--- a/svghmi/widget_dropdown.ysl2 Thu Dec 10 15:48:15 2020 +0100
+++ b/svghmi/widget_dropdown.ysl2 Tue Dec 15 13:43:21 2020 +0100
@@ -1,252 +1,262 @@
// widget_dropdown.ysl2
+template "widget[@type='DropDown']", mode="widget_class"{
+||
+ class DropDownWidget extends Widget{
+ dispatch(value) {
+ if(!this.opened) this.set_selection(value);
+ }
+ init() {
+ this.button_elt.onclick = this.on_button_click.bind(this);
+ // Save original size of rectangle
+ this.box_bbox = this.box_elt.getBBox()
+
+ // Compute margins
+ let text_bbox = this.text_elt.getBBox();
+ let lmargin = text_bbox.x - this.box_bbox.x;
+ let tmargin = text_bbox.y - this.box_bbox.y;
+ this.margins = [lmargin, tmargin].map(x => Math.max(x,0));
+
+ // Index of first visible element in the menu, when opened
+ this.menu_offset = 0;
+
+ // How mutch to lift the menu vertically so that it does not cross bottom border
+ this.lift = 0;
+
+ // Event handlers cannot be object method ('this' is unknown)
+ // as a workaround, handler given to addEventListener is bound in advance.
+ this.bound_close_on_click_elsewhere = this.close_on_click_elsewhere.bind(this);
+ this.bound_on_selection_click = this.on_selection_click.bind(this);
+ this.bound_on_backward_click = this.on_backward_click.bind(this);
+ this.bound_on_forward_click = this.on_forward_click.bind(this);
+ this.opened = false;
+ }
+ on_button_click() {
+ this.open();
+ }
+ // Called when a menu entry is clicked
+ on_selection_click(selection) {
+ this.close();
+ this.apply_hmi_value(0, selection);
+ }
+ on_backward_click(){
+ this.scroll(false);
+ }
+ on_forward_click(){
+ this.scroll(true);
+ }
+ set_selection(value) {
+ let display_str;
+ if(value >= 0 && value < this.content.length){
+ // if valid selection resolve content
+ display_str = this.content[value];
+ this.last_selection = value;
+ } else {
+ // otherwise show problem
+ display_str = "?"+String(value)+"?";
+ }
+ // It is assumed that first span always stays,
+ // and contains selection when menu is closed
+ this.text_elt.firstElementChild.textContent = display_str;
+ }
+ grow_text(up_to) {
+ let count = 1;
+ let txt = this.text_elt;
+ let first = txt.firstElementChild;
+ // Real world (pixels) boundaries of current page
+ let bounds = svg_root.getBoundingClientRect();
+ this.lift = 0;
+ while(count < up_to) {
+ let next = first.cloneNode();
+ // relative line by line text flow instead of absolute y coordinate
+ next.removeAttribute("y");
+ next.setAttribute("dy", "1.1em");
+ // default content to allow computing text element bbox
+ next.textContent = "...";
+ // append new span to text element
+ txt.appendChild(next);
+ // now check if text extended by one row fits to page
+ // FIXME : exclude margins to be more accurate on box size
+ let rect = txt.getBoundingClientRect();
+ if(rect.bottom > bounds.bottom){
+ // in case of overflow at the bottom, lift up one row
+ let backup = first.getAttribute("dy");
+ // apply lift asr a dy added too first span (y attrib stays)
+ first.setAttribute("dy", "-"+String((this.lift+1)*1.1)+"em");
+ rect = txt.getBoundingClientRect();
+ if(rect.top > bounds.top){
+ this.lift += 1;
+ } else {
+ // if it goes over the top, then backtrack
+ // restore dy attribute on first span
+ if(backup)
+ first.setAttribute("dy", backup);
+ else
+ first.removeAttribute("dy");
+ // remove unwanted child
+ txt.removeChild(next);
+ return count;
+ }
+ }
+ count++;
+ }
+ return count;
+ }
+ close_on_click_elsewhere(e) {
+ // inhibit events not targetting spans (menu items)
+ if(e.target.parentNode !== this.text_elt){
+ e.stopPropagation();
+ // close menu in case click is outside box
+ if(e.target !== this.box_elt)
+ this.close();
+ }
+ }
+ close(){
+ // Stop hogging all click events
+ svg_root.removeEventListener("click", this.bound_close_on_click_elsewhere, true);
+ // Restore position and sixe of widget elements
+ this.reset_text();
+ this.reset_box();
+ // Put the button back in place
+ this.element.appendChild(this.button_elt);
+ // Mark as closed (to allow dispatch)
+ this.opened = false;
+ // Dispatch last cached value
+ this.apply_cache();
+ }
+ // Set text content when content is smaller than menu (no scrolling)
+ set_complete_text(){
+ let spans = this.text_elt.children;
+ let c = 0;
+ for(let item of this.content){
+ let span=spans[c];
