# HG changeset patch
# User xerces
# Date 1333430066 14400
# Node ID 314b6b0235098609bfef26eb3ee374c402fbcd5d
# Parent  bac7e2ddad62168f019c74e03d4d5fb8906854cd
[mq]: bmesh_vertex_slide

diff -r bac7e2ddad62 -r 314b6b023509 release/scripts/startup/bl_ui/space_view3d.py
--- a/release/scripts/startup/bl_ui/space_view3d.py	Mon Apr 02 23:24:25 2012 -0400
+++ b/release/scripts/startup/bl_ui/space_view3d.py	Tue Apr 03 01:14:26 2012 -0400
@@ -1684,6 +1684,7 @@
         layout.operator("mesh.split")
         layout.operator("mesh.separate")
         layout.operator("mesh.vert_connect")
+        layout.operator("mesh.vert_slide")
 
         layout.separator()
 
diff -r bac7e2ddad62 -r 314b6b023509 source/blender/bmesh/CMakeLists.txt
--- a/source/blender/bmesh/CMakeLists.txt	Mon Apr 02 23:24:25 2012 -0400
+++ b/source/blender/bmesh/CMakeLists.txt	Tue Apr 03 01:14:26 2012 -0400
@@ -36,6 +36,7 @@
 set(SRC
 	operators/bmo_bevel.c
 	operators/bmo_connect.c
+	operators/bmo_slide.c
 	operators/bmo_create.c
 	operators/bmo_dissolve.c
 	operators/bmo_dupe.c
diff -r bac7e2ddad62 -r 314b6b023509 source/blender/bmesh/intern/bmesh_opdefines.c
--- a/source/blender/bmesh/intern/bmesh_opdefines.c	Mon Apr 02 23:24:25 2012 -0400
+++ b/source/blender/bmesh/intern/bmesh_opdefines.c	Tue Apr 03 01:14:26 2012 -0400
@@ -1103,6 +1103,23 @@
 	0
 };
 
+/*
+ * Vertex Slide
+ *
+ * Translates vertes along an edge
+ */
+static BMOpDefine bmo_vert_slide_def = {
+"vertslide",
+	{{BMO_OP_SLOT_ELEMENT_BUF, "vert"},
+	 {BMO_OP_SLOT_ELEMENT_BUF, "edge"},
+	 {BMO_OP_SLOT_ELEMENT_BUF, "vertout"},
+	 {BMO_OP_SLOT_FLT, "distance_t"},
+	 {0} /* null-terminating sentinel */},
+	bmo_vert_slide_exec,
+	BMO_OP_FLAG_UNTAN_MULTIRES
+};
+
+
 BMOpDefine *opdefines[] = {
 	&bmo_split_def,
 	&bmo_spin_def,
@@ -1170,6 +1187,7 @@
 	&bmo_bridge_loops_def,
 	&bmo_solidify_def,
 	&bmo_inset_def,
+	&bmo_vert_slide_def,
 };
 
 int bmesh_total_ops = (sizeof(opdefines) / sizeof(void *));
diff -r bac7e2ddad62 -r 314b6b023509 source/blender/bmesh/intern/bmesh_operators_private.h
--- a/source/blender/bmesh/intern/bmesh_operators_private.h	Mon Apr 02 23:24:25 2012 -0400
+++ b/source/blender/bmesh/intern/bmesh_operators_private.h	Tue Apr 03 01:14:26 2012 -0400
@@ -43,6 +43,7 @@
 void bmo_dissolve_verts_exec(BMesh *bmesh, BMOperator *op);
 void bmo_dissolve_limit_exec(BMesh *bmesh, BMOperator *op);
 void bmo_extrude_face_region_exec(BMesh *bm, BMOperator *op);
+void bmo_vert_slide_exec(BMesh *bm, BMOperator *op);
 void bmo_connectverts_exec(BMesh *bm, BMOperator *op);
 void bmo_extrude_vert_indiv_exec(BMesh *bm, BMOperator *op);
 void bmo_mesh_to_bmesh_exec(BMesh *bm, BMOperator *op);
diff -r bac7e2ddad62 -r 314b6b023509 source/blender/bmesh/operators/bmo_slide.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/blender/bmesh/operators/bmo_slide.c	Tue Apr 03 01:14:26 2012 -0400
@@ -0,0 +1,112 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Francisco De La Cruz
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+#include "MEM_guardedalloc.h"
