1

// widget_dropdown.ysl2

     2

     3

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

     4

    param "hmi_element";

     5

    labels("text box button");

     6

||    

     7

    dispatch: function(value) {

     8

        if(!this.opened) this.set_selection(value);

     9

    },

    10

    init: function() {

    11

        this.button_elt.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_button_click()");

    12

        this.text_bbox = this.text_elt.getBBox()

    13

        this.box_bbox = this.box_elt.getBBox()

    14

        lmargin = this.text_bbox.x - this.box_bbox.x;

    15

        tmargin = this.text_bbox.y - this.box_bbox.y;

    16

        this.margins = [lmargin, tmargin].map(x => Math.max(x,0));

    17

        this.content = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten",

    18

                        "eleven", "twelve", "thirteen", "fourteen", "fifteen"];

    19

        //this.content = ["one", "two", "three", "four", "5", "6"];

    20

        this.menu_offset = 0;

    21

        this.lift = 0;

    22

        this.opened = false;

    24

    },

    25

    on_selection_click: function(selection) {

    26

        console.log("selected "+selection);

    27

        this.close();

    28

        this.set_selection(selection);

    29

    },

    30

    on_button_click: function() {

    31

        this.open();

    32

    },

    33

    on_backward_click:function(){

    34

        this.move(false);

    35

    },

    36

    on_forward_click:function(){

    37

        this.move(true);

    38

    },

    39

    set_selection: function(value) {

    40

        this.text_elt.firstElementChild.textContent = 

    41

          (value >= 0 && value < this.content.length) ?

    42

            this.content[value] : "?"+String(value)+"?";

    43

    },

    44

    grow_text: function(up_to) {

    45

        let count = 1;

    46

        let txt = this.text_elt; 

    47

        let first = txt.firstElementChild;

    48

        let bounds = svg_root.getBoundingClientRect(); 

    49

        this.lift = 0;

    50

        while(count < up_to) {

    51

            let next = first.cloneNode();

    52

            next.removeAttribute("y");

    53

            next.setAttribute("dy", "1.1em");

    54

            next.textContent = "...";

    55

            txt.appendChild(next);

    56

            let rect = txt.getBoundingClientRect();

    57

            if(rect.bottom > bounds.bottom){

    58

                let backup = first.getAttribute("dy");

    59

                first.setAttribute("dy", "-"+String((this.lift+1)*1.1)+"em");

    60

                rect = txt.getBoundingClientRect();

    61

                if(rect.top > bounds.top){

    62

                    this.lift += 1;

    63

                } else {

    64

                    if(backup)

    65

                        first.setAttribute("dy", backup);

    66

                    else

    67

                        first.removeAttribute("dy");

    68

                    txt.removeChild(next);

    69

                    return count;

    70

                }

    71

            }

    72

            count++;

    73

        }

    74

        return count;

    75

    },

    82

    close: function(){

    83

        this.reset_text();

    84

        this.reset_box();

    85

        this.element.appendChild(this.button_elt);

    87

        this.opened = false;

    88

    },

    89

    set_complete_text: function(){

    90

        let spans = this.text_elt.children; 

    91

        let c = 0;

    92

        for(let item of this.content){

    93

            let span=spans[c];

    94

            span.textContent = item;

    95

            span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_selection_click("+c+")");

    96

            c++;

    97

        }

    98

    },

    99

    move: function(forward){

   100

        let contentlength = this.content.length;

   101

        let spans = this.text_elt.children; 

   102

        let spanslength = spans.length;

   103

        if(this.menu_offset != 0) spanslength--;

   104

        if(this.menu_offset < contentlength - 1) spanslength--;

   105

        if(forward){

   106

            this.menu_offset = Math.min(

   107

                contentlength - spans.length + 1, 

   108

                this.menu_offset + spanslength);

   109

        }else{

   110

            this.menu_offset = Math.max(

   111

                0, 

   112

                this.menu_offset - spanslength);

   113

        }

   114

        console.log(this.menu_offset);

   115

        this.set_partial_text();

   116

    },

   117

    set_partial_text: function(){

   118

        let spans = this.text_elt.children; 

   119

        let contentlength = this.content.length;

   120

        let spanslength = spans.length;

   121

        let i = this.menu_offset, c = 0;

   122

        while(c < spanslength){

   123

            let span=spans[c];

   124

            if(c == 0 && i != 0){

   125

                span.textContent = "↑  ↑  ↑";

   126

                span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_backward_click()");

   127

            }else if(c == spanslength-1 && i < contentlength - 1){

   128

                span.textContent = "↓  ↓  ↓";

   129

                span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_forward_click()");

   130

            }else{

   131

                span.textContent = this.content[i];

   132

                span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_selection_click("+i+")");

   133

                i++;

   134

            }

   135

            c++;

   136

        }

   137

    },

   138

    open: function(){

   139

        let length = this.content.length;

   140

        this.reset_text();

   141

        let slots = this.grow_text(length);

   142

        if(slots == length) {

   143

            this.set_complete_text();

   144

        } else {

   145

            this.set_partial_text();

   146

        }

   147

        this.adjust_box_to_text();

   148

        this.element.removeChild(this.button_elt);

   151

        this.opened = true;

   152

    },

   153

    reset_text: function(){

   154

        let txt = this.text_elt; 

   155

        let first = txt.firstElementChild;

   156

        first.removeAttribute("onclick");

   157

        first.removeAttribute("dy");

   158

        for(let span of Array.from(txt.children).slice(1)){

   159

            txt.removeChild(span)

   160

        }

   161

    },

   162

    reset_box: function(){

   163

        let m = this.box_bbox;

   164

        let b = this.box_elt;

   165

        b.x.baseVal.value = m.x;

   166

        b.y.baseVal.value = m.y;

   167

        b.width.baseVal.value = m.width;

   168

        b.height.baseVal.value = m.height;

   169

    },

   170

    adjust_box_to_text: function(){

   171

        let [lmargin, tmargin] = this.margins;

   172

        let m = this.text_elt.getBBox();

   173

        let b = this.box_elt;

   174

        b.x.baseVal.value = m.x - lmargin;

   175

        b.y.baseVal.value = m.y - tmargin;

   176

        b.width.baseVal.value = 2 * lmargin + m.width;

   177

        b.height.baseVal.value = 2 * tmargin + m.height;

   178

    },

   179

||

   180

}

   181

   182

    // |         let p = new DOMPoint(this.box_elt.x.baseVal.value, this.box_elt.y.baseVal.value);

   183

    // |         let k = DOMMatrix.fromMatrix(this.box_elt.getCTM());

   184

    // |         let new_corner = k.transformPoint(p);

   185

    // |         new_corner.y = 0;

   186

    // |         let nc = k.inverse().transformPoint(new_corner);

   187

    // |         this.box_elt.x.baseVal.value = nc.x;

   188

    // |         this.box_elt.y.baseVal.value = nc.y;