Add size request to BuddyActivityView and use it in IconLayout

shell/view/home/IconLayout.py

@@ -1,11 +1,14 @@
 import random
 import math
 
+import cairo
+
 class IconLayout:
 	DISTANCE_THRESHOLD = 120.0
 
 	def __init__(self, grid):
 		self._icons = []
+		self._constraints = {}
 		self._grid = grid
 
 		[self._x1, self._y1] = self._grid.convert_to_canvas(1, 1)
@@ -17,12 +20,26 @@ class IconLayout:
 
 	def remove_icon(self, icon):
 		self._icons.remove(icon)
+		del self._constraints[icon]
+
+	def _get_distance(self, icon1, icon2):
+		[icon1_x, icon1_y] = self._constraints[icon1]
+		[icon2_x, icon2_y] = self._constraints[icon2]
+
+		a = icon1_x - icon2_x
+		b = icon1_y - icon2_y
 
-	def _distance(self, icon1, icon2):
-		a = icon2.props.x - icon1.props.x
-		b = icon2.props.y - icon1.props.y
 		return math.sqrt(a * a  + b * b)
 
+	def _get_repulsion(self, icon1, icon2):
+		[icon1_x, icon1_y] = self._constraints[icon1]
+		[icon2_x, icon2_y] = self._constraints[icon2]
+
+		f_x = icon1_x - icon2_x
+		f_y = icon1_y - icon2_y
+
+		return [f_x, f_y]
+
 	def _spread_icons(self):
 		self._stable = True
 
@@ -30,32 +47,39 @@ class IconLayout:
 			vx = 0
 			vy = 0
 
+			[x, y] = self._constraints[icon1]
+
 			for icon2 in self._icons:
 				if icon1 != icon2:
-					distance = self._distance(icon1, icon2)
+					distance = self._get_distance(icon1, icon2)
 					if distance <= IconLayout.DISTANCE_THRESHOLD:
 						self._stable = False
-						vx += icon1.props.x - icon2.props.x
-						vy += icon1.props.y - icon2.props.y
+						[f_x, f_y] = self._get_repulsion(icon1, icon2)
+						vx += f_x
+						vy += f_y
 
-			new_x = icon1.props.x + vx
-			new_y = icon1.props.y + vy
+			new_x = x + vx
+			new_y = y + vy
 
 			new_x = max(self._x1, new_x)
 			new_y = max(self._y1, new_y)
 
-			new_x = min(self._x2 - icon1.props.size, new_x)
-			new_y = min(self._y2 - icon1.props.size, new_y)
+			[width, height] = icon1.get_size_request()
+			new_x = min(self._x2 - width, new_x)
+			new_y = min(self._y2 - height, new_y)
 
-			icon1.props.x = new_x
-			icon1.props.y = new_y
+			self._constraints[icon1] = [new_x, new_y]
+
+			matrix = cairo.Matrix(1, 0, 0, 1, 0, 0)
+			matrix.translate(new_x, new_y)
+			icon1.set_transform(matrix)
 
 	def _layout_icon(self, icon):
-		x = random.random() * (self._x2 - self._x1 - icon.props.size) 
-		y = random.random() * (self._y2 - self._y1 - icon.props.size)
+		[width, height] = icon.get_size_request()
+		x = random.random() * (self._x2 - self._x1 - width) 
+		y = random.random() * (self._y2 - self._y1 - height)
 
-		icon.props.x = x + self._x1
-		icon.props.y = y + self._y1
+		self._constraints[icon] = [x, y]
 
 		tries = 10
 		self._spread_icons()