Unity Project

reference
https://cardgames.io/yahtzee/

Library/PackageCache/com.unity.timeline@1.2.15/Documentation~/crv_keys_sel.md

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+# Selecting keys
+
+Click to select a single key. Selecting a key deselects all other selected keys. The Curves view displays the selected key with its tangents. 
+
+![Click to select a single key. A selected key shows its tangents.](images/timeline_curves_view_select_key.png)
+
+_Click to select a single key. A selected key shows its tangents._
+
+To select contiguous keys along the same animation curve, click the first key, then hold Shift and click the last key.
+
+![Hold Shift and click a key to select contiguous keys](images/timeline_curves_view_select_contiguous.png)
+
+_Hold Shift and click a key to select contiguous keys_
+
+There are many ways to select and deselect keys in the Curves view:
+
+* Hold Command/Control and click to select discontiguous keys. Hold Command/Control and click a selected key to deselect it.
+* Click and drag on an empty spot in the Curves view to draw a selection rectangle. This selects all keys within the rectangle. Hold down Shift while drawing the selection rectangle to add keys to the current selection.
+* Double-click a selected key to select all keys on the same animation curve.
+