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.

4 files changed, 91 insertions, 0 deletions

diff --git a/wasp/apps/clock.py b/wasp/apps/clock.py
index 4feba63..4236d9a 100644
--- a/wasp/apps/clock.py
+++ b/wasp/apps/clock.py
@@ -3,6 +3,7 @@
 
 import wasp
 
+import icons
 import fonts.clock as digits
 
 DIGITS = (
@@ -25,6 +26,8 @@ class ClockApp():
 
     Shows a time (as HH:MM) together with a battery meter and the date.
     """
+    NAME = 'Clock'
+    ICON = icons.clock
 
     def __init__(self):
         self.meter = wasp.widgets.BatteryMeter()
diff --git a/wasp/apps/flashlight.py b/wasp/apps/flashlight.py
index 13e3443..c4702a0 100644
--- a/wasp/apps/flashlight.py
+++ b/wasp/apps/flashlight.py
@@ -3,11 +3,15 @@
 
 import wasp
 
+import icons
+
 class FlashlightApp(object):
     """Trivial flashlight application.
 
     Shows a pure white screen with the backlight set to maximum.
     """
+    NAME = 'Torch'
+    ICON = icons.torch
 
     def foreground(self):
         """Activate the application."""
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)
diff --git a/wasp/apps/testapp.py b/wasp/apps/testapp.py
index 8c15848..478249f 100644
--- a/wasp/apps/testapp.py
+++ b/wasp/apps/testapp.py
@@ -3,10 +3,13 @@
 
 import machine
 import wasp
+import icons
 
 class TestApp():
     """Simple test application.
     """
+    NAME = 'Self Test'
+    ICON = icons.app
 
     def __init__(self):
         self.tests = ('Touch', 'String', 'Button', 'Crash')
@@ -57,6 +60,7 @@ class TestApp():
     def benchmark_string(self):
         draw = wasp.watch.drawable
         draw.fill(0, 0, 30, 240, 240-30)
+        self.scroll.draw()
         t = machine.Timer(id=1, period=8000000)
         t.start()
         draw.string("The quick brown", 12, 24+24)