Add keyboard shortcuts to flick the events list

TODO.md

@@ -12,12 +12,14 @@
   - When qml syntax highlighting supports string interpolation, use them
 
 - Fixes
+  - Don't strip user spacing in html
   - Past events loading (limit 100) freezes the GUI - need to move upsert func
     to a WorkerScript
   - `MessageDelegate.qml:63: TypeError: 'reloadPreviousItem' not a function`
   - Horrible performance for big rooms
 
 - UI
+  - Adapt shortcuts flicking speed to font size and DPI
   - Show error box if uploading avatar fails
   - EditAccount page:
     - Device settings

src/qml/Chat/Timeline/EventList.qml

@@ -14,6 +14,7 @@ HRectangle {
     HListView {
         id: eventList
         clip: true
+        Component.onCompleted: shortcuts.flickTarget = eventList
 
         function canCombine(item, itemAfter) {
             if (! item || ! itemAfter) { return false }

src/qml/Shortcuts.qml

@@ -0,0 +1,37 @@
+// Copyright 2019 miruka
+// This file is part of harmonyqml, licensed under LGPLv3.
+
+import QtQuick 2.12
+
+Item {
+    property Item flickTarget: Item {}
+
+    function smartVerticalFlick(baseVelocity, fastMultiply=3) {
+        let vel = flickTarget.verticalVelocity
+
+        if (flickTarget.verticalLayoutDirection == ListView.BottomToTop) {
+            baseVelocity = -baseVelocity
+            vel          = -vel
+        }
+
+        let fast = (baseVelocity < 0 && vel < baseVelocity / 2) ||
+                   (baseVelocity > 0 && vel > baseVelocity / 2)
+
+        flickTarget.flick(0, baseVelocity * (fast ? fastMultiply : 1))
+    }
+
+    Shortcut {
+        sequences: ["Alt+Up", "Alt+K"]
+        onActivated: smartVerticalFlick(-335)
+    }
+
+    Shortcut {
+        sequences: ["Alt+Down", "Alt+J"]
+        onActivated: smartVerticalFlick(335)
+    }
+
+    Shortcut {
+        sequence: "Alt+Shift+D"
+        onActivated: if (window.debug) { py.call("APP.pdb") }
+    }
+}

src/qml/UI.qml

@@ -98,7 +98,5 @@ Item {
             popExit: null
             pushExit: null
         }
-
-        Keys.onEscapePressed: if (window.debug) { py.call("APP.pdb") }
     }
 }

src/qml/Window.qml

@@ -32,7 +32,7 @@ ApplicationWindow {
     onSettingsChanged: py.saveSettings()
 
     Theme     { id: theme }
-
+    Shortcuts { id: shortcuts}
     Python    { id: py }
 
     // Models