+ span.textContent = item;
+ let sel = c;
+ span.onclick = (evt) => this.bound_on_selection_click(sel);
+ c++;
+ }
+ }
+ // Move partial view :
+ // false : upward, lower value
+ // true : downward, higher value
+ scroll(forward){
+ let contentlength = this.content.length;
+ let spans = this.text_elt.children;
+ let spanslength = spans.length;
+ // reduce accounted menu size according to jumps
+ if(this.menu_offset != 0) spanslength--;
+ if(this.menu_offset < contentlength - 1) spanslength--;
+ if(forward){
+ this.menu_offset = Math.min(
+ contentlength - spans.length + 1,
+ this.menu_offset + spanslength);
+ }else{
+ this.menu_offset = Math.max(
+ 0,
+ this.menu_offset - spanslength);
+ }
+ this.set_partial_text();
+ }
+ // Setup partial view text content
+ // with jumps at first and last entry when appropriate
+ set_partial_text(){
+ let spans = this.text_elt.children;
+ let contentlength = this.content.length;
+ let spanslength = spans.length;
+ let i = this.menu_offset, c = 0;
+ while(c < spanslength){
+ let span=spans[c];
+ // backward jump only present if not exactly at start
+ if(c == 0 && i != 0){
+ span.textContent = "↑ ↑ ↑";
+ span.onclick = this.bound_on_backward_click;
+ // presence of forward jump when not right at the end
+ }else if(c == spanslength-1 && i < contentlength - 1){
+ span.textContent = "↓ ↓ ↓";
+ span.onclick = this.bound_on_forward_click;
+ // otherwise normal content
+ }else{
+ span.textContent = this.content[i];
+ let sel = i;
+ span.onclick = (evt) => this.bound_on_selection_click(sel);
+ i++;
+ }
+ c++;
+ }
+ }
+ open(){
+ let length = this.content.length;
+ // systematically reset text, to strip eventual whitespace spans
+ this.reset_text();
+ // grow as much as needed or possible
+ let slots = this.grow_text(length);
+ // Depending on final size
+ if(slots == length) {
+ // show all at once
+ this.set_complete_text();
+ } else {
+ // eventualy align menu to current selection, compensating for lift
+ let offset = this.last_selection - this.lift;
+ if(offset > 0)
+ this.menu_offset = Math.min(offset + 1, length - slots + 1);
+ else
+ this.menu_offset = 0;
+ // show surrounding values
+ this.set_partial_text();
+ }
+ // Now that text size is known, we can set the box around it
+ this.adjust_box_to_text();
+ // Take button out until menu closed
+ this.element.removeChild(this.button_elt);
+ // Rise widget to top by moving it to last position among siblings
+ this.element.parentNode.appendChild(this.element.parentNode.removeChild(this.element));
+ // disable interaction with background
+ svg_root.addEventListener("click", this.bound_close_on_click_elsewhere, true);
+ // mark as open
+ this.opened = true;
+ }
+ // Put text element in normalized state
+ reset_text(){
+ let txt = this.text_elt;
+ let first = txt.firstElementChild;
+ // remove attribute eventually added to first text line while opening
+ first.removeAttribute("onclick");
+ first.removeAttribute("dy");
+ // keep only the first line of text
+ for(let span of Array.from(txt.children).slice(1)){
+ txt.removeChild(span)
+ }
+ }
+ // Put rectangle element in saved original state
+ reset_box(){
+ let m = this.box_bbox;
+ let b = this.box_elt;
+ b.x.baseVal.value = m.x;
+ b.y.baseVal.value = m.y;
+ b.width.baseVal.value = m.width;
+ b.height.baseVal.value = m.height;
+ }
+ // Use margin and text size to compute box size
+ adjust_box_to_text(){
+ let [lmargin, tmargin] = this.margins;
+ let m = this.text_elt.getBBox();
+ let b = this.box_elt;
+ b.x.baseVal.value = m.x - lmargin;
+ b.y.baseVal.value = m.y - tmargin;
+ b.width.baseVal.value = 2 * lmargin + m.width;
+ b.height.baseVal.value = 2 * tmargin + m.height;
+ }
+ }
+||
+}
template "widget[@type='DropDown']", mode="widget_defs" {
param "hmi_element";
labels("text box button");
||
- dispatch: function(value) {
- if(!this.opened) this.set_selection(value);
- },
- init: function() {
- this.button_elt.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_button_click()");
- // Save original size of rectangle
- this.box_bbox = this.box_elt.getBBox()
-
- // Compute margins
- text_bbox = this.text_elt.getBBox()
- lmargin = text_bbox.x - this.box_bbox.x;
- tmargin = text_bbox.y - this.box_bbox.y;
- this.margins = [lmargin, tmargin].map(x => Math.max(x,0));
-
- // It is assumed that list content conforms to Array interface.
