Catch pageup/down and ctrl-home/end at the top level

Make the scroll keys work when the focus is outside the message panel.

src/components/structures/MatrixChat.js

@@ -35,6 +35,7 @@ var Tinter = require("../../Tinter");
 var sdk = require('../../index');
 var MatrixTools = require('../../MatrixTools');
 var linkifyMatrix = require("../../linkify-matrix");
+var KeyCode = require('../../KeyCode');
 
 module.exports = React.createClass({
     displayName: 'MatrixChat',
@@ -722,11 +723,10 @@ module.exports = React.createClass({
     },
 
     onKeyDown: function(ev) {
-        if (ev.altKey) {
             /*
             // Remove this for now as ctrl+alt = alt-gr so this breaks keyboards which rely on alt-gr for numbers
             // Will need to find a better meta key if anyone actually cares about using this.
-            if (ev.ctrlKey && ev.keyCode > 48 && ev.keyCode < 58) {
+            if (ev.altKey && ev.ctrlKey && ev.keyCode > 48 && ev.keyCode < 58) {
                 dis.dispatch({
                     action: 'view_indexed_room',
                     roomIndex: ev.keyCode - 49,
@@ -736,18 +736,45 @@ module.exports = React.createClass({
                 return;
             }
             */
-            switch (ev.keyCode) {
-                case 38:
-                    dis.dispatch({action: 'view_prev_room'});
-                    ev.stopPropagation();
-                    ev.preventDefault();
-                    break;
-                case 40:
-                    dis.dispatch({action: 'view_next_room'});
-                    ev.stopPropagation();
-                    ev.preventDefault();
-                    break;
-            }
+
+        var handled = false;
+
+        switch (ev.keyCode) {
+            case KeyCode.UP:
+            case KeyCode.DOWN:
+                if (ev.altKey) {
+                    var action = ev.keyCode == KeyCode.UP ?
+                        'view_prev_room' : 'view_next_room';
+                    dis.dispatch({action: action});
+                    handled = true;
+                }
+                break;
+
+            case KeyCode.PAGE_UP:
+            case KeyCode.PAGE_DOWN:
+                this._onScrollKeyPressed(ev);
+                handled = true;
+                break;
+
+            case KeyCode.HOME:
+            case KeyCode.END:
+                if (ev.ctrlKey) {
+                    this._onScrollKeyPressed(ev);
+                    handled = true;
+                }
+                break;
+        }
+
+        if (handled) {
+            ev.stopPropagation();
+            ev.preventDefault();
+        }
+    },
+
+    /** dispatch a page-up/page-down/etc to the appropriate component */
+    _onScrollKeyPressed(ev) {
+        if (this.refs.roomView) {
+            this.refs.roomView.handleScrollKey(ev);
         }
     },
 

src/components/structures/MessagePanel.js

@@ -132,6 +132,14 @@ module.exports = React.createClass({
         }
     },
 
+    /* jump to the top of the content.
+     */
+    scrollToTop: function() {
+        if (this.refs.scrollPanel) {
+            this.refs.scrollPanel.scrollToTop();
+        }
+    },
+
     /* jump to the bottom of the content.
      */
     scrollToBottom: function() {
@@ -139,6 +147,26 @@ module.exports = React.createClass({
             this.refs.scrollPanel.scrollToBottom();
         }
     },
+    
+    /**
+     * Page up/down.
+     *
+     * mult: -1 to page up, +1 to page down
+     */
+    scrollRelative: function(mult) {
+        if (this.refs.scrollPanel) {
+            this.refs.scrollPanel.scrollRelative(mult);
+        }
+    },
+
+    /**
+     * Scroll up/down in response to a scroll key
+     */
+    handleScrollKey: function(ev) {
+        if (this.refs.scrollPanel) {
+            this.refs.handleScrollKey(ev);
+        }
+    },
 
