[PATCH] MainTab: tweak the scrolling while inside the notes

[Lubomir I. Ivanov]

From: "Lubomir I. Ivanov" <neolit123 at gmail.com>

Patch makes a couple of changes:
- if the notes receive focus set the 'inNotes' flag and scroll to the bottom
of the tab widget
- if 'inNotes' is set disable the mouse wheel for the entire widget except
the notes

This makes scrolling to the top of the notes not engage scrolling the
entire tab widget.

Fixes #176

Signed-off-by: Lubomir I. Ivanov <neolit123 at gmail.com>
---
 qt-ui/maintab.cpp | 17 ++++++++++++++++-
 qt-ui/maintab.h   |  1 +
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/qt-ui/maintab.cpp b/qt-ui/maintab.cpp
index edc425b..654ce98 100644
--- a/qt-ui/maintab.cpp
+++ b/qt-ui/maintab.cpp
@@ -28,7 +28,8 @@
 MainTab::MainTab(QWidget *parent) : QTabWidget(parent),
 				    weightModel(new WeightModel()),
 				    cylindersModel(CylindersModel::instance()),
-				    editMode(NONE)
+				    editMode(NONE),
+				    inNotes(false)
 {
 	ui.setupUi(this);
 	ui.cylinders->setModel(cylindersModel);
@@ -57,6 +58,8 @@ MainTab::MainTab(QWidget *parent) : QTabWidget(parent),
 	ui.divemaster->installEventFilter(this);
 	ui.buddy->installEventFilter(this);
 	ui.suit->installEventFilter(this);
+	ui.scrollArea->installEventFilter(this);
+	ui.notes->installEventFilter(this);
 	ui.notes->viewport()->installEventFilter(this);
 	ui.rating->installEventFilter(this);
 	ui.visibility->installEventFilter(this);
@@ -281,6 +284,18 @@ void MainTab::enableEdition(EditMode newEditMode)
 
 bool MainTab::eventFilter(QObject* object, QEvent* event)
 {
+	// if the notes receive focus set the inNotes flag and scroll to the bottom
+	if (isEnabled() && object == ui.notes) {
+		if (event->type() == QEvent::FocusIn) {
+			inNotes = true;
+			ui.scrollArea->verticalScrollBar()->setSliderPosition(ui.scrollArea->verticalScrollBar()->maximum());
+		}
+		if (event->type() == QEvent::FocusOut)
+			inNotes = false;
+	}
+	// if in notes disable the mouse wheel
+	if (isEnabled() && event->type() == QEvent::Wheel && object != ui.notes->viewport() && inNotes)
+		return true;
 	if (isEnabled() && event->type() == QEvent::KeyPress && object == ui.dateTimeEdit) {
 		tabBar()->setTabIcon(currentIndex(), QIcon(":warning"));
 		enableEdition();
diff --git a/qt-ui/maintab.h b/qt-ui/maintab.h
index aed8f9e..40b55a4 100644
--- a/qt-ui/maintab.h
+++ b/qt-ui/maintab.h
@@ -94,6 +94,7 @@ private:
 	CylindersModel *cylindersModel;
 	QMap<dive*, NotesBackup> notesBackup;
 	EditMode editMode;
+	bool inNotes;
 
 	/* since the multi-edition of the equipment is fairly more
 	 * complex than a single item, because it involves a Qt
-- 
1.7.11.msysgit.0