- this.content = [
- ``foreach "arg" | "«@value»",
- ];
-
- // Index of first visible element in the menu, when opened
- this.menu_offset = 0;
-
- // How mutch to lift the menu vertically so that it does not cross bottom border
- this.lift = 0;
-
- // Event handlers cannot be object method ('this' is unknown)
- // as a workaround, handler given to addEventListener is bound in advance.
- this.bound_close_on_click_elsewhere = this.close_on_click_elsewhere.bind(this);
-
- this.opened = false;
- },
- // Called when a menu entry is clicked
- on_selection_click: function(selection) {
- this.close();
- this.apply_hmi_value(0, selection);
- },
- on_button_click: function() {
- this.open();
- },
- on_backward_click: function(){
- this.scroll(false);
- },
- on_forward_click:function(){
- this.scroll(true);
- },
- set_selection: function(value) {
- let display_str;
- if(value >= 0 && value < this.content.length){
- // if valid selection resolve content
- display_str = this.content[value];
- this.last_selection = value;
- } else {
- // otherwise show problem
- display_str = "?"+String(value)+"?";
- }
- // It is assumed that first span always stays,
- // and contains selection when menu is closed
- this.text_elt.firstElementChild.textContent = display_str;
- },
- grow_text: function(up_to) {
- let count = 1;
- let txt = this.text_elt;
- let first = txt.firstElementChild;
- // Real world (pixels) boundaries of current page
- let bounds = svg_root.getBoundingClientRect();
- this.lift = 0;
- while(count < up_to) {
- let next = first.cloneNode();
- // relative line by line text flow instead of absolute y coordinate
- next.removeAttribute("y");
- next.setAttribute("dy", "1.1em");
- // default content to allow computing text element bbox
- next.textContent = "...";
- // append new span to text element
- txt.appendChild(next);
- // now check if text extended by one row fits to page
- // FIXME : exclude margins to be more accurate on box size
- let rect = txt.getBoundingClientRect();
- if(rect.bottom > bounds.bottom){
- // in case of overflow at the bottom, lift up one row
- let backup = first.getAttribute("dy");
- // apply lift asr a dy added too first span (y attrib stays)
- first.setAttribute("dy", "-"+String((this.lift+1)*1.1)+"em");
- rect = txt.getBoundingClientRect();
- if(rect.top > bounds.top){
- this.lift += 1;
- } else {
- // if it goes over the top, then backtrack
- // restore dy attribute on first span
- if(backup)
- first.setAttribute("dy", backup);
- else
- first.removeAttribute("dy");
- // remove unwanted child
- txt.removeChild(next);
- return count;
- }
- }
- count++;
- }
- return count;
- },
- close_on_click_elsewhere: function(e) {
- // inhibit events not targetting spans (menu items)
- if(e.target.parentNode !== this.text_elt){
- e.stopPropagation();
- // close menu in case click is outside box
- if(e.target !== this.box_elt)
- this.close();
- }
- },
- close: function(){
- // Stop hogging all click events
- svg_root.removeEventListener("click", this.bound_close_on_click_elsewhere, true);
- // Restore position and sixe of widget elements
- this.reset_text();
- this.reset_box();
- // Put the button back in place
- this.element.appendChild(this.button_elt);
- // Mark as closed (to allow dispatch)
- this.opened = false;
- // Dispatch last cached value
- this.apply_cache();
- },
- // Set text content when content is smaller than menu (no scrolling)
- set_complete_text: function(){
- let spans = this.text_elt.children;
- let c = 0;
- for(let item of this.content){
- let span=spans[c];
- span.textContent = item;
- span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_selection_click("+c+")");
- c++;
- }
- },
- // Move partial view :
- // false : upward, lower value