+
+#include "BKE_global.h"
+
+#include "BLI_math.h"
+#include "BLI_array.h"
+#include "BLI_utildefines.h"
+
+#include "bmesh.h"
+
+#define EDGE_MARK 1
+#define VERT_MARK 2
+
+/*
+ * Slides a vertex along a connected edge
+ *
+ */
+void bmo_vert_slide_exec(BMesh *bm, BMOperator *op) {
+	BMOIter oiter;
+	BMIter iter;
+	BMHeader *h;
+	BMVert *vertex;
+	BMEdge *edge;
+	int is_start_v1 = 0;
+
+	/* Selection counts */
+	int selected_verts = 0;
+	int selected_edges = 0;
+
+	/* Get slide amount */
+	const float distance_t = BMO_slot_float_get(op, "distance_t");
+
+	/* Get start vertex */
+	vertex = BMO_iter_new(&oiter, bm, op, "vert", BM_VERT);
+
+
+	if (!vertex) {
+		if (G.debug & G_DEBUG)
+			fprintf(stderr, "vertslide: No vertex selected...");
+		return;
+	}
+
+	/* Count selected edges */
+	BMO_ITER(h, &oiter, bm, op, "edge", BM_VERT|BM_EDGE) {
+		switch (h->htype) {
+			case BM_VERT:
+				selected_verts++;
+				break;
+			case BM_EDGE:
+				selected_edges++;
+				/* Mark all selected edges (cast BMHeader->BMEdge) */
+				BMO_elem_flag_enable(bm, (BMElemF *) h, EDGE_MARK);
+				break;
+		}
+	}
+
+	/* Only allow sliding between two verts */
+
+	if (selected_verts != 2 || selected_edges == 0) {
+		if (G.debug & G_DEBUG)
+			fprintf(stderr, "vertslide: select a single edge\n");
+		return;
+	}
+
+	/* Make sure we get the correct edge. */
+	BM_ITER(edge, &iter, bm, BM_EDGES_OF_VERT, vertex) {
+		if (BMO_elem_flag_test(bm, edge, EDGE_MARK)) {
+			is_start_v1 = edge->v1 == vertex;
+			break;
+		}
+	}
+
+	/* Found edge */
+	if (edge) {
+
+		BMVert* other = BM_edge_other_vert(edge, vertex);
+
+		/* mark */
+		BMO_elem_flag_enable(bm, vertex, VERT_MARK);
+
+		/* Interpolate */
+		interp_v3_v3v3(vertex->co, vertex->co, other->co, distance_t);
+	}
+
+	/* Deselect the edges */
+	BMO_slot_buffer_hflag_disable(bm, op, "edge", BM_ALL, BM_ELEM_SELECT, TRUE);
+
+	/* Return the new edge. The same previously marked with VERT_MARK */
+	BMO_slot_buffer_from_enabled_flag(bm, op, "vertout", BM_VERT, VERT_MARK);
+	return;
+}
diff -r bac7e2ddad62 -r 314b6b023509 source/blender/editors/mesh/CMakeLists.txt
--- a/source/blender/editors/mesh/CMakeLists.txt	Mon Apr 02 23:24:25 2012 -0400
+++ b/source/blender/editors/mesh/CMakeLists.txt	Tue Apr 03 01:14:26 2012 -0400
@@ -46,6 +46,7 @@
 	editmesh_select.c
 	editmesh_tools.c
 	editmesh_utils.c
+	editmesh_slide.c
 	mesh_data.c
 	mesh_ops.c
 	meshtools.c
diff -r bac7e2ddad62 -r 314b6b023509 source/blender/editors/mesh/editmesh_slide.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/blender/editors/mesh/editmesh_slide.c	Tue Apr 03 01:14:26 2012 -0400
@@ -0,0 +1,609 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Francisco De La Cruz
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+/* Takes heavily from editmesh_loopcut.c */
+
+#include <float.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdio.h>
+
+#include "DNA_object_types.h"
+#include "DNA_screen_types.h"
+#include "DNA_userdef_types.h"
+#include "DNA_space_types.h"
