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https://github.com/lutris/lutris
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Instead of animating a certain amount on each call to animate(), we'll measure the time since the animation started - that should be stabler.
This also means I do not need to use nonlocal, since we don't keep mutable state in captured variables. Hope that makes this code clearer.
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@ -1,3 +1,4 @@
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import time
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from typing import List
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from gi.repository import Gdk, Gio, GLib, GObject
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@ -119,24 +120,31 @@ class GameView:
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raise NotImplementedError
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def on_game_start(self, game):
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fraction = 0
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delta = 0.05
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limit = 0.1
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"""On game start, we trigger an animation to show the game is starting; it runs at least
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one cycle, but continues until the game exits the STATE_LAUNCHING state."""
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# We animate by looking at how long the animation has been running;
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# This keeps things on track even if drawing is low or the timeout we use
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# is not quite regular.
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start_time = time.monotonic()
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cycle_time = 0.375
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max_indent = 0.1
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def animate():
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nonlocal fraction, delta, limit
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elapsed = time.monotonic() - start_time
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cycle = elapsed % cycle_time
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# After 1/2 the cycle, start counting down instead of up
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if cycle > cycle_time / 2:
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cycle = cycle_time - cycle
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# scale to achieve the max_indent at cycle_time/2.
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fraction = max_indent * (cycle * 2 / cycle_time)
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self.queue_draw()
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fraction += delta
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if fraction > limit:
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fraction = limit
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delta = -0.0125
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elif fraction <= 0.0:
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if game.state == game.STATE_LAUNCHING:
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fraction = 0.0
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delta = 0.0125
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else:
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if elapsed >= cycle_time:
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if game.state != game.STATE_LAUNCHING:
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self.image_renderer.inset_game(game.id, 0.0)
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return False
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@ -115,6 +115,14 @@ class GridViewCellRendererImage(Gtk.CellRenderer):
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self._inset_fractions = {}
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def inset_game(self, game_id, fraction):
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"""This function indicates that a particular game should be displayed inset by a certain fraction of
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its total size; 0 is full size, 0.1 would show it at 90% size, but centered.
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This is not bound as an attribute; it's used for an ephemeral animation, and we wouldn't want
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to mess with the GameStore to do it. Instead, the cell renderer tracks these per game ID, and
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the caller uses queue_draw() to trigger a redraw.
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Set the fraction to 0 for a game to remove the effect when done."""
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if fraction > 0.0:
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self._inset_fractions[game_id] = fraction
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else:
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