1

// widget_scrollbar.ysl2

     2

     3

template "widget[@type='ScrollBar']", mode="widget_class"{

     4

    ||

     5

    class ScrollBarWidget extends Widget{

     7

        position = undefined;

     8

        range = undefined;

     9

        size = undefined;

    10

        mincursize = 0.1;

    11

    12

        dispatch(value,oldval, index) {

    13

            switch(index) {

    14

                case 0:

    15

                    if (Math.round(this.position) != value)

    16

                        this.position = value;

    17

                    break;

    18

                case 1:

    19

                    this.range = value;

    20

                    break;

    21

                case 2:

    22

                    this.size = value;

    23

                    break;

    24

            }

    25

    26

            this.request_animate();

    27

        }

    28

    29

        get_ratios() {

    30

            let range = this.range;

    31

            let size = Math.max(this.range * this.mincursize, Math.min(this.size, range));

    32

            let maxh = this.range_elt.height.baseVal.value;

    33

            let pixels = (range - size) * maxh;

    34

            let units = range*range;

    35

            return [size, maxh, range, pixels, units];

    36

        }

    37

    38

        animate(){

    39

            if(this.position == undefined || this.range == undefined || this.size == undefined)

    40

                return;

    41

            let [size, maxh, range, pixels, units] = this.get_ratios();

    42

    43

            let new_y = this.range_elt.y.baseVal.value + Math.round(Math.min(this.position,range) * pixels / units);

    44

            let new_height = Math.round(maxh * size/range);

    45

    46

            this.cursor_elt.y.baseVal.value = new_y;

    47

            this.cursor_elt.height.baseVal.value = new_height;

    48

        }

    49

    50

        init_mandatory() {

    51

            this.cursor_elt.onpointerdown = () => this.on_cursor_down();

    52

    53

            this.bound_drag = this.drag.bind(this);

    54

            this.bound_drop = this.drop.bind(this);

    55

        }

    56

    57

        apply_position(position){

    58

            this.position = Math.max(Math.min(position, this.range), 0);

    59

            this.apply_hmi_value(0, Math.round(this.position));

    60

        }

    61

    62

        on_page_click(is_up){

    63

            this.apply_position(is_up ? this.position-this.size

    64

                                      : this.position+this.size);

    65

        }

    66

    67

        on_cursor_down(e){

    68

            // get scrollbar -> root transform

    69

            let ctm = this.range_elt.getCTM();

    70

            // relative motion -> discard translation

    71

            ctm.e = 0;

    72

            ctm.f = 0;

    73

            // root -> scrollbar transform

    74

            this.invctm = ctm.inverse();

    75

            svg_root.addEventListener("pointerup", this.bound_drop, true);

    76

            svg_root.addEventListener("pointermove", this.bound_drag, true);

    77

        }

    78

    79

        drop(e) {

    80

            svg_root.removeEventListener("pointerup", this.bound_drop, true);

    81

            svg_root.removeEventListener("pointermove", this.bound_drag, true);

    82

        }

    83

    84

        drag(e) {

    85

            let [size, maxh, range, pixels, units] = this.get_ratios();

    86

            if(pixels == 0) return;

    87

            let point = new DOMPoint(e.movementX, e.movementY);

    88

            let movement = point.matrixTransform(this.invctm).y;

    89

            this.apply_position(this.position + movement * units / pixels);

    90

        }

    91

    }

    92

    ||

    93

}

    94

    95

template "widget[@type='ScrollBar']", mode="widget_defs" {

    96

    param "hmi_element";

    97

    labels("cursor range");

    98

    99

    const "pagebuttons" optional_labels("pageup pagedown");

   100

    const "have_pagebuttons","string-length($pagebuttons)>0";

   101

    value "$pagebuttons";

   102

   103

    |     init: function() {

   104

    |         this.init_mandatory();

   105

   106

    if "$have_pagebuttons" {

   107

    |         this.pageup_elt.onclick = () => this.on_page_click(true);

   108

    |         this.pagedown_elt.onclick = () => this.on_page_click(false);

   109

    }

   110

    |     },

   111

}