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_array.h"
+#include "BLI_blenlib.h"
+#include "BLI_math.h"
+#include "BLI_utildefines.h"
+
+#include "BKE_blender.h"
+#include "BKE_context.h"
+#include "BKE_depsgraph.h"
+#include "BKE_mesh.h"
+#include "BKE_report.h"
+#include "BKE_tessmesh.h"
+
+#include "BIF_gl.h"
+#include "BIF_glutil.h"
+
+
+#include "ED_screen.h"
+#include "ED_view3d.h"
+#include "ED_mesh.h"
+#include "ED_space_api.h"
+
+#include "UI_resources.h"
+
+#include "RNA_access.h"
+#include "RNA_define.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "mesh_intern.h"
+
+#define VTX_SLIDE_SLIDE_SENS_F 15.0
+#define VTX_SLIDE_SLOW_SENS_F 0.3
+#define VTX_SLIDE_SNAP_THRSH 0.3
+
+static void vtx_slide_draw(const bContext *C, ARegion *ar, void *arg);
+static int edbm_vert_slide_exec(bContext *C, wmOperator *op);
+static void vtx_slide_exit(const bContext *C, wmOperator *op);
+
+/* Cusom VertexSlide Operator data */
+typedef struct VertexSlideOp {
+	/* Starting Vertex */
+	BMVert *start_vtx;
+	BMEdge *sel_edge;
+
+	ViewContext *view_context;
+	ARegion *active_region;
+
+	/* Draw callback handle */
+	void *draw_handle;
+
+	/* Active Object */
+	Object *obj;
+
+	/* Are we in slide mode */
+	int slide_mode;
+	int slow_mode;
+	int snap_to_end_vtx;
+	int snap_to_mid;
+
+	float distance;
+	float interp[3];
+
+	/* Edge Frame
+	  Count */
+	int disk_edges;
+
+	/* Edges */
+	float (*edge_frame)[3];
+
+	/* Mouse Click 2d pos */
+	int m_co[2];
+
+} VertexSlideOp;
+
+
+static int vtx_slide_init(bContext *C, wmOperator *op) {
+	Object *obedit = CTX_data_edit_object(C);
+	BMEditMesh *em = BMEdit_FromObject(obedit);
+	BMEditSelection *ese = em->bm->selected.first;
+
+	const char* header_str = "Vertex Slide: Hover over an edge and left-click to select slide edge. "
+				"Left-Shift: Midpoint Snap, Left-Alt: Snap, Left-Ctrl: Slow Move";
+
+	/* Allocate custom data */
+	VertexSlideOp *vso;
+	EDBM_selectmode_flush(em);
+	ese = em->bm->selected.first;
+
+	/* Is there a starting vertex  ? */
+	if (ese == NULL || ese->htype != BM_VERT) {
+		BKE_report(op->reports, RPT_ERROR_INVALID_INPUT, "Vertex Slide Error: Select a (single) vertex");
+		return FALSE;
+	}
+
+	vso = MEM_callocN(sizeof(VertexSlideOp), "Vertex Slide Operator");
+	vso->view_context = MEM_callocN(sizeof(ViewContext), "Vertex Slide View Context");
+
+	op->customdata = vso;
+
+	/* Set the start vertex */
+	vso->start_vtx = (BMVert *)ese->ele;
+	vso->sel_edge = NULL;
+
+	/* Edges */
+	vso->edge_frame = NULL;
+
+	vso->disk_edges = 0;
+
+	vso->slide_mode = FALSE;
+
+	vso->slow_mode = FALSE;
+
+	vso->snap_to_end_vtx = FALSE;
+
+	vso->snap_to_mid = FALSE;
+
+	vso->distance = 0.0f;
+
+	/* Add handler for the vertex sliding */
+	WM_event_add_modal_handler(C, op);
+
+	/* Notify the viewport */
+	view3d_operator_needs_opengl(C);
+
+	/* Set the drawing region */
+	vso->active_region = CTX_wm_region(C);
+
+	/* Set the draw callback */
+	vso->draw_handle = ED_region_draw_cb_activate(vso->active_region->type, vtx_slide_draw, vso, REGION_DRAW_POST_VIEW);
+