- // true : downward, higher value
- scroll: function(forward){
- let contentlength = this.content.length;
- let spans = this.text_elt.children;
- let spanslength = spans.length;
- // reduce accounted menu size according to jumps
- if(this.menu_offset != 0) spanslength--;
- if(this.menu_offset < contentlength - 1) spanslength--;
- if(forward){
- this.menu_offset = Math.min(
- contentlength - spans.length + 1,
- this.menu_offset + spanslength);
- }else{
- this.menu_offset = Math.max(
- 0,
- this.menu_offset - spanslength);
- }
- this.set_partial_text();
- },
- // Setup partial view text content
- // with jumps at first and last entry when appropriate
- set_partial_text: function(){
- let spans = this.text_elt.children;
- let contentlength = this.content.length;
- let spanslength = spans.length;
- let i = this.menu_offset, c = 0;
- while(c < spanslength){
- let span=spans[c];
- // backward jump only present if not exactly at start
- if(c == 0 && i != 0){
- span.textContent = "↑ ↑ ↑";
- span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_backward_click()");
- // presence of forward jump when not right at the end
- }else if(c == spanslength-1 && i < contentlength - 1){
- span.textContent = "↓ ↓ ↓";
- span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_forward_click()");
- // otherwise normal content
- }else{
- span.textContent = this.content[i];
- span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_selection_click("+i+")");
- i++;
- }
- c++;
- }
- },
- open: function(){
- let length = this.content.length;
- // systematically reset text, to strip eventual whitespace spans
- this.reset_text();
- // grow as much as needed or possible
- let slots = this.grow_text(length);
- // Depending on final size
- if(slots == length) {
- // show all at once
- this.set_complete_text();
- } else {
- // eventualy align menu to current selection, compensating for lift
- let offset = this.last_selection - this.lift;
- if(offset > 0)
- this.menu_offset = Math.min(offset + 1, length - slots + 1);
- else
- this.menu_offset = 0;
- // show surrounding values
- this.set_partial_text();
- }
- // Now that text size is known, we can set the box around it
- this.adjust_box_to_text();
- // Take button out until menu closed
- this.element.removeChild(this.button_elt);
- // Rise widget to top by moving it to last position among siblings
- this.element.parentNode.appendChild(this.element.parentNode.removeChild(this.element));
- // disable interaction with background
- svg_root.addEventListener("click", this.bound_close_on_click_elsewhere, true);
- // mark as open
- this.opened = true;
- },
- // Put text element in normalized state
- reset_text: function(){
- let txt = this.text_elt;
- let first = txt.firstElementChild;
- // remove attribute eventually added to first text line while opening
- first.removeAttribute("onclick");
- first.removeAttribute("dy");
- // keep only the first line of text
- for(let span of Array.from(txt.children).slice(1)){
- txt.removeChild(span)
- }
- },
- // Put rectangle element in saved original state
- reset_box: function(){
- let m = this.box_bbox;
- let b = this.box_elt;
- b.x.baseVal.value = m.x;
- b.y.baseVal.value = m.y;
- b.width.baseVal.value = m.width;
- b.height.baseVal.value = m.height;
- },
- // Use margin and text size to compute box size
- adjust_box_to_text: function(){
- let [lmargin, tmargin] = this.margins;
- let m = this.text_elt.getBBox();
- let b = this.box_elt;
- b.x.baseVal.value = m.x - lmargin;
- b.y.baseVal.value = m.y - tmargin;
- b.width.baseVal.value = 2 * lmargin + m.width;
- b.height.baseVal.value = 2 * tmargin + m.height;
- },
+ // It is assumed that list content conforms to Array interface.
+ content: [
+ ``foreach "arg" | "«@value»",
+ ],
+
||
}