RUNTIME: Variable trace now uses limited list and buffer instead of flags in instance tree that was requiring systematical instance tree traversal, and worst size buffer. Forcing and retain still use tree traversal.
// widget_scrollbar.ysl2
widget_desc("ScrollBar") {
longdesc
||
ScrollBar - svg:rect based scrollbar
||
shortdesc > ScrollBar
path name="value" accepts="HMI_INT" > value
path name="range" accepts="HMI_INT" > range
path name="visible" accepts="HMI_INT" > visible
}
widget_class("ScrollBar") {
||
frequency = 10;
position = undefined;
range = undefined;
size = undefined;
mincursize = 0.1;
dispatch(value,oldval, index) {
switch(index) {
case 0:
this.range = Math.max(1,value);
break;
case 1:
this.position = value;
break;
case 2:
this.size = value;
break;
}
this.request_animate();
}
get_ratios() {
let range = this.range;
let size = Math.max(range * this.mincursize, Math.min(this.size, range));
let maxh = this.range_elt.height.baseVal.value;
let pixels = maxh;
return [size, maxh, range, pixels];
}
animate(){
if(this.position == undefined || this.range == undefined || this.size == undefined)
return;
let [size, maxh, range, pixels] = this.get_ratios();
let new_y = this.range_elt.y.baseVal.value + Math.round(Math.min(this.position,range-size) * pixels / range);
let new_height = Math.round(maxh * size/range);
this.cursor_elt.y.baseVal.value = new_y;
this.cursor_elt.height.baseVal.value = new_height;
}
init_mandatory() {
this.cursor_elt.onpointerdown = () => this.on_cursor_down();
this.bound_drag = this.drag.bind(this);
this.bound_drop = this.drop.bind(this);
}
apply_position(position){
this.position = Math.round(Math.max(Math.min(position, this.range - this.size), 0));
this.apply_hmi_value(1, this.position);
}
on_page_click(is_up){
this.apply_position(is_up ? this.position-this.size
: this.position+this.size);
}
on_cursor_down(e){
// get scrollbar -> root transform
let ctm = this.range_elt.getCTM();
// relative motion -> discard translation
ctm.e = 0;
ctm.f = 0;
// root -> scrollbar transform
this.invctm = ctm.inverse();
svg_root.addEventListener("pointerup", this.bound_drop, true);
svg_root.addEventListener("pointermove", this.bound_drag, true);
this.dragpos = this.position;
}
drop(e) {
svg_root.removeEventListener("pointerup", this.bound_drop, true);
svg_root.removeEventListener("pointermove", this.bound_drag, true);
}
drag(e) {
let [size, maxh, range, pixels] = this.get_ratios();
if(pixels == 0) return;
let point = new DOMPoint(e.movementX, e.movementY);
let movement = point.matrixTransform(this.invctm).y;
this.dragpos += movement * range / pixels;
this.apply_position(this.dragpos);
}
||
}
widget_defs("ScrollBar") {
labels("cursor range");
const "pagebuttons" optional_labels("pageup pagedown");
const "have_pagebuttons","string-length($pagebuttons)>0";
value "$pagebuttons";
| init: function() {
| this.init_mandatory();
if "$have_pagebuttons" {
| this.pageup_elt.onclick = () => this.on_page_click(true);
| this.pagedown_elt.onclick = () => this.on_page_click(false);
}
| },
}