this._runs = [];
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for (const l of this._lines) {
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for (const r of l.runs) {
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r.textRange = { start: r.offsets[0], end: r.offsets[r.offsets.length-1] };
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this._runs.push(r);
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}
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}
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},
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// note: this does not rebuild lines/runs, or update the cursor,
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// but it does edit the text and styles
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// returns true if it deleted anything
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_deleteRange: function(start, end) {
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ASSERT(start >= 0 && end <= this._text.length);
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ASSERT(start <= end);
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if (start === end) {
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return false;
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}
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this._delete_style_range(start, end);
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// Do this after shrink styles (we use text.length in an assert)
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this._text = string_del(this._text, start, end);
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},
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deleteSelection: function() {
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let start = this._index.start;
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if (start == this._index.end) {
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if (start == 0) {
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return; // nothing to do
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}
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this._deleteRange(start - 1, start);
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start -= 1;
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} else {
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this._deleteRange(start, this._index.end);
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}
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this._index.start = this._index.end = start;
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this._buildLines();
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},
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insert: function(charcode) {
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if (this._index.start != this._index.end) {
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this.deleteSelection();
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}
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const index = this._index.start;
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// do this before edit the text (we use text.length in an assert)
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const [i, prev_len] = this.find_style_index_and_prev_length(index);
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this._styles[i]._length += 1;
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// now grow the text
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this._text = this._text.slice(0, index) + charcode + this._text.slice(index);
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this._index.start = this._index.end = index + 1;
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this._buildLines();
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},
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draw: function(canvas) {
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canvas.save();
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canvas.translate(this._X, this._Y);
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this._cursor.draw_before(canvas);
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const runs = this._runs;
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const styles = this._styles;
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const f = this._font;
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const p = this._paint;
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let s = styles[0];
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let sindex = 0;
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let s_start = 0;
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let s_end = s._length;
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let r = runs[0];
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let rindex = 0;
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let start = 0;
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let end = 0;
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while (start < this._text.length) {
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while (r.textRange.end <= start) {
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r = runs[++rindex];
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if (!r) {
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// ran out of runs, so the remaining text must just be WS
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break;
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}
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}
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if (!r) break;
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while (s_end <= start) {
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s = styles[++sindex];
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s_start = s_end;
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s_end += s._length;
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}
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end = Math.min(r.textRange.end, s_end);
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LOG('New range: ', start, end,
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'from run', r.textRange.start, r.textRange.end,
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'style', s_start, s_end);
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// check that we have anything to draw
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if (r.textRange.start >= end) {
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start = end;
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continue; // could be a span of WS with no glyphs
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}
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// f.setTypeface(r.typeface); // r.typeface is always null (for now)
