Add drag detection threshold to date picker.

Prototype touch drag on database screen.

1 files changed, 6 insertions, 1 deletions

diff --git a/date_picker/value_picker.gd b/date_picker/value_picker.gd
index 5e77294..fcd7dff 100644
--- a/date_picker/value_picker.gd
+++ b/date_picker/value_picker.gd
@@ -5,6 +5,7 @@ class_name ValuePicker
 const VELOCITY_DECAYING_FACTOR: float = 5.5
 const BINNING_THRESHOLD: float = 0.75
 const BINNING_ADJUST_P: float = 5.0
+const DRAG_THRESHOLD_CM: float = 0.250
 
 export var min_value: int
 export var max_value: int
@@ -19,6 +20,7 @@ var anchor: float
 var value: int
 var offset: float
 
+var screen_dpcm: float
 var scroll_unit_height: float
 var label_previous_base_position: float
 var label_current_base_position: float
@@ -39,6 +41,7 @@ func _ready():
 	input.connect("focus_entered", self, "input_focus_entered")
 	input.connect("focus_exited", self, "input_focus_exited")
 	
+	screen_dpcm = float(OS.get_screen_dpi()) / 2.54
 	scroll_unit_height =  label_current.rect_size.y
 	label_previous_base_position = label_previous.rect_position.y
 	label_current_base_position = label_current.rect_position.y
@@ -105,7 +108,8 @@ func _gui_input(event: InputEvent):
 		var drag := event as InputEventScreenDrag
 		pointer.current_position = drag.position
 		pointer.velocity = drag.speed
-		pointer.was_dragged = true
+		if pointer.current_position.distance_to(pointer.initial_position) / screen_dpcm > DRAG_THRESHOLD_CM:
+			pointer.was_dragged = true
 
 
 func input_text_entered(new_text: String):
@@ -113,6 +117,7 @@ func input_text_entered(new_text: String):
 
 
 func input_focus_entered():
+	pointer.velocity = Vector2.ZERO # Avoid changing to other value once entering input.
 	input.text = "%d" % value
 	input.visible = true
 	input.select_all()