Trackpad fixes & changes:

- UV Image editor and other 2d views didn't zoom for CTRL+swipe yet.
  (2 finger trackpad, 1 finger mighty mouse)

- Switched defaults for 3D window swiping...
  - default rotate view
  - SHIFT for translate
  - CTRL for zooms

This makes all editors use 'swipe' like 'middle mouse', and not
like scrollwheel (as in releases).

This is nice for consistancy, but it still feels a bit weird...

Of course users can config this in keymaps. We need a sensible
default though, and to make a 2D input input device behave like
middle mouse seeems more sensible than like a 1D wheel...

Proposal therefore for defaults:

- 1D scrollwheels: zoom in 3d, zoom in 2d, but scroll for list views.

- 2D trackpads: pan for all 2d views, rotate for 3D

I'll check with frequent trackpad users about this and we can freeze it
before release. Give it a try :)

source/blender/editors/interface/view2d_ops.c

@@ -937,7 +937,7 @@ static int view_zoomdrag_invoke(bContext *C, wmOperator *op, wmEvent *event)
 	vzd = op->customdata;
 	v2d = vzd->v2d;
 	
-	if (event->type == MOUSEZOOM) {
+	if (event->type == MOUSEZOOM || event->type == MOUSEPAN) {
 		float dx, dy, fac;
 		
 		vzd->lastx = event->prevx;
@@ -948,6 +948,8 @@ static int view_zoomdrag_invoke(bContext *C, wmOperator *op, wmEvent *event)
 		 */
 		fac = 0.01f * (event->x - event->prevx);
 		dx = fac * BLI_rctf_size_x(&v2d->cur) / 10.0f;
+		if (event->type == MOUSEPAN)
+			fac = 0.01f * (event->y - event->prevy);
 		dy = fac * BLI_rctf_size_y(&v2d->cur) / 10.0f;
 
 		RNA_float_set(op->ptr, "deltax", dx);
@@ -1903,6 +1905,7 @@ void UI_view2d_keymap(wmKeyConfig *keyconf)
 	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom_in", WHEELINMOUSE, KM_PRESS, 0, 0);
 	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom_out", PADMINUS, KM_PRESS, 0, 0);
 	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom_in", PADPLUSKEY, KM_PRESS, 0, 0);
+	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom", MOUSEPAN, 0, KM_CTRL, 0);
 	
 	WM_keymap_verify_item(keymap, "VIEW2D_OT_smoothview", TIMER1, KM_ANY, KM_ANY, 0);
 
@@ -1951,6 +1954,7 @@ void UI_view2d_keymap(wmKeyConfig *keyconf)
 	
 	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom", MIDDLEMOUSE, KM_PRESS, KM_CTRL, 0);
 	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom", MOUSEZOOM, 0, 0, 0);
+	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom", MOUSEPAN, 0, KM_CTRL, 0);
 	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom_out", PADMINUS, KM_PRESS, 0, 0);
 	WM_keymap_add_item(keymap, "VIEW2D_OT_zoom_in", PADPLUSKEY, KM_PRESS, 0, 0);
 	WM_keymap_add_item(keymap, "VIEW2D_OT_reset", HOMEKEY, KM_PRESS, 0, 0);

source/blender/editors/space_image/image_ops.c

@@ -457,7 +457,7 @@ enum {
 
 static int image_view_zoom_invoke(bContext *C, wmOperator *op, wmEvent *event)
 {
-	if (event->type == MOUSEZOOM) {
+	if (event->type == MOUSEZOOM || event->type == MOUSEPAN) {
 		SpaceImage *sima = CTX_wm_space_image(C);
 		ARegion *ar = CTX_wm_region(C);
 		float delta, factor, location[2];

source/blender/editors/space_image/space_image.c

@@ -292,6 +292,7 @@ static void image_keymap(struct wmKeyConfig *keyconf)
 	WM_keymap_add_item(keymap, "IMAGE_OT_view_zoom_out", PADMINUS, KM_PRESS, 0, 0);
 	WM_keymap_add_item(keymap, "IMAGE_OT_view_zoom", MIDDLEMOUSE, KM_PRESS, KM_CTRL, 0);
 	WM_keymap_add_item(keymap, "IMAGE_OT_view_zoom", MOUSEZOOM, 0, 0, 0);
+	WM_keymap_add_item(keymap, "IMAGE_OT_view_zoom", MOUSEPAN, 0, KM_CTRL, 0);
 
 	/* ctrl now works as well, shift + numpad works as arrow keys on Windows */
 	RNA_float_set(WM_keymap_add_item(keymap, "IMAGE_OT_view_zoom_ratio", PAD8, KM_PRESS, KM_CTRL, 0)->ptr, "ratio", 8.0f);

source/blender/editors/space_view3d/view3d_ops.c

@@ -250,9 +250,9 @@ void view3d_keymap(wmKeyConfig *keyconf)
 
 	WM_keymap_verify_item(keymap, "VIEW3D_OT_smoothview", TIMER1, KM_ANY, KM_ANY, 0);
 	
-	WM_keymap_add_item(keymap, "VIEW3D_OT_rotate", MOUSEPAN, 0, KM_ALT, 0);
+	WM_keymap_add_item(keymap, "VIEW3D_OT_rotate", MOUSEPAN, 0, 0, 0);
 	WM_keymap_add_item(keymap, "VIEW3D_OT_rotate", MOUSEROTATE, 0, 0, 0);
-	WM_keymap_add_item(keymap, "VIEW3D_OT_move", MOUSEPAN, 0, 0, 0);
+	WM_keymap_add_item(keymap, "VIEW3D_OT_move", MOUSEPAN, 0, KM_SHIFT, 0);
 	WM_keymap_add_item(keymap, "VIEW3D_OT_zoom", MOUSEZOOM, 0, 0, 0);
 	WM_keymap_add_item(keymap, "VIEW3D_OT_zoom", MOUSEPAN, 0, KM_CTRL, 0);