Handle soft keyboard better

package-lock.json

@@ -20,6 +20,7 @@
         "roboto-fontface": "*",
         "v-emoji-picker": "^2.3.1",
         "vue": "^2.6.11",
+        "vue-resize": "^0.5.0",
         "vue-router": "^3.2.0",
         "vuetify": "^2.2.11",
         "vuex": "^3.5.1"
@@ -13499,6 +13500,14 @@
         "vue-class-component": "*"
       }
     },
+    "node_modules/vue-resize": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/vue-resize/-/vue-resize-0.5.0.tgz",
+      "integrity": "sha512-k5gOOwTIGSoWZb133Gx3IfSeiiAmve5GyWI7+pU8CvbNntpSAlrCYwZ26GB63NpxcLPK94+m0BDl5TxuZUI+Hw==",
+      "peerDependencies": {
+        "vue": "^2.6.11"
+      }
+    },
     "node_modules/vue-router": {
       "version": "3.4.9",
       "resolved": "https://registry.npmjs.org/vue-router/-/vue-router-3.4.9.tgz",
@@ -25652,6 +25661,12 @@
       "integrity": "sha512-xYA8MkZynPBGd/w5QFJ2d/NM0z/YeegMqYTphy7NJQXbZcuU6FC6AOdUAcy4SXP+YnkerC6AfH+ldg7PDk9ESQ==",
       "requires": {}
     },
+    "vue-resize": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/vue-resize/-/vue-resize-0.5.0.tgz",
+      "integrity": "sha512-k5gOOwTIGSoWZb133Gx3IfSeiiAmve5GyWI7+pU8CvbNntpSAlrCYwZ26GB63NpxcLPK94+m0BDl5TxuZUI+Hw==",
+      "requires": {}
+    },
     "vue-router": {
       "version": "3.4.9",
       "resolved": "https://registry.npmjs.org/vue-router/-/vue-router-3.4.9.tgz",

package.json

@@ -21,6 +21,7 @@
     "roboto-fontface": "*",
     "v-emoji-picker": "^2.3.1",
     "vue": "^2.6.11",
+    "vue-resize": "^0.5.0",
     "vue-router": "^3.2.0",
     "vuetify": "^2.2.11",
     "vuex": "^3.5.1"

src/components/Chat.vue

@@ -7,9 +7,18 @@
       v-on:sscroll="onScroll"
     >
       <div v-for="event in events" :key="event.getId()">
-        <div v-if="!event.isRelation() && !event.isRedacted() && !event.isRedaction()">
+        <div
-          <div style="position:relative;user-select:none"
+          v-if="
-          v-on:touchstart="(e) => { touchStart(e, event) }" 
+            !event.isRelation() && !event.isRedacted() && !event.isRedaction()
+          "
+        >
+          <div
+            style="position: relative; user-select: none"
+            v-on:touchstart="
+              (e) => {
+                touchStart(e, event);
+              }
+            "
             v-on:touchend="touchEnd"
             v-on:touchcancel="touchCancel"
             v-on:touchmove="touchMove"
@@ -37,6 +46,12 @@
           </div>
         </div>
       </div>
+
+      <!-- Handle resizes, e.g. when soft keyboard is shown/hidden -->
+      <resize-observer
+        ref="chatContainerResizer"
+        @notify="handleChatContainerResize"
+      />
     </div>
 
     <!-- Input area -->
@@ -196,7 +211,13 @@ export default {
       currentSendError: null,
       showEmojiPicker: false,
       selectedEvent: null,
-      showContextMenu: false
+      showContextMenu: false,
+      /**
+       * Current chat container size. We need to keep track of this so that if and when
+       * a soft keyboard is shown/hidden we can restore the scroll position correctly.
+       * If we don't, the keyboard will simply overflow the message we are answering to etc.
+       */
+      chatContainerSize: 0,
     };
   },
 
@@ -205,6 +226,8 @@ export default {
     this.scrollPosition = new ScrollPosition(container);
     this.$matrix.on("Room.timeline", this.onEvent);
     this.$matrix.on("RoomMember.typing", this.onUserTyping);
+    this.chatContainerSize = this.$refs.chatContainerResizer.$el.clientHeight;
+    console.log("resize initial height: ", this.chatContainerSize);
   },
 
   destroyed() {
@@ -258,13 +281,13 @@ export default {
 
   methods: {
     touchX(event) {
-      if(event.type.indexOf('mouse') !== -1){
+      if (event.type.indexOf("mouse") !== -1) {
         return event.clientX;
       }
       return event.touches[0].clientX;
     },
     touchY(event) {
-      if(event.type.indexOf('mouse') !== -1){
+      if (event.type.indexOf("mouse") !== -1) {
         return event.clientY;
       }
       return event.touches[0].clientY;
@@ -291,17 +314,38 @@ export default {
       this.touchCurrentX = this.touchX(e);
       this.touchCurrentY = this.touchY(e);
       var tapTolerance = 4;
-      var touchMoved = Math.abs(this.touchStartX - this.touchCurrentX) > tapTolerance ||
+      var touchMoved =
+        Math.abs(this.touchStartX - this.touchCurrentX) > tapTolerance ||
         Math.abs(this.touchStartY - this.touchCurrentY) > tapTolerance;
       if (touchMoved) {
         this.touchTimer && clearTimeout(this.touchTimer);
       }
     },
+
+    /**
+     * Triggered when out "long tap" timer hits.
+     */
     touchTimerElapsed() {
-      console.log('timer');
       this.showContextMenu = true;
     },
 
+    /**
+     * If chat container is shrunk (probably because soft keyboard is shown) adjust
+     * the scroll position so that e.g. if we were looking at the last message when
+     * moving focus to the input field, we would still see the last message. Otherwise
+     * if would be hidden behind the keyboard.
+     */
+    handleChatContainerResize({ width, height }) {
+      console.log("resized", width, height);
+      const delta = height - this.chatContainerSize;
+      this.chatContainerSize = height;
+      console.log("resized delta " + delta);
+      const container = this.$refs.chatContainer;
+      if (delta < 0) {
+        container.scrollTop -= delta;
+      }
+    },
+
     componentForEvent(event) {
       switch (event.getType()) {
         case "m.room.member":
@@ -372,7 +416,7 @@ export default {
 
       // If we are at bottom, scroll to see new events...
       const container = this.$refs.chatContainer;
-      var scrollToSeeNew = (event.getSender() == this.$matrix.currentUserId); // When we sent, scroll
+      var scrollToSeeNew = event.getSender() == this.$matrix.currentUserId; // When we sent, scroll
       if (
         container.scrollHeight - container.scrollTop.toFixed(0) ==
         container.clientHeight
@@ -560,7 +604,7 @@ export default {
         .catch((err) => {
           console.log("Failed to send quick reaction:", err);
         });
-    }
+    },
   },
 };
 </script>

src/main.js

@@ -7,9 +7,12 @@ import matrix from './services/matrix.service'
 import 'roboto-fontface/css/roboto/roboto-fontface.css'
 import 'material-design-icons-iconfont/dist/material-design-icons.css'
 import VEmojiPicker from 'v-emoji-picker';
+import VueResize from 'vue-resize';
+import 'vue-resize/dist/vue-resize.css';
 
 Vue.config.productionTip = false
 
+Vue.use(VueResize);
 Vue.use(VEmojiPicker);
 Vue.use(matrix, {store: store});