Custom spinners that use step for increment, but enforce multipleOf

webapp/src/components/labThingsComponents/inputFromSchema.vue

@@ -5,7 +5,7 @@
       <div class="input-and-buttons-container">
         <select
           v-model="internalValue"
-          class="uk-form-small numeric-setting-line-input dropdown"
+          class="uk-form-small property-input dropdown"
           @change="sendValue"
         >
           <option v-for="(value, display) in options" :key="value" :value="value">
@@ -18,26 +18,32 @@
     <label v-if="!useDropdown && dataType == 'number'" class="uk-form-label"
       >{{ label }}
       <div class="input-and-buttons-container">
+        <div class="uk-inline number-wrapper">
           <input
             ref="numericalInput"
             v-model="internalValue"
-          class="uk-form-small numeric-setting-line-input"
+            class="uk-form-small property-input numeric-property"
             :class="{ edited: isEdited, flash: animateUpdate }"
             :disabled="isDisabled"
             type="number"
             :min="minimum"
             :max="maximum"
-          :step="spinner_step"
+            @wheel="handleSpiner"
             @input="grabFocus"
             @focusout="focusOut"
             @keydown="keyDown"
             @animationend="animationEnd"
           />
+          <div class="spinner-buttons">
+            <button type="button" @click="increment(1)" @mousedown="spinnerClick">▲</button>
+            <button type="button" @click="increment(-1)" @mousedown="spinnerClick">▼</button>
+          </div>
+        </div>
         <sync-property-button @click="requestUpdate" />
       </div>
     </label>
     <div v-if="!useDropdown && dataType == 'boolean'" class="input-and-buttons-container">
-      <label class="uk-form-label numeric-setting-line-input">
+      <label class="uk-form-label property-input">
         <input
           ref="checkbox"
           v-model="internalValue"
@@ -57,7 +63,7 @@
           v-for="i in valueLength"
           :key="i"
           v-model="internalValue[i - 1]"
-          class="uk-form-small numeric-setting-line-input"
+          class="uk-form-small property-input"
           :class="{ edited: isEdited, flash: animateUpdate }"
           :disabled="isDisabled"
           type="number"
@@ -76,7 +82,7 @@
         <div class="input-and-buttons-container">
           <input
             v-model="internalValue[key]"
-            class="uk-form-small numeric-setting-line-input"
+            class="uk-form-small property-input"
             :class="{ edited: isEdited, flash: animateUpdate }"
             :disabled="isDisabled"
             type="number"
@@ -94,7 +100,7 @@
       <div class="input-and-buttons-container">
         <input
           v-model="internalValue"
-          class="uk-form-small numeric-setting-line-input"
+          class="uk-form-small property-input"
           :class="{ edited: isEdited, flash: animateUpdate }"
           :disabled="isDisabled"
           type="text"
@@ -110,7 +116,7 @@
       <div class="input-and-buttons-container">
         <input
           v-model="internalValue"
-          class="uk-form-small numeric-setting-line-input"
+          class="uk-form-small property-input"
           type="text"
           disabled="true"
         />
@@ -321,6 +327,37 @@ export default {
         this.sendValue();
       }
     },
+    increment(sign) {
+      const step = this.spinner_step || 1;
+      const multipleOf = this.dataSchema.multipleOf;
+      let newValue = Number(this.internalValue) || 0;
+      newValue += sign * step;
+      // Apply minimum if defined
+      if (this.minimum !== undefined && this.minimum !== null) {
+        newValue = Math.max(newValue, this.minimum);
+      }
+      // Apply maximum if defined
+      if (this.maximum !== undefined && this.maximum !== null) {
+        newValue = Math.min(newValue, this.maximum);
+      }
+
+      // If mulipleOf is validated on server then enforce it.
+      if (multipleOf) {
+        newValue = Math.round(newValue / multipleOf) * multipleOf;
+      }
+
+      // Rounding to about 5 sig figs to stop weird javascript rounding.
+      const magnitude = Math.floor(Math.log10(Math.abs(newValue)));
+      const factor = 10 ** -(Math.floor(magnitude) - 4);
+      this.internalValue = Math.round(newValue * factor) / factor;
+    },
+    /**
+     * Grab focus for the numerical input when a spinner is clicked.
+     */
+    spinnerClick(event) {
+      event.preventDefault();
+      this.$refs.numericalInput.focus();
+    },
     /** Grab the browser focus.
      *
      * This is needed for numerical elements to be in focus when a spinner
@@ -378,12 +415,50 @@ export default {
   align-items: center;
   width: 100%;
 }
-.numeric-setting-line-input {
+.property-input {
   flex-grow: 1;
   margin-left: 5px;
   margin-right: 5px;
   width: 6em;
 }
+/*Hide standard spinners as it isn't possible to customise the browser ones.*/
+.numeric-property {
+  -moz-appearance: textfield;
+}
+.numeric-property::-webkit-outer-spin-button,
+.numeric-property::-webkit-inner-spin-button {
+  -webkit-appearance: none;
+}
+
+.number-wrapper {
+  display: flex;
+  flex-flow: row wrap;
+  justify-content: flex-start;
+  align-content: stretch;
+  align-items: center;
+  flex-grow: 1;
+}
+
+.spinner-buttons {
+  position: absolute;
+  right: 4px;
+  top: 1px;
+  bottom: 5px;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+}
+
+.spinner-buttons button {
+  height: 45%;
+  padding: 0 6px;
+  line-height: 1;
+  font-size: 10px;
+  border: none;
+  background: transparent;
+  cursor: pointer;
+  color: #888;
+}
 .dropdown {
   background-color: #fff;
   border: 1px solid #ccc;