initial support for shift + right-mouse-click selection.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@20903 a592a061-630c-0410-9148-cb99ea01b6c8

src/BufferView.cpp

@@ -1697,13 +1697,14 @@ bool BufferView::checkDepm(Cursor & cur, Cursor & old)
 }
 
 
-bool BufferView::mouseSetCursor(Cursor & cur)
+bool BufferView::mouseSetCursor(Cursor & cur, bool select)
 {
 	BOOST_ASSERT(&cur.bv() == this);
 
-	// this event will clear selection so we save selection for
-	// persistent selection
-	cap::saveSelection(cursor());
+	if (!select)
+		// this event will clear selection so we save selection for
+		// persistent selection
+		cap::saveSelection(cursor());
 
 	// Has the cursor just left the inset?
 	bool badcursor = false;
@@ -1711,12 +1712,15 @@ bool BufferView::mouseSetCursor(Cursor & cur)
 	if (leftinset)
 		badcursor = notifyCursorLeaves(d.cursor_, cur);
 
+	// FIXME: shift-mouse selection doesn't work well across insets.
+	bool do_selection = select && &d.cursor_.anchor().inset() == &cur.inset();
+
 	// do the dEPM magic if needed
 	// FIXME: (1) move this to InsetText::notifyCursorLeaves?
 	// FIXME: (2) if we had a working InsetText::notifyCursorLeaves,
 	// the leftinset bool would not be necessary (badcursor instead).
 	bool update = leftinset;
-	if (!badcursor && d.cursor_.inTexted())
+	if (!do_selection && !badcursor && d.cursor_.inTexted())
 		update |= checkDepm(cur, d.cursor_);
 
 	// if the cursor was in an empty script inset and the new
@@ -1738,7 +1742,11 @@ bool BufferView::mouseSetCursor(Cursor & cur)
 
 	d.cursor_.setCursor(dit);
 	d.cursor_.boundary(cur.boundary());
-	d.cursor_.clearSelection();
+	if (do_selection)
+		d.cursor_.setSelection();
+	else
+		d.cursor_.clearSelection();
+
 	finishUndo();
 	return update;
 }

src/BufferView.h

@@ -190,7 +190,7 @@ public:
 	bool checkDepm(Cursor & cur, Cursor & old);
 	/// sets cursor.
 	/// This is used when handling LFUN_MOUSE_PRESS.
-	bool mouseSetCursor(Cursor & cur);
+	bool mouseSetCursor(Cursor & cur, bool select = false);
 
 	/// sets the selection.
 	/* When \c backwards == false, set anchor

src/Text3.cpp

@@ -922,11 +922,14 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
 	// Single-click on work area
 	case LFUN_MOUSE_PRESS: {
 		// Right click on a footnote flag opens float menu
+		// FIXME: Why should we clear the selection in this case?
 		if (cmd.button() == mouse_button::button3)
 			cur.clearSelection();
 
+		bool do_selection = cmd.button() == mouse_button::button1
+			&& cmd.argument() == "region-select";
 		// Set the cursor
-		bool update = bv->mouseSetCursor(cur);
+		bool update = bv->mouseSetCursor(cur, do_selection);
 
 		// Insert primary selection with middle mouse
 		// if there is a local selection in the current buffer,