     /* jump to the given event id.
      *

src/components/structures/RoomView.js

@@ -1115,6 +1115,24 @@ module.exports = React.createClass({
         }
     },
 
+    /**
+     * called by the parent component when PageUp/Down/etc is pressed.
+     *
+     * We pass it down to the scroll panel.
+     */
+    handleScrollKey: function(ev) {
+        var panel;
+        if(this.refs.searchResultsPanel) {
+            panel = this.refs.searchResultsPanel;
+        } else if(this.refs.messagePanel) {
+            panel = this.refs.messagePanel;
+        }
+
+        if(panel) {
+            panel.handleScrollKey(ev);
+        }
+    },
+
     // this has to be a proper method rather than an unnamed function,
     // otherwise react calls it with null on each update.
     _gatherTimelinePanelRef: function(r) {

src/components/structures/ScrollPanel.js

@@ -18,6 +18,7 @@ var React = require("react");
 var ReactDOM = require("react-dom");
 var GeminiScrollbar = require('react-gemini-scrollbar');
 var q = require("q");
+var KeyCode = require('../../KeyCode');
 
 var DEBUG_SCROLL = false;
 // var DEBUG_SCROLL = true;
@@ -326,6 +327,17 @@ module.exports = React.createClass({
         this.scrollState = {stuckAtBottom: true};
     },
 
+    /**
+     * jump to the top of the content.
+     */
+    scrollToTop: function() {
+        this._setScrollTop(0);
+        this._saveScrollState();
+    },
+
+    /**
+     * jump to the bottom of the content.
+     */
     scrollToBottom: function() {
         // the easiest way to make sure that the scroll state is correctly
         // saved is to do the scroll, then save the updated state. (Calculating
@@ -335,6 +347,45 @@ module.exports = React.createClass({
         this._saveScrollState();
     },
 
+    /**
+     * Page up/down.
+     *
+     * mult: -1 to page up, +1 to page down
+     */
+    scrollRelative: function(mult) {
+        var scrollNode = this._getScrollNode();
+        var delta = mult * scrollNode.clientHeight * 0.5;
+        this._setScrollTop(scrollNode.scrollTop + delta);
+        this._saveScrollState();
+    },
+
+    /**
+     * Scroll up/down in response to a scroll key
+     */
+    handleScrollKey: function(ev) {
+        switch (ev.keyCode) {
+            case KeyCode.PAGE_UP:
+                this.scrollRelative(-1);
+                break;
+
+            case KeyCode.PAGE_DOWN:
+                this.scrollRelative(1);
+                break;
+
+            case KeyCode.HOME:
+                if (ev.ctrlKey) {
+                    this.scrollToTop();
+                }
+                break;
+
+            case KeyCode.END:
+                if (ev.ctrlKey) {
+                    this.scrollToBottom();
+                }
+                break;
+        }
+    },
+
     /* Scroll the panel to bring the DOM node with the scroll token
      * `scrollToken` into view.
      *

src/components/structures/TimelinePanel.js

@@ -27,6 +27,7 @@ var dis = require("../../dispatcher");
 var ObjectUtils = require('../../ObjectUtils');
 var Modal = require("../../Modal");
 var UserActivity = require("../../UserActivity");
+var KeyCode = require('../../KeyCode');
 
 var PAGINATE_SIZE = 20;
 var INITIAL_SIZE = 20;
@@ -520,6 +521,23 @@ var TimelinePanel = React.createClass({
         return null;
     },
 
+    /**
+     * called by the parent component when PageUp/Down/etc is pressed.
+     *
+     * We pass it down to the scroll panel.
+     */
+    handleScrollKey: function(ev) {
+        if (!this.refs.messagePanel) { return; }
+
+        // jump to the live timeline on ctrl-end, rather than the end of the
+        // timeline window.
+        if (ev.ctrlKey && ev.keyCode == KeyCode.END) {
+            this.jumpToLiveTimeline();
+        } else {
+            this.refs.messagePanel.handleScrollKey(ev);
+        }
+    },
+
     _initTimeline: function(props) {
         var initialEvent = props.eventId;
         var pixelOffset = props.eventPixelOffset;