+	ED_area_headerprint(CTX_wm_area(C), header_str);
+
+	em_setup_viewcontext(C, vso->view_context);
+
+	/* Tag for redraw */
+	ED_region_tag_redraw(vso->active_region);
+
+	/* Set the object */
+	vso->obj = obedit;
+
+	return TRUE;
+}
+
+static void vtx_slide_confirm(bContext *C, wmOperator *op) {
+	/* Invoke operator */
+	edbm_vert_slide_exec(C, op);
+}
+
+static void vtx_slide_exit(const bContext *C, wmOperator *op) {
+	/* Fetch custom data */
+	VertexSlideOp *vso = op->customdata;
+	BMEditMesh *em = BMEdit_FromObject(vso->obj);
+
+	/* Clean-up the custom data */
+	ED_region_draw_cb_exit(vso->active_region->type, vso->draw_handle);
+	ED_region_tag_redraw(vso->active_region);
+
+	/* Store edit selection of the active vertex, allows other
+	*  ops to run without reselecting */
+	if (vso->start_vtx)
+		EDBM_editselection_store(em, &vso->start_vtx->head);
+
+	/* Free Custom Data
+	*
+	*/
+	MEM_freeN(vso->view_context);
+
+	vso->view_context = NULL;
+
+	if (vso->edge_frame) {
+		MEM_freeN(vso->edge_frame);
+	}
+
+	vso->edge_frame = NULL;
+
+	vso->slide_mode = FALSE;
+
+
+	MEM_freeN(vso);
+	vso = NULL;
+
+	/* Clear the header */
+	ED_area_headerprint(CTX_wm_area(C), NULL);
+
+}
+
+static void vtx_slide_draw(const bContext *C, ARegion *UNUSED(ar), void *arg) {
+	VertexSlideOp *vso = arg;
+
+	/* Have an edge to draw */
+	if (vso && vso->sel_edge) {
+		/* Get 3d view */
+		View3D *view3d = CTX_wm_view3d(C);
+		int outline_w = UI_GetThemeValuef(TH_OUTLINE_WIDTH) + 1;
+		int i = 0;
+		if (view3d && view3d->zbuf)
+			glDisable(GL_DEPTH_TEST);
+
+		glPushAttrib(GL_CURRENT_BIT|GL_LINE_BIT|GL_POINT_BIT);
+
+		glPushMatrix();
+		glMultMatrixf(vso->obj->obmat);
+
+		glEnable(GL_BLEND);
+		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+		/* Draw selected edge
+		 * Add color offset and reduce alpha */
+		UI_ThemeColorShadeAlpha(TH_EDGE_SELECT, 50, -50);
+
+		glLineWidth(outline_w);
+
+		glBegin(GL_LINES);
+		bglVertex3fv(vso->sel_edge->v1->co);
+		bglVertex3fv(vso->sel_edge->v2->co);
+		glEnd();
+
+
+		if (vso->disk_edges > 0) {
+			/* Draw intermediate edge frame */
+			UI_ThemeColorShadeAlpha(TH_EDGE_SELECT, 50, -50);
+
+			for (i = 0; i < vso->disk_edges; i++) {
+				glBegin(GL_LINES);
+				glVertex3fv(vso->edge_frame[i]);
+				glVertex3fv(vso->interp);
+				glEnd();
+			}
+		}
+
+
+		if (vso->slide_mode) {
+			/* Draw interpolated vertex */
+			int pt_size = UI_GetThemeValuef(TH_FACEDOT_SIZE) + 2;
+			UI_ThemeColorShadeAlpha(TH_FACE_DOT, -90, -50);
+
+			glPointSize(pt_size);
+
+			bglBegin(GL_POINTS);
+			bglVertex3fv(vso->interp);
+			bglEnd();
+		}
+
+		glDisable(GL_BLEND);
+		glPopMatrix();
+		glPopAttrib();
+
+		if (view3d && view3d->zbuf)
+			glEnable(GL_DEPTH_TEST);
+	}
+}
+
+static void vtx_slide_find_edge(VertexSlideOp *vso, wmEvent *event) {
+	/* Nearest edge */
+	BMEdge *nst_edge = NULL;
+
+	/* Temp Vtx */
+	BMVert *start_vtx = vso->start_vtx;
+
+	/* dist {input = max dist to search }
+	 *      { output = dist found } */
+	int dist = 50;
+
+	/* Set mouse coords */
