svghmi/widget_scrollbar.ysl2
author GP Orcullo <kinsamanka@gmail.com>
Fri, 28 Oct 2022 17:26:50 +0800
branchpython3
changeset 3761 479ba844ded8
parent 3325 3930916a2e0d
permissions -rw-r--r--
xmlclass.py: fix AttributeError
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// widget_scrollbar.ysl2
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widget_desc("ScrollBar") {
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    longdesc
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    || 
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    ScrollBar - svg:rect based scrollbar
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    ||
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    shortdesc > ScrollBar
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    path name="value" accepts="HMI_INT" > value
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    path name="range" accepts="HMI_INT" > range
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    path name="visible" accepts="HMI_INT" > visible
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}
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widget_class("ScrollBar") {
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    ||
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        frequency = 10;
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        position = undefined;
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        range = undefined;
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        size = undefined;
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        mincursize = 0.1;
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        dispatch(value,oldval, index) {
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            switch(index) {
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                case 0:
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                    this.range = Math.max(1,value);
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                    break;
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                case 1:
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                    this.position = value;
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                    break;
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                case 2:
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                    this.size = value;
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                    break;
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            }
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            this.request_animate();
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        }
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        get_ratios() {
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            let range = this.range;
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            let size = Math.max(range * this.mincursize, Math.min(this.size, range));
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            let maxh = this.range_elt.height.baseVal.value;
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            let pixels = maxh;
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            return [size, maxh, range, pixels];
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        }
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        animate(){
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            if(this.position == undefined || this.range == undefined || this.size == undefined)
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                return;
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            let [size, maxh, range, pixels] = this.get_ratios();
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            let new_y = this.range_elt.y.baseVal.value + Math.round(Math.min(this.position,range-size) * pixels / range);
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            let new_height = Math.round(maxh * size/range);
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            this.cursor_elt.y.baseVal.value = new_y;
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            this.cursor_elt.height.baseVal.value = new_height;
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        }
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        init_mandatory() {
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            this.cursor_elt.onpointerdown = () => this.on_cursor_down();
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            this.bound_drag = this.drag.bind(this);
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            this.bound_drop = this.drop.bind(this);
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        }
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        apply_position(position){
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            this.position = Math.round(Math.max(Math.min(position, this.range - this.size), 0));
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            this.apply_hmi_value(1, this.position);
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        }
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        on_page_click(is_up){
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            this.apply_position(is_up ? this.position-this.size
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                                      : this.position+this.size);
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        }
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        on_cursor_down(e){
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            // get scrollbar -> root transform
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            let ctm = this.range_elt.getCTM();
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            // relative motion -> discard translation
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            ctm.e = 0;
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            ctm.f = 0;
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            // root -> scrollbar transform
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            this.invctm = ctm.inverse();
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            svg_root.addEventListener("pointerup", this.bound_drop, true);
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            svg_root.addEventListener("pointermove", this.bound_drag, true);
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            this.dragpos = this.position;
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        }
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        drop(e) {
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            svg_root.removeEventListener("pointerup", this.bound_drop, true);
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            svg_root.removeEventListener("pointermove", this.bound_drag, true);
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        }
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        drag(e) {
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            let [size, maxh, range, pixels] = this.get_ratios();
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            if(pixels == 0) return;
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            let point = new DOMPoint(e.movementX, e.movementY);
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            let movement = point.matrixTransform(this.invctm).y;
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            this.dragpos += movement * range / pixels;
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            this.apply_position(this.dragpos);
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        }
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    ||
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}
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widget_defs("ScrollBar") {
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    labels("cursor range");
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    const "pagebuttons" optional_labels("pageup pagedown");
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    const "have_pagebuttons","string-length($pagebuttons)>0";
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    value "$pagebuttons";
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    |     init: function() {
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    |         this.init_mandatory();
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    if "$have_pagebuttons" {
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    |         this.pageup_elt.onclick = () => this.on_page_click(true);
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    |         this.pagedown_elt.onclick = () => this.on_page_click(false);
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    }
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    |     },
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}