wasp: launcher: Experimental launcher implementation

It is not really the launcher itself that is immature. Rather that the
framework and UI concepts to move between applications isn't complete
yet.

1 files changed, 80 insertions, 0 deletions

diff --git a/wasp/apps/launcher.py b/wasp/apps/launcher.py
new file mode 100644
index 0000000..274ea9c
--- /dev/null
+++ b/wasp/apps/launcher.py
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: LGPL-3.0-or-later
+# Copyright (C) 2020 Daniel Thompson
+
+import wasp
+import icons
+
+class LauncherApp():
+    """An application launcher application.
+    """
+    NAME = 'Launcher'
+    ICON = icons.app
+
+    def foreground(self):
+        """Activate the application."""
+        self._page = 0
+        self._draw()
+        wasp.system.request_event(wasp.EventMask.TOUCH |
+                                  wasp.EventMask.SWIPE_UPDOWN)
+
+    def swipe(self, event):
+        i = self._page
+        n = self._num_pages
+        if event[0] == wasp.EventType.UP:
+            i += 1
+            if i >= n:
+                i -= 1
+                wasp.watch.vibrator.pulse()
+                return
+        else:
+            i -= 1
+            if i < 0:
+                wasp.system.switch(wasp.system.applications[0])
+                return
+
+        self._page = i
+        wasp.watch.display.mute(True)
+        self._draw()
+        wasp.watch.display.mute(False)
+
+    def touch(self, event):
+        page = self._get_page(self._page)
+        x = event[1]
+        y = event[2]
+        app = page[2 * (y // 120) + (x // 120)]
+        if app:
+            wasp.system.switch(app)
+        else:
+            wasp.watch.vibrator.pulse()
+
+    @property
+    def _num_pages(self):
+        """Work out what the highest possible pages it."""
+        num_apps = len(wasp.system.applications)
+        return (num_apps + 3) // 4
+
+    def _get_page(self, i):
+        apps = wasp.system.applications
+        page = apps[4*i: 4*(i+1)]
+        while len(page) < 4:
+            page.append(None)
+        return page
+
+    def _draw(self):
+        """Redraw the display from scratch."""
+        def draw_app(app, x, y):
+            if not app:
+                return
+            draw.set_color(0xffff)
+            draw.rleblit(app.ICON, (x+13, y+12))
+            draw.set_color(0xbdb6)
+            draw.string(app.NAME, x, y+120-30, 120)
+
+        draw = wasp.watch.drawable
+        page = self._get_page(self._page)
+        
+        draw.fill()
+        draw_app(page[0],   0,   0)
+        draw_app(page[1], 120,   0)
+        draw_app(page[2],   0, 120)
+        draw_app(page[3], 120, 120)