+	vso->view_context->mval[0] = event->mval[0];
+	vso->view_context->mval[1] = event->mval[1];
+
+	/* Find nearest edge */
+	nst_edge = EDBM_edge_find_nearest(vso->view_context, &dist);
+
+	if (nst_edge) {
+		/* Find a connected edge */
+		if (nst_edge->v1 == start_vtx || nst_edge->v2 == start_vtx) {
+			/* Save mouse coords */
+			vso->m_co[0] = event->mval[0];
+			vso->m_co[1] = event->mval[1];
+
+			/* Set edge */
+			vso->sel_edge = nst_edge;
+		}
+	}
+}
+
+/* Updates the status of the operator - Invoked on mouse movement */
+static void vtx_slide_update(VertexSlideOp *vso, wmEvent *event) {
+	BMEdge* edge;
+	float edge_other_proj[3];
+	float start_vtx_proj[3];
+	BMVert* other;
+	/* Find nearest edge */
+	edge = vso->sel_edge;
+
+	if (edge) {
+		float interp[3];
+
+		/* Calculate interpolation value for preview */
+		float t_val;
+
+		float mval_float[] = { (float)event->mval[0], (float)event->mval[1]};
+		float closest_2d[2];
+
+		other = BM_edge_other_vert(edge, vso->start_vtx);
+
+		/* Project points onto screen and do interpolation in 2D */
+		project_float_noclip(vso->active_region, vso->start_vtx->co, start_vtx_proj);
+
+		project_float_noclip(vso->active_region, other->co, edge_other_proj);
+
+		closest_to_line_v2(closest_2d, mval_float, start_vtx_proj, edge_other_proj);
+
+		t_val = line_point_factor_v2(closest_2d, start_vtx_proj, edge_other_proj);
+
+		if (vso->slow_mode)
+			t_val = t_val * VTX_SLIDE_SLOW_SENS_F;
+
+		/* Snap to mid */
+		if (vso->snap_to_mid) {
+			t_val = 0.5f;
+		}
+
+		/* Interpolate preview vertex 3D */
+		interp_v3_v3v3(interp, vso->start_vtx->co, other->co, t_val);
+		copy_v3_v3(vso->interp, interp);
+
+		vso->distance = t_val;
+
+		/* If snapping */
+		if (vso->snap_to_end_vtx) {
+			int start_at_v1 = edge->v1 == vso->start_vtx;
+			float v1_d = len_v3v3(vso->interp, edge->v1->co);
+			float v2_d = len_v3v3(vso->interp, edge->v2->co);
+
+			if (v1_d > v2_d && v2_d < VTX_SLIDE_SNAP_THRSH) {
+				copy_v3_v3(vso->interp, edge->v2->co);
+
+				if (start_at_v1)
+					vso->distance = 1.0f;
+				else
+					vso->distance = 0.0f;
+			}
+			if (v2_d > v1_d && v1_d < VTX_SLIDE_SNAP_THRSH) {
+				copy_v3_v3(vso->interp, edge->v1->co);
+				if (start_at_v1)
+					vso->distance = 0.0f;
+				else
+					vso->distance = 1.0f;
+			}
+		}
+	}
+}
+
+/* Sets the outline frame */
+static void vtx_slide_set_frame(VertexSlideOp *vso) {
+	BMEdge* edge;
+	float (*edge_frame)[3] = NULL;
+	BLI_array_declare(edge_frame);
+	BMIter iter;
+	BMEditMesh *em = BMEdit_FromObject(vso->obj);
+	BMesh* bm = em->bm;
+	BMVert* sel_vtx = vso->start_vtx;
+	int idx = 0;
+
+	vso->disk_edges = 0;
+
+	if (vso->edge_frame) {
+		MEM_freeN(vso->edge_frame);
+		vso->edge_frame = NULL;
+	}
+
+	/* Iterate over edges of vertex and copy them */
+	BM_ITER_INDEX(edge, &iter, bm, BM_EDGES_OF_VERT, sel_vtx, idx) {
+		/* TODO: Deallocate this array */
+		BLI_array_growone(edge_frame);
+
+		if (sel_vtx == edge->v1)
+			copy_v3_v3(edge_frame[idx], edge->v2->co);
+		else
+			copy_v3_v3(edge_frame[idx], edge->v1->co);
