1 files changed, 30 insertions, 22 deletions

diff --git a/source/blender/editors/interface/interface_handlers.c b/source/blender/editors/interface/interface_handlers.c
index 12a6343c7e7..39aef38fadb 100644
--- a/source/blender/editors/interface/interface_handlers.c
+++ b/source/blender/editors/interface/interface_handlers.c
@@ -4158,20 +4158,27 @@ static int ui_do_but_COLORBAND(bContext *C, uiBlock *block, uiBut *but, uiHandle
 	return WM_UI_HANDLER_CONTINUE;
 }
 
-static int ui_numedit_but_CURVE(uiBut *but, uiHandleButtonData *data, int snap,
-                                float mx, float my, const short shift)
+static int ui_numedit_but_CURVE(uiBlock *block, uiBut *but, uiHandleButtonData *data, int snap,
+                                int evtx, int evty, const short shift)
 {
 	CurveMapping *cumap = (CurveMapping *)but->poin;
 	CurveMap *cuma = cumap->cm + cumap->cur;
 	CurveMapPoint *cmp = cuma->curve;
-	float fx, fy, zoomx, zoomy /*, offsx, offsy */ /* UNUSED */;
+	float fx, fy, zoomx, zoomy;
+	int mx, my, dragx, dragy;
 	int a, changed = 0;
 
+	/* evtx evty and drag coords are absolute mousecoords, prevents errors when editing when layout changes */
+	mx = evtx;
+	my = evty;
+	ui_window_to_block(data->region, block, &mx, &my);
+	dragx = data->draglastx;
+	dragy = data->draglasty;
+	ui_window_to_block(data->region, block, &dragx, &dragy);
+	
 	zoomx = BLI_rctf_size_x(&but->rect) / BLI_rctf_size_x(&cumap->curr);
 	zoomy = BLI_rctf_size_y(&but->rect) / BLI_rctf_size_y(&cumap->curr);
-	/* offsx = cumap->curr.xmin; */
-	/* offsy = cumap->curr.ymin; */
-
+	
 	if (snap) {
 		float d[2];
 
@@ -4187,8 +4194,8 @@ static int ui_numedit_but_CURVE(uiBut *but, uiHandleButtonData *data, int snap,
 		const float mval_factor = ui_mouse_scale_warp_factor(shift);
 		int moved_point = 0;     /* for ctrl grid, can't use orig coords because of sorting */
 
-		fx = (mx - data->draglastx) / zoomx;
-		fy = (my - data->draglasty) / zoomy;
+		fx = (mx - dragx) / zoomx;
+		fy = (my - dragy) / zoomy;
 
 		fx *= mval_factor;
 		fy *= mval_factor;
@@ -4212,8 +4219,8 @@ static int ui_numedit_but_CURVE(uiBut *but, uiHandleButtonData *data, int snap,
 		curvemapping_changed(cumap, FALSE);
 		
 		if (moved_point) {
-			data->draglastx = mx;
-			data->draglasty = my;
+			data->draglastx = evtx;
+			data->draglasty = evty;
 			changed = 1;
 
 #ifdef USE_CONT_MOUSE_CORRECT
@@ -4232,8 +4239,8 @@ static int ui_numedit_but_CURVE(uiBut *but, uiHandleButtonData *data, int snap,
 		data->dragchange = 1; /* mark for selection */
 	}
 	else {
-		fx = (mx - data->draglastx) / zoomx;
-		fy = (my - data->draglasty) / zoomy;
+		fx = (mx - dragx) / zoomx;
+		fy = (my - dragy) / zoomy;
 		
 		/* clamp for clip */
 		if (cumap->flag & CUMA_DO_CLIP) {
@@ -4252,8 +4259,8 @@ static int ui_numedit_but_CURVE(uiBut *but, uiHandleButtonData *data, int snap,
 		cumap->curr.xmax -= fx;
 		cumap->curr.ymax -= fy;
 		
-		data->draglastx = mx;
-		data->draglasty = my;
+		data->draglastx = evtx;
+		data->draglasty = evty;
 
 		changed = 1;
 	}
@@ -4268,7 +4275,7 @@ static int ui_do_but_CURVE(bContext *C, uiBlock *block, uiBut *but, uiHandleButt
 	mx = event->x;
 	my = event->y;
 	ui_window_to_block(data->region, block, &mx, &my);
-
+	
 	if (data->state == BUTTON_STATE_HIGHLIGHT) {
 		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
 			CurveMapping *cumap = (CurveMapping *)but->poin;
@@ -4358,11 +4365,11 @@ static int ui_do_but_CURVE(bContext *C, uiBlock *block, uiBut *but, uiHandleButt
 			}
 
 			data->dragsel = sel;
-
-			data->dragstartx = mx;
-			data->dragstarty = my;
-			data->draglastx = mx;
-			data->draglasty = my;
+			
+			data->dragstartx = event->x;
+			data->dragstarty = event->y;
+			data->draglastx = event->x;
+			data->draglasty = event->y;
 
 			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
 			return WM_UI_HANDLER_BREAK;
@@ -4370,8 +4377,9 @@ static int ui_do_but_CURVE(bContext *C, uiBlock *block, uiBut *but, uiHandleButt
 	}
 	else if (data->state == BUTTON_STATE_NUM_EDITING) {
 		if (event->type == MOUSEMOVE) {
-			if (mx != data->draglastx || my != data->draglasty) {
-				if (ui_numedit_but_CURVE(but, data, event->ctrl, mx, my, event->shift))
+			if (event->x != data->draglastx || event->y != data->draglasty) {
+				
+				if (ui_numedit_but_CURVE(block, but, data, event->ctrl, event->x, event->y, event->shift))
 					ui_numedit_apply(C, block, but, data);
 			}
 		}