on.grabDown - Revision history

Adriweb: Link

2012-06-17T11:25:41Z

Link

2012-06-17T11:25:06Z

2012-06-17T11:24:25Z

2011-05-24T11:22:41Z

Created page with " Category:Events"

New page

[[Category:Events]]

@@ Line 32: / Line 32: @@
 end
 </source>
-You can see the whole lua example about Ball generation and movements here : [[Balls Example (Class + Events Handling)|Balls_Example]]
+You can see the whole lua example about Ball generation and movements here : [[Balls_Example|Balls Example (Class + Events Handling)]]
 == See Also ==

@@ Line 1: / Line 1: @@
+The event '''on.grabDown''' is used to handle grabbing motions (cursor press & hold).<br /><br />
 This routine is called in these situations:
 * When the user presses and holds the Select key on a device
 * When the user presses Ctrl + Select on a device
 * When the user presses the middle mouse button over an active card on the desktop

← Older revision		Revision as of 11:24, 17 June 2012
Line 1:		Line 1:

		+	The event '''on.grabDown''' is used to handle grabbing motions (cursor press & hold).<br />

		+	This routine is called in these situations:
		+
		+
		+	* When the user presses and holds the Select key on a device
		+	* When the user presses Ctrl + Select on a device
		+	* When the user presses the middle mouse button over an active card on the desktop
		+
		+
		+
		+	The passed coordinated, x and y, are always 0 and 0.
		+	The ''grabDown'' and [[on.grabUp\|''grabUp'']] events prevent the generation of a [[on.mouseUp\|''mouseUp'']] event in all cases.
		+
		+	They will be preceded by a [[on.mouseDown]] event when generated by pressing and holding the Select key on a device.
		+
		+
		+	== Example ==
		+	Below is an example of a program that handles the grabbing motion to move an object :
		+	<source lang="lua">function Ball:move(x,y)
		+	self.x = x
		+	self.y = y
		+	platform.window:invalidate()
		+	end
		+
		+	function on.grabDown(x,y)
		+	isGrabbing = not isGrabbing -- makes the variable switch from true to false and vice versa
		+	platform.window:invalidate()
		+	end
		+
		+	function on.mouseMove(x,y)
		+	if isGrabbing and (trackedBall and trackedBall.isActive) then -- assuming trackedBall is defined etc.
		+	trackedBall:move(x-trackedBall.r/2,y-trackedBall.r/2)
		+	end
		+	end
		+	</source>
		+	You can see the whole lua example about Ball generation and movements here : [[Balls Example (Class + Events Handling)\|Balls_Example]]
		+
		+	== See Also ==
		+	[[on.grabUp]]

	[[Category:Events]]		[[Category:Events]]