+
+		vso->disk_edges++;
+	}
+
+	vso->edge_frame = edge_frame;
+
+	/* Select new edge */
+	BM_edge_select_set(bm, vso->sel_edge, TRUE);
+
+	/* Set the interp at starting vtx */
+	copy_v3_v3(vso->interp, sel_vtx->co);
+
+}
+
+static int edbm_vert_slide_modal(bContext *C, wmOperator *op, wmEvent *event) {
+	VertexSlideOp *vso = op->customdata;
+
+	/* Notify the viewport */
+	view3d_operator_needs_opengl(C);
+
+	switch (event->type) {
+		case LEFTSHIFTKEY: {
+			switch (event->val) {
+				case KM_PRESS:
+					vso->snap_to_mid = TRUE;
+					break;
+				case KM_RELEASE:
+					vso->snap_to_mid = FALSE;
+					break;
+			}
+
+			break;
+		}
+		case LEFTCTRLKEY: {
+			switch (event->val) {
+				case KM_PRESS:
+					vso->slow_mode = TRUE;
+					break;
+				case KM_RELEASE:
+					vso->slow_mode = FALSE;
+					break;
+			}
+
+			break;
+		}
+		case LEFTALTKEY: {
+			switch (event->val) {
+				case KM_PRESS:
+					vso->snap_to_end_vtx = TRUE;
+					break;
+				case KM_RELEASE:
+					vso->snap_to_end_vtx = FALSE;
+					break;
+			}
+
+			break;
+		}
+		case RIGHTMOUSE: {
+			/* Enforce redraw */
+			ED_region_tag_redraw(vso->active_region);
+
+			/* Clean-up */
+			vtx_slide_exit(C, op);
+
+			return OPERATOR_CANCELLED;
+		}
+		case LEFTMOUSE: {
+			if (event->val == KM_PRESS) {
+				/* Update mouse coords */
+				copy_v2_v2_int(vso->m_co, event->mval);
+
+				if (vso->slide_mode) {
+					vtx_slide_confirm(C, op);
+					/* Clean-up */
+					vtx_slide_exit(C, op);
+					return OPERATOR_FINISHED;
+				} else if (vso->sel_edge) {
+					vso->slide_mode = TRUE;
+
+					/* Sets the frame */
+					vtx_slide_set_frame(vso);
+				}
+			}
+
+			ED_region_tag_redraw(vso->active_region);
+			break;
+
+		}
+		case MOUSEMOVE: {
+			if (!vso->slide_mode) {
+				vtx_slide_find_edge(vso, event);
+			} else {
+				vtx_slide_update(vso, event);
+			}
+
+			ED_region_tag_redraw(vso->active_region);
+			break;
+		}
+	}
+
+	return OPERATOR_RUNNING_MODAL;
+}
+
+static int edbm_vert_slide_cancel(bContext *C, wmOperator *op) {
+	/* Exit the modal */
+	vtx_slide_exit(C, op);
+
+	return OPERATOR_CANCELLED;
+}
+
+static int edbm_vert_slide_invoke(bContext *C, wmOperator *op, wmEvent *UNUSED(event)) {
+
+	/* Initialize the operator */
+	if (vtx_slide_init(C, op))
+		return OPERATOR_RUNNING_MODAL;
+	else
+		return OPERATOR_CANCELLED;
+}
+
+/* Vertex Slide */
+static int edbm_vert_slide_exec(bContext *C, wmOperator *op) {
+	Object *obedit = CTX_data_edit_object(C);
+	BMEditMesh *em = BMEdit_FromObject(obedit);
+	BMesh *bm = em->bm;
+	BMVert *start_vert;
+	BMOperator bmop;
+	BMEditSelection *ese = em->bm->selected.first;
+
+	float distance_t = 0.0f;
+
+	/* Invoked modally? */
+	if (op->type->modal == edbm_vert_slide_modal && op->customdata) {
+		VertexSlideOp *vso = op->customdata;
+		distance_t = vso->distance;
+	} else {
+		/* Get Properties */
+		distance_t = RNA_float_get(op->ptr, "distance_t");
+	}
+
+	/* Is there a starting vertex  ? */
+	if (ese == NULL || ese->htype != BM_VERT) {
