avr: added widget SensorWatch

shows a pictogram for a sensor and changes background color according to
values received from a given sensor.

avr/modules/lcd2/gui2/imageview.asm

@@ -28,6 +28,11 @@
 .equ IMGVIEW_SD_SIZE           = IMGVIEW_SD_OFFS_IMGVIEW+2
 
 
+; signals
+.equ IMGVIEW_SIGNAL_SETBGCOL       =  WIDGET_SIGNAL_NEXTFREE+0
+.equ IMGVIEW_SIGNAL_NEXTFREE       =  WIDGET_SIGNAL_NEXTFREE+1
+
+
 
 ; ***************************************************************************
 ; code
@@ -56,6 +61,34 @@ ImageView_OnCreate:
 
 
 
+; ---------------------------------------------------------------------------
+; @routine ImageView_OnSetBgCol @global
+;
+; @param Z byte address of widget object (for LPM!)
+; @param X new value for background color
+; @return CFLAG set if signal handled
+; @clobbers r17
+
+ImageView_OnSetBgCol:
+  bigcall OBJ_IsObject                   ; (none)
+  brcc ImageView_OnSetBgCol_ret
+  push zl
+    push zh
+      rcall Widget_GetSdramPtr           ; (none)
+      std Y+IMGVIEW_SD_OFFS_BGCOL_LO, xl
+      std Y+IMGVIEW_SD_OFFS_BGCOL_HI, xh
+      ldd r17, Y+WIDGET_SD_OFFS_FLAGS
+      ori r17, (1<<WIDGET_FLAGS_DIRTY_BIT)
+      std Y+WIDGET_SD_OFFS_FLAGS, r17
+    pop zh
+  pop zl
+ImageView_OnSetBgCol_ret:
+  sec
+  ret
+; @end
+
+
+
 ; ---------------------------------------------------------------------------
 ; @routine Widget_OnDraw @global
 ;