Visibility check more sofisticated

xtt/lib/flow/src/flow.h

@@ -42,6 +42,13 @@ typedef enum {
 	flow_eSelectPolicy_Partial
 	} flow_eSelectPolicy;
 
+typedef enum {
+     	flow_eVisible_Full,
+	flow_eVisible_Partial,
+	flow_eVisible_Top,
+	flow_eVisible_Bottom
+	} flow_eVisible;
+
 typedef enum {
 	flow_eObjectType_NoObject,
 	flow_eObjectType_Node,

xtt/lib/flow/src/flow_browapi.cpp

@@ -674,9 +674,19 @@ int brow_GetPreviousSibling( brow_tCtx ctx, brow_tObject object,
   return ctx->get_previous_sibling( (FlowArrayElem *)object, (FlowArrayElem **)sibling);
 }
 
-int brow_IsVisible( brow_tCtx ctx, brow_tObject object)
+int brow_IsVisible( brow_tCtx ctx, brow_tObject object, flow_eVisible type)
 {
-  return ctx->is_visible( (FlowArrayElem *)object);
+  return ctx->is_visible( (FlowArrayElem *)object, type);
+}
+
+int brow_GetFirstVisible( brow_tCtx ctx, brow_tObject *object)
+{
+  return ctx->get_first_visible( (FlowArrayElem **)object);
+}
+
+int brow_GetLastVisible( brow_tCtx ctx, brow_tObject *object)
+{
+  return ctx->get_last_visible( (FlowArrayElem **)object);
 }
 
 int brow_Page( brow_tCtx ctx, double factor)

xtt/lib/flow/src/flow_browapi.h

@@ -198,7 +198,9 @@ int brow_GetNextSibling( brow_tCtx ctx, brow_tObject object,
 		brow_tObject *sibling);
 int brow_GetPreviousSibling( brow_tCtx ctx, brow_tObject object, 
 		brow_tObject *sibling);
-int brow_IsVisible( brow_tCtx ctx, brow_tObject object);
+int brow_IsVisible( brow_tCtx ctx, brow_tObject object, flow_eVisible type);
+int brow_GetFirstVisible( brow_tCtx ctx, brow_tObject *object);
+int brow_GetLastVisible( brow_tCtx ctx, brow_tObject *object);
 int brow_Page( brow_tCtx ctx, double factor);
 int brow_CreateSecondaryCtx( brow_tCtx ctx, brow_tCtx *secondary_ctx,
         int (*init_proc)(brow_tCtx ctx, void *client_data),

xtt/lib/flow/src/flow_browctx.cpp

@@ -185,7 +185,7 @@ int BrowCtx::print( char *filename)
 }
 
 
-int BrowCtx::is_visible( FlowArrayElem *element)
+int BrowCtx::is_visible( FlowArrayElem *element, flow_eVisible type)
 {
   double ll_x, ll_y, ur_x, ur_y;
   double window_low, window_high;
@@ -193,10 +193,32 @@ int BrowCtx::is_visible( FlowArrayElem *element)
   ((FlowNode *)element)->measure( &ll_x, &ll_y, &ur_x, &ur_y);
   window_low = double(offset_y) / zoom_factor;
   window_high = double(offset_y + window_height) / zoom_factor;
+  switch ( type) {
+  case flow_eVisible_Full:
     if ( ll_y >= window_low && ur_y <= window_high)
       return 1;
     else
       return 0;
+  case flow_eVisible_Partial:
+    if ( (ll_y >= window_low && ll_y <= window_high) ||
+	 (ur_y >= window_low && ur_y <= window_high) ||
+	 (ll_y <= window_low && ur_y >= window_high))
+      return 1;
+    else
+      return 0;
+  case flow_eVisible_Top:
+    if ( ur_y >= window_low && ur_y <= window_high)
+      return 1;
+    else
+      return 0;
+  case flow_eVisible_Bottom:
+    if ( ll_y >= window_low && ll_y <= window_high)
+      return 1;
+    else
+      return 0;
+  default: ;
+  }
+  return 0;
 }
 
 void BrowCtx::center_object( FlowArrayElem *object, double factor)
@@ -215,6 +237,44 @@ void BrowCtx::center_object( FlowArrayElem *object, double factor)
   change_scrollbar();
 }
 
+int BrowCtx::get_first_visible( FlowArrayElem **element)
+{
+  double ll_x, ll_y, ur_x, ur_y;
+  double window_low, window_high;
+  int i;
+
+  window_low = double(offset_y) / zoom_factor;
+  window_high = double(offset_y + window_height) / zoom_factor;
+
+  for ( i = 0; i < a.size(); i++) {
+    ((FlowNode *)a[i])->measure( &ll_x, &ll_y, &ur_x, &ur_y);
+    if ( ll_y >= window_low || ur_y >= window_high) {
+      *element = a[i];
+      return 1;
+    }
+  }
+  return 0;
+}
+
+int BrowCtx::get_last_visible( FlowArrayElem **element)
+{
+  double ll_x, ll_y, ur_x, ur_y;
+  double window_low, window_high;
+  int i;
+
+  window_low = double(offset_y) / zoom_factor;
+  window_high = double(offset_y + window_height) / zoom_factor;
+
+  for ( i = a.size() - 1; i >= 0; i--) {
+    ((FlowNode *)a[i])->measure( &ll_x, &ll_y, &ur_x, &ur_y);
+    if ( ur_y <= window_high || ll_y <= window_low) {
+      *element = a[i];
+      return 1;
+    }
+  }
+  return 0;
+}
+
 int BrowCtx::page( double factor)
 {
   double ll_x, ll_y, ur_x, ur_y;

xtt/lib/flow/src/flow_browctx.h

@@ -37,7 +37,9 @@ class BrowCtx : public FlowCtx {
     		{ return a.brow_get_next_sibling( element, sibling);};
     int get_previous_sibling( FlowArrayElem *element, FlowArrayElem **sibling)
     		{ return a.brow_get_previous_sibling( element, sibling);};
-    int is_visible( FlowArrayElem *element);
+    int is_visible( FlowArrayElem *element, flow_eVisible type);
+    int get_first_visible( FlowArrayElem **element);
+    int get_last_visible( FlowArrayElem **element);
     void center_object( FlowArrayElem *object, double factor);
     int page( double factor);
 

xtt/lib/flow/src/flow_draw.cpp

@@ -1601,8 +1601,10 @@ static void event_timer_cb( FlowCtx *ctx)
 static void cancel_event_timer( FlowCtx *ctx)
 {
   draw_tCtx draw_ctx  = (draw_tCtx) ctx->draw_ctx;
-  if ( draw_ctx->timer_id)
+  if ( draw_ctx->timer_id) {
     XtRemoveTimeOut( draw_ctx->timer_id);
+    draw_ctx->timer_id = 0;
+  }
 //  printf( "Timer removed\n");
 //  sys$cantim( ctx, 0);
 }