added optional checkbox for opacity, similar to color input

src/components/opacity_input/opacity_input.vue

@@ -18,7 +18,7 @@
       @input="$emit('input', !present ? fallback : undefined)"
     >
     <label
-      v-if="typeof fallback !== 'undefined'"
+      v-if="typeof fallback !== 'undefined' && showOptionalTickbox"
       class="opt-l"
       :for="name + '-o'"
     />
@@ -38,9 +38,38 @@
 
 <script>
 export default {
-  props: [
-    'name', 'value', 'fallback', 'disabled'
-  ],
+  props: {
+    // Name of opacity, used for identifying
+    name: {
+      required: true,
+      type: String
+    },
+    // Opacity value, should be required but vue cannot tell the difference
+    // between "property missing" and "property set to undefined"
+    value: {
+      required: false,
+      type: Number,
+      default: undefined
+    },
+    // Opacity fallback to use when value is not defeind
+    fallback: {
+      required: false,
+      type: Number,
+      default: undefined
+    },
+    // Disable the control
+    disabled: {
+      required: false,
+      type: Boolean,
+      default: false
+    },
+    // Show "optional" tickbox, for when value might become mandatory
+    showOptionalTickbox: {
+      required: false,
+      type: Boolean,
+      default: true
+    }
+  },
   computed: {
     present () {
       return typeof this.value !== 'undefined'

src/components/style_switcher/style_switcher.vue

@@ -118,15 +118,15 @@
               v-model="accentColorLocal"
               name="accentColor"
               :fallback="previewTheme.colors.link"
-              :showOptionalTickbox="typeof linkColorLocal !== 'undefined'"
               :label="$t('settings.accent')"
+              :showOptionalTickbox="typeof linkColorLocal !== 'undefined'"
             />
             <ColorInput
               v-model="linkColorLocal"
               name="linkColor"
               :fallback="previewTheme.colors.accent"
-              :showOptionalTickbox="typeof accentColorLocal !== 'undefined'"
               :label="$t('settings.links')"
+              :showOptionalTickbox="typeof accentColorLocal !== 'undefined'"
             />
             <ContrastRatio :contrast="previewContrast.bgLink" />
           </div>
@@ -239,6 +239,7 @@
               v-model="panelOpacityLocal"
               name="panelOpacity"
               :fallback="previewTheme.opacity.panel"
+              :showOptionalTickbox="panelColorLocal !== 'transparent'"
             />
             <ColorInput
               v-model="panelTextColorLocal"
@@ -296,6 +297,7 @@
               v-model="inputOpacityLocal"
               name="inputOpacity"
               :fallback="previewTheme.opacity.input"
+              :showOptionalTickbox="inputColorLocal !== 'transparent'"
             />
             <ColorInput
               v-model="inputTextColorLocal"
@@ -317,6 +319,7 @@
               v-model="btnOpacityLocal"
               name="btnOpacity"
               :fallback="previewTheme.opacity.btn"
+              :showOptionalTickbox="btnColorLocal !== 'transparent'"
             />
             <ColorInput
               v-model="btnTextColorLocal"
@@ -338,6 +341,7 @@
               v-model="borderOpacityLocal"
               name="borderOpacity"
               :fallback="previewTheme.opacity.border"
+              :showOptionalTickbox="borderColorLocal !== 'transparent'"
             />
           </div>
           <div class="color-item">
@@ -378,6 +382,7 @@
               v-model="underlayOpacityLocal"
               name="underlayOpacity"
               :fallback="previewTheme.opacity.underlay"
+              :showOptionalTickbox="underlayOpacityLocal !== 'transparent'"
             />
           </div>
         </div>