+		BKE_report(op->reports, RPT_ERROR_INVALID_INPUT, "Vertex Slide Error: Select a (single) vertex");
+		return OPERATOR_CANCELLED;
+	}
+
+	start_vert = (BMVert *)ese->ele;
+
+	/* Prepare operator */
+	if (!EDBM_op_init(em, &bmop, op, "vertslide vert=%e edge=%hfev distance_t=%f", start_vert, BM_ELEM_SELECT, distance_t))  {
+		return OPERATOR_CANCELLED;
+	}
+	/* Execute operator */
+	BMO_op_exec(bm, &bmop);
+
+	/* Select the edge */
+	BMO_slot_buffer_hflag_enable(bm, &bmop, "vertout", BM_ALL, BM_ELEM_SELECT, TRUE);
+
+	/* Flush the select buffers */
+	EDBM_selectmode_flush(em);
+
+	if (!EDBM_op_finish(em, &bmop, op, TRUE)) {
+		return OPERATOR_CANCELLED;
+	}
+
+	/* Update Geometry */
+	EDBM_update_generic(C, em, TRUE);
+
+	return OPERATOR_FINISHED;
+}
+
+void MESH_OT_vert_slide(wmOperatorType *ot) {
+	PropertyRNA *prop;
+
+	/* identifiers */
+	ot->name = "Vertex Slide";
+	ot->idname = "MESH_OT_vert_slide";
+	ot->description = "Vertex slide";
+
+	/* api callback */
+	ot->invoke = edbm_vert_slide_invoke;
+	ot->modal = edbm_vert_slide_modal;
+	ot->cancel = edbm_vert_slide_cancel;
+	ot->poll = ED_operator_editmesh_region_view3d;
+
+	/* ot->exec = edbm_vert_slide_exec;
+	 * ot->poll = ED_operator_editmesh; */
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* Properties for vertex slide */
+	prop = RNA_def_float(ot->srna, "distance_t", 0.0f, -FLT_MAX, FLT_MAX , "Distance", "Distance", -5.0f, 5.0f);
+	RNA_def_property_ui_range(prop, -5.0f, 5.0f, 0.1, 4);
+	RNA_def_property_flag(prop, PROP_SKIP_SAVE);
+}
diff -r bac7e2ddad62 -r 314b6b023509 source/blender/editors/mesh/mesh_intern.h
--- a/source/blender/editors/mesh/mesh_intern.h	Mon Apr 02 23:24:25 2012 -0400
+++ b/source/blender/editors/mesh/mesh_intern.h	Tue Apr 03 01:14:26 2012 -0400
@@ -214,6 +214,7 @@
 
 void MESH_OT_bridge_edge_loops(struct wmOperatorType *ot);
 void MESH_OT_inset(struct wmOperatorType *ot);
+void MESH_OT_vert_slide(struct wmOperatorType *ot);
 
 /* ******************* mesh_navmesh.c */
 void MESH_OT_navmesh_make(struct wmOperatorType *ot);
diff -r bac7e2ddad62 -r 314b6b023509 source/blender/editors/mesh/mesh_ops.c
--- a/source/blender/editors/mesh/mesh_ops.c	Mon Apr 02 23:24:25 2012 -0400
+++ b/source/blender/editors/mesh/mesh_ops.c	Tue Apr 03 01:14:26 2012 -0400
@@ -155,6 +155,7 @@
 	WM_operatortype_append(MESH_OT_solidify);
 	WM_operatortype_append(MESH_OT_select_nth);
 	WM_operatortype_append(MESH_OT_vert_connect);
+	WM_operatortype_append(MESH_OT_vert_slide);
 	WM_operatortype_append(MESH_OT_knifetool);
 
 	WM_operatortype_append(MESH_OT_bevel);
@@ -335,6 +336,8 @@
 	WM_keymap_add_item(keymap, "MESH_OT_split", YKEY, KM_PRESS, 0, 0);
 	WM_keymap_add_item(keymap, "MESH_OT_vert_connect", JKEY, KM_PRESS, 0, 0);
 
+	/* Vertex Slide */
+	WM_keymap_add_item(keymap, "MESH_OT_vert_slide", VKEY, KM_PRESS, KM_SHIFT | KM_CTRL, 0);
 	/* use KM_CLICK because same key is used for tweaks */
 	kmi = WM_keymap_add_item(keymap, "MESH_OT_dupli_extrude_cursor", ACTIONMOUSE, KM_CLICK, KM_CTRL, 0);
 	RNA_boolean_set(kmi->ptr, "rotate_source", TRUE);