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f.setSize(r.size);
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f.setEmbolden(s.bold);
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f.setSkewX(s.italic ? -0.2 : 0);
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p.setColor(s.color ? s.color : [0,0,0,1]);
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let gly = r.glyphs;
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let pos = r.positions;
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if (start > r.textRange.start || end < r.textRange.end) {
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// search for the subset of glyphs to draw
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let glyph_start, glyph_end;
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for (let i = 0; i < r.offsets.length; ++i) {
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if (r.offsets[i] >= start) {
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glyph_start = i;
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break;
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}
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}
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for (let i = glyph_start+1; i < r.offsets.length; ++i) {
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if (r.offsets[i] >= end) {
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glyph_end = i;
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break;
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}
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}
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LOG(' glyph subrange', glyph_start, glyph_end);
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gly = gly.slice(glyph_start, glyph_end);
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// +2 at the end so we can see the trailing position (esp. for underlines)
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pos = pos.slice(glyph_start*2, glyph_end*2 + 2);
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} else {
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LOG(' use entire glyph run');
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}
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canvas.drawGlyphs(gly, pos, 0, 0, f, p);
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if (s.underline) {
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const gap = 2;
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const Y = pos[1]; // first Y
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const lastX = pos[gly.length*2];
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const sects = f.getGlyphIntercepts(gly, pos, Y+2, Y+4);
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let x = pos[0];
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for (let i = 0; i < sects.length; i += 2) {
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const end = sects[i] - gap;
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if (x < end) {
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canvas.drawRect([x, Y+2, end, Y+4], p);
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}
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x = sects[i+1] + gap;
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}
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if (x < lastX) {
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canvas.drawRect([x, Y+2, lastX, Y+4], p);
|
|
}
|
|
}
|
|
|
|
start = end;
|
|
}
|
|
|
|
this._cursor.draw_after(canvas);
|
|
canvas.restore();
|
|
},
|
|
|
|
// Styling
|
|
|
|
// returns [index, prev total length before this style]
|
|
find_style_index_and_prev_length: function(index) {
|
|
let len = 0;
|
|
for (let i = 0; i < this._styles.length; ++i) {
|
|
const l = this._styles[i]._length;
|
|
len += l;
|
|
// < favors the latter style if index is between two styles
|
|
if (index < len) {
|
|
return [i, len - l];
|
|
}
|
|
}
|
|
ASSERT(len === this._text.length);
|
|
return [this._styles.length-1, len];
|
|
},
|
|
_delete_style_range: function(start, end) {
|
|
// shrink/remove styles
|
|
//
|
|
// [.....][....][....][.....] styles
|
|
// [..................] start...end
|
|
//
|
|
// - trim the first style
|
|
// - remove the middle styles
|
|
// - trim the last style
|
|
|
|
let N = end - start;
|
|
let [i, prev_len] = this.find_style_index_and_prev_length(start);
|
|
let s = this._styles[i];
|
|
if (start > prev_len) {
|
|
// we overlap the first style (but not entirely
|
|
const skip = start - prev_len;
|
|
ASSERT(skip < s._length);
|
|
const shrink = Math.min(N, s._length - skip);
|
|
ASSERT(shrink > 0);
|
|
s._length -= shrink;
|
|
N -= shrink;
|
|
if (N === 0) {
|
|
return;
|
|
}
|
|
i += 1;
|
|
ASSERT(i < this._styles.length);
|
|
}
|
|
while (N > 0) {
|
|
s = this._styles[i];
|
|
if (N >= s._length) {
|
|
N -= s._length;
|
|
this._styles.splice(i, 1);
|
|
} else {
|
|
s._length -= N;
|
|
break;
|
|
}
|
|
}
|
|
},
|
|
|
|
applyStyleToRange: function(style, start, end) {
|
|
if (start > end) { [start, end] = [end, start]; }
|
|
ASSERT(start >= 0 && end <= this._text.length);
|
|
if (start === end) {
|
|
return;
|
|
}
|
|
|
|
LOG('trying to apply', style, start, end);
|
|
let i;
|
|
for (i = 0; i < this._styles.length; ++i) {
|
|
if (start <= this._styles[i]._length) {
|
|
break;
|
|
}
|
|
start -= this._styles[i]._length;
|
|
end -= this._styles[i]._length;
|
|
}
|
|
|
|
let s = this._styles[i];
|
|
// do we need to fission off a clean subset for the head of s?
|
|
if (start > 0) {
|
|
const ns = Object.assign({}, s);
|
|
s._length = start;
|
|
ns._length -= start;
|
|
LOG('initial splice', i, start, s._length, ns._length);
|
|
i += 1;
|
|
this._styles.splice(i, 0, ns);
|
|
end -= start;
|
|
// we don't use start any more
|
|
}
|
|
// merge into any/all whole styles we overlap
|
|
let layoutChanged = false;
|
|
while (end >= this._styles[i]._length) {
|
|
LOG('whole run merging for style index', i)
|
|
layoutChanged |= this._styles[i].mergeFrom(style);
|
|
end -= this._styles[i]._length;
|
|
i += 1;
|
|
if (end == 0) {
|
|
break;
|
|
}
|
|
}
|
|
// do we partially cover the last run
|
|
if (end > 0) {
|
|
s = this._styles[i];
|
|
const ns = Object.assign({}, s); // the new first half
|
|
ns._length = end;
|
|
s._length -= end; // trim the (unchanged) tail
|
|
LOG('merging tail', i, ns._length, s._length);
|
|
layoutChanged |= ns.mergeFrom(style);
|
|
this._styles.splice(i, 0, ns);
|
|
}
|
|
|
|
this._validateStyles();
|
|
LOG('after applying styles', this._styles);
|
|
|
|
if (layoutChanged) {
|
|
this._buildLines();
|
|
}
|
|
},
|
|
applyStyleToSelection: function(style) {
|
|
this.applyStyleToRange(style, this._index.start, this._index.end);
|
|
},
|
|
};
|
|
|
|
const s = MakeStyle(ed._text.length);
|
|
s.mergeFrom(style);
|
|
ed._styles = [ s ];
|
|
ed._buildLines();
|
|
return ed;
|
|
}
|