From c2eca928c5a7be0444fcb5c41ffe77b557714575 Mon Sep 17 00:00:00 2001
From: Javier <dev.git@javispedro.com>
Date: Sat, 12 Sep 2020 02:21:04 +0200
Subject: when zooming out, place pages on a grid layout

---
 notebookview.cc | 61 ++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 47 insertions(+), 14 deletions(-)

(limited to 'notebookview.cc')

diff --git a/notebookview.cc b/notebookview.cc
index 1f97ead..833f8e8 100644
--- a/notebookview.cc
+++ b/notebookview.cc
@@ -25,7 +25,7 @@
 
 NotebookView::NotebookView(QWidget *parent) :
     QGraphicsView(parent), _nb(new AfdNotebook(this)), _replay(new PaperReplay(this)),
-    _zoom(100), _curPage(0)
+    _numColumns(1), _zoom(100), _curPage(0)
 {
 	setScene(new QGraphicsScene(this));
 	setTransformationAnchor(AnchorUnderMouse);
@@ -102,7 +102,12 @@ void NotebookView::setZoom(int zoom)
 {
 	if (zoom != _zoom) {
 		_zoom = zoom;
+		int oldNumColumns = _numColumns;
 		calculateScale();
+		if (_numColumns != oldNumColumns) {
+			layoutPages();
+		}
+		emit zoomChanged(_zoom);
 	}
 }
 
@@ -118,7 +123,7 @@ QRect NotebookView::getCurPageTrim() const
 
 QImage NotebookView::exportPage(int pageNum) const
 {
-	const QRect pageTrim = getCurPageTrim();
+	const QRect pageTrim = _nb->getPageTrim(pageNum);
 	QImage image(pageTrim.width() / 4, pageTrim.height() / 4, QImage::Format_RGB32);
 	QPainter painter(&image);
 	painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
@@ -162,6 +167,16 @@ void NotebookView::nextPage()
 	}
 }
 
+void NotebookView::focusOnPage(int pageNum)
+{
+	if (_pages.contains(pageNum)) {
+		if (_zoom < 100) {
+			setZoom(100);
+		}
+		setCurPage(pageNum);
+	}
+}
+
 void NotebookView::resizeEvent(QResizeEvent *event)
 {
 	QGraphicsView::resizeEvent(event);
@@ -226,21 +241,11 @@ bool NotebookView::createPages()
 			_maxPageSize.setHeight(box.height());
 		}
 		_pages.insert(pageNum, page);
-	}
-
-	calculateScale();
-
-	qreal curY = 0;
-	foreach (PageItem *page, _pages) {
-		QRectF box = page->boundingRect();
-		page->setPos((_maxPageSize.width() - box.width()) / 2.0, curY);
-		curY += box.height();
-		curY += PAGE_SEPARATION;
-
 		scene()->addItem(page);
 	}
 
-	scene()->setSceneRect(0, 0, _maxPageSize.width(), curY);
+	calculateScale();
+	layoutPages();
 
 	return true;
 }
@@ -253,12 +258,40 @@ void NotebookView::calculateScale()
 	qreal baseScale = qMin(viewRect.width() / _maxPageSize.width(),
 	                       viewRect.height() / _maxPageSize.height());
 	resetTransform();
+	_numColumns = 1;
+
 	scale(baseScale, baseScale);
+
 	if (_zoom < 100) {
 		qreal s = 0.25 + ((_zoom / 100.0) * 0.75);
+		int potentialColumns = viewRect.width() / (_maxPageSize.width() * baseScale * s);
+		if (potentialColumns >= 2) {
+			_numColumns = std::min(potentialColumns, _pages.size());
+		}
 		scale(s, s);
 	} else if (_zoom > 100) {
 		qreal s = 1.0 + (_zoom - 100) * 0.015;
 		scale(s, s);
 	}
 }
+
+void NotebookView::layoutPages()
+{
+	const int numRows = (_pages.size() + 1) / _numColumns;
+	const QSizeF pageSpace( _maxPageSize.width() + PAGE_SEPARATION,
+	                        _maxPageSize.height() + PAGE_SEPARATION);
+
+	int pageIndex = 0;
+	foreach (PageItem *page, _pages) {
+		QRectF box = page->boundingRect();
+		qreal curX = (pageIndex % _numColumns) * pageSpace.width();
+		qreal curY = (pageIndex / _numColumns) * pageSpace.height();
+		page->setPos(curX + (_maxPageSize.width() - box.width()) / 2.0,
+		             curY + (_maxPageSize.height() - box.height()) / 2.0);
+		pageIndex++;
+	}
+
+	scene()->setSceneRect(0, 0,
+	                      pageSpace.width() * _numColumns,
+	                      pageSpace.height() * numRows);
+}
-- 
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