From a193ea09f9c5e7f6c57fd9114ec8ea47befd008c Mon Sep 17 00:00:00 2001
From: Martin Vermeer <martin.vermeer@hut.fi>
Date: Mon, 20 Mar 2006 15:05:07 +0000
Subject: [PATCH] 	Selective expose patch

	* metricsinfo.h
	(ViewMetricsInfo): add size parameter

	* BufferView_pimpl.C
	(BufferView::Pimpl::metrics): return size

	* frontends/screen.C
	(LyXScreen::redraw): expose selectively, using y1, y2 in vi, and
	exposing lower grey at end using size test



git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@13432 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/BufferView_pimpl.C | 5 ++++-
 src/frontends/screen.C | 5 ++++-
 src/metricsinfo.h      | 5 +++--
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/BufferView_pimpl.C b/src/BufferView_pimpl.C
index d1529f798e..7a7ed01840 100644
--- a/src/BufferView_pimpl.C
+++ b/src/BufferView_pimpl.C
@@ -1348,6 +1348,8 @@ ViewMetricsInfo BufferView::Pimpl::metrics(bool singlepar)
 	theCoords.clear();
 	BufferView & bv = *bv_;
 	LyXText * const text = bv.text();
+	lyx::pit_type size = int(text->paragraphs().size());
+
 	if (anchor_ref_ > int(text->paragraphs().size() - 1)) {
 		anchor_ref_ = int(text->paragraphs().size() - 1);
 		offset_ref_ = 0;
@@ -1434,7 +1436,8 @@ ViewMetricsInfo BufferView::Pimpl::metrics(bool singlepar)
                 << " pit2: " << pit2
                 << " npit: " << npit
                 << " singlepar: " << singlepar
+                << "size: " << size
                 << endl;
 
-	return ViewMetricsInfo(pit1, pit2, y1, y2, singlepar);
+	return ViewMetricsInfo(pit1, pit2, y1, y2, singlepar, size);
 }
diff --git a/src/frontends/screen.C b/src/frontends/screen.C
index d7a1f34e55..b029e285c5 100644
--- a/src/frontends/screen.C
+++ b/src/frontends/screen.C
@@ -219,7 +219,10 @@ void LyXScreen::redraw(BufferView & bv, ViewMetricsInfo const & vi)
 	workarea().getPainter().start();
 	paintText(bv, vi);
 	lyxerr[Debug::DEBUG] << "Redraw screen" << endl;
-	expose(0, 0, workarea().workWidth(), workarea().workHeight());
+	int const ymin = std::max(vi.y1, 0);
+	int const ymax = 
+		( vi.p2 < vi.size - 1 ?  vi.y2 : workarea().workHeight() );
+	expose(0, ymin, workarea().workWidth(), ymax - ymin);
 	workarea().getPainter().end();
 	theCoords.doneUpdating();
 }
diff --git a/src/metricsinfo.h b/src/metricsinfo.h
index ad9b33f677..a1a241451e 100644
--- a/src/metricsinfo.h
+++ b/src/metricsinfo.h
@@ -102,13 +102,14 @@ class ViewMetricsInfo
 {
 public:
 	ViewMetricsInfo(lyx::pit_type p1, lyx::pit_type p2, int y1, int y2,
-			bool singlepar) : p1(p1), p2(p2), y1(y1), y2(y2),
-			singlepar(singlepar) {}
+			bool singlepar, lyx::pit_type size) : p1(p1), p2(p2), 
+			y1(y1), y2(y2), singlepar(singlepar), size(size) {}
 	lyx::pit_type p1;
 	lyx::pit_type p2;
 	int y1;
 	int y2;
 	bool singlepar;
+	lyx::pit_type size;
 };
 
 
-- 
2.39.5