[andy/viking.git] / doc / dev / Track-Tool-Interfaces

static struct trwlayer_interface = {
 ...,
 trwlayer_tools,
 sizeof ( trwlayer_tools ) / sizeof ( LayerTool ), /* gshort */
};

static struct trwlayer_tools = {
  { "Add Waypoint", trwlayer_add_wp },
  { "Add Track", trwlayer_add_track },
};

----

Tools Adding:
ItemFactory args:
1) VikWindow
2) 4-byte variable containing ID and ID of tool.

struct VikLayerToolId {
  gshort layer_id;
  gshort tool_id;
};

Then we just need to assert (or #warning, etc.) that 
sizeof(VikLayerToolId) <= sizeof(gpointer)
OR, I could use guint8 to be on the safe size, for a maximum of 256 
layer types. But I think guint16 will be file.
Commit	Line	Data
50a14534 EB	1	static struct trwlayer_interface = {
	2	...,
	3	trwlayer_tools,
	4	sizeof ( trwlayer_tools ) / sizeof ( LayerTool ), /* gshort */
	5	};
	6
	7	static struct trwlayer_tools = {
	8	{ "Add Waypoint", trwlayer_add_wp },
	9	{ "Add Track", trwlayer_add_track },
	10	};
	11
	12	----
	13
	14	Tools Adding:
	15	ItemFactory args:
	16	1) VikWindow
	17	2) 4-byte variable containing ID and ID of tool.
	18
	19	struct VikLayerToolId {
	20	gshort layer_id;
	21	gshort tool_id;
	22	};
	23
	24	Then we just need to assert (or #warning, etc.) that
	25	sizeof(VikLayerToolId) <= sizeof(gpointer)
	26	OR, I could use guint8 to be on the safe size, for a maximum of 256
	27	layer types. But I think guint16 will be file.