From bf5ccbe56631ac516751a9f194b643f77fdedf82 Mon Sep 17 00:00:00 2001
From: Arno <am@disconnect.de>
Date: Sat, 16 Oct 2010 14:08:16 +0200
Subject: Hover for FilesTreeWidget

Hovering over a cover item in FilesTreeWidget shows a HoverWindow with
the scaled image under the cursor.
---
 filestreewidget.cpp | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 filestreewidget.h   |  5 ++++
 hoverwindow.cpp     | 14 ++++++++++-
 hoverwindow.h       |  1 +
 4 files changed, 88 insertions(+), 2 deletions(-)

diff --git a/filestreewidget.cpp b/filestreewidget.cpp
index a941612..0dab9a2 100644
--- a/filestreewidget.cpp
+++ b/filestreewidget.cpp
@@ -269,7 +269,10 @@ void FilesTreeWidget::fileSelectionChanged(const QItemSelection &selected, const
 	emit sizeChanged(mSelectedSize);
 }
 
-FilesTreeView::FilesTreeView(QWidget *parent) : QTreeView(parent){}
+FilesTreeView::FilesTreeView(QWidget *parent) : QTreeView(parent){
+	setAttribute(Qt::WA_Hover);
+	mHoverWin = new HoverWindow;
+}
 
 void FilesTreeView::contextMenuEvent(QContextMenuEvent *event){
 	QMenu ctxMenu;
@@ -279,6 +282,71 @@ void FilesTreeView::contextMenuEvent(QContextMenuEvent *event){
 	ctxMenu.exec(event->globalPos());
 }
 
+bool FilesTreeView::event(QEvent *e){
+	QModelIndex curIdx;
+	QHoverEvent *hEvent = static_cast<QHoverEvent*>(e);
+	QPoint hotSpot(hEvent->pos().x(), hEvent->pos().y() - SmGlobals::instance()->cursorOffset());
+	QPoint globalPos = mapToGlobal(hotSpot);
+	QPoint where = globalPos + QPoint(30, 0);
+
+	curIdx = indexAt(hotSpot);
+	if((e->type() == QEvent::HoverEnter) || (e->type() == QEvent::HoverMove)){
+		if(!curIdx.isValid()){
+			return true;
+		}
+		if(!curIdx.column() == 0){
+			mCurHover = QModelIndex();
+			mHoverWin->setVisible(false);
+			return true;
+		}
+		if(!curIdx.isValid()){
+			return true;
+		}
+		QVariant fileType = curIdx.data(FilesTreeModel::FileTypeRole);
+		if(!fileType.isValid()){
+			mHoverWin->setVisible(false);
+			return true;
+		}
+		if(fileType.toInt() == FilesTreeModel::Movie){
+			mHoverWin->setVisible(false);
+			return true;
+		}
+	}
+
+	if(e->type() == QEvent::HoverEnter){
+		mCurHover = curIdx;
+		QPixmap pm = QPixmap(curIdx.data(FilesTreeModel::FullPathRole).toString());
+		mHoverWin->setPixmap(pm);
+		if(mHoverWin->pixmapHeight()){
+			where = QPoint(where.x(), where.y() - mHoverWin->pixmapHeight() / 2);
+		}
+		mHoverWin->move(where);
+		mHoverWin->setVisible(true);
+		return true;
+	}
+	if(e->type() == QEvent::HoverMove){
+		if(mHoverWin->pixmapHeight()){
+			where = QPoint(where.x(), where.y() - mHoverWin->pixmapHeight() / 2);
+		}
+		if(curIdx != mCurHover){
+			mCurHover = curIdx;
+			mHoverWin->setPixmap(QPixmap(curIdx.data(FilesTreeModel::FullPathRole).toString()));
+			mHoverWin->setVisible(false);
+			mHoverWin->move(where);
+			mHoverWin->setVisible(true);
+			return true;
+		}else{
+			mHoverWin->move(where);
+			return true;
+		}
+	}
+	if(e->type() == QEvent::HoverLeave){
+		mHoverWin->setVisible(false);
+		return true;
+	}
+	return QTreeView::event(e);
+}
+
 FilesTreeSortModel::FilesTreeSortModel(QObject *parent) : QSortFilterProxyModel(parent) {}
 
 bool FilesTreeSortModel::lessThan(const QModelIndex &left, const QModelIndex &right) const{
diff --git a/filestreewidget.h b/filestreewidget.h
index c340020..c385f43 100644
--- a/filestreewidget.h
+++ b/filestreewidget.h
@@ -66,6 +66,11 @@ class FilesTreeView : public QTreeView {
 
 	protected:
 		virtual void contextMenuEvent(QContextMenuEvent *event);
+		virtual bool event(QEvent *event);
+
+	private:
+		QModelIndex mCurHover;
+		HoverWindow *mHoverWin;
 };
 
 class FilesTreeSortModel : public QSortFilterProxyModel {
diff --git a/hoverwindow.cpp b/hoverwindow.cpp
index 59c851e..8c5f227 100644
--- a/hoverwindow.cpp
+++ b/hoverwindow.cpp
@@ -37,5 +37,17 @@ void HoverWindow::setContent(const QString &parent, const QStringList &children)
 }
 
 void HoverWindow::setPixmap(const QPixmap &pm){
-	mLabel->setPixmap(pm);
+	QPixmap curPm = pm;
+	if(curPm.height() > 500){
+		curPm = curPm.scaledToHeight(500);
+	}
+	if(curPm.width() > 300){
+		curPm = curPm.scaledToWidth(300);
+	}
+	mLabel->setPixmap(curPm);
+}
+
+int HoverWindow::pixmapHeight() const{
+	const QPixmap *pm = mLabel->pixmap();
+	return pm ? pm->height() : 0;
 }
diff --git a/hoverwindow.h b/hoverwindow.h
index b020124..6991d0b 100644
--- a/hoverwindow.h
+++ b/hoverwindow.h
@@ -18,6 +18,7 @@ class HoverWindow : public QWidget {
 		explicit HoverWindow(QWidget *parent = 0, Qt::WindowFlags f = Qt::FramelessWindowHint);
 		void setContent(const QString &parent, const QStringList &children);
 		void setPixmap(const QPixmap &pm);
+		int pixmapHeight() const;
 
 	private:
 		QLabel *mLabel;
-- 
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