[Performous-commit] Tapio Vierros : Optimize NoteLabel creation by delaying pixmap generation.

[Tapio V. <aa...@us...>]

Author: Tapio Vierros <tap...@gm...>
Date:   Thu Feb 24 18:55:16 2011 +0200

Optimize NoteLabel creation by delaying pixmap generation.

---

 notelabel.cc |    6 ++++--
 notelabel.hh |    4 +++-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/notelabel.cc b/notelabel.cc
index cc5f79e..207b6bc 100644
--- a/notelabel.cc
+++ b/notelabel.cc
@@ -3,6 +3,7 @@
 #include <QToolTip>
 #include <QPainter>
 #include <QMenu>
+#include <QTimer>
 #include <iostream>
 #include "notelabel.hh"
 #include "notegraphwidget.hh"
@@ -18,11 +19,11 @@ const double NoteLabel::min_length = 0.05; // How many seconds minimum
 NoteLabel::NoteLabel(const Note &note, QWidget *parent, bool floating)
 	: QLabel(parent), m_note(note), m_selected(false), m_floating(floating), m_resizing(0), m_hotspot()
 {
-	createPixmap();
 	updateLabel();
 	setMouseTracking(true);
 	setAttribute(Qt::WA_DeleteOnClose);
-	show();
+	// Deferred graphics generation (to make creation quick as object might also be deleted quickly)
+	QTimer::singleShot(2000, this, SLOT(createPixmap()));
 }
 
 void NoteLabel::createPixmap()
@@ -76,6 +77,7 @@ void NoteLabel::createPixmap()
 
 	setPixmap(QPixmap::fromImage(image));
 	updateTips();
+	show();
 }
 
 void NoteLabel::setSelected(bool state) {
diff --git a/notelabel.hh b/notelabel.hh
index 7f4a139..94602d2 100644
--- a/notelabel.hh
+++ b/notelabel.hh
@@ -15,7 +15,6 @@ public:
 
 	NoteLabel(const Note &note, QWidget *parent, bool floating = true);
 
-	void createPixmap();
 	QString lyric() const { return m_note.syllable; }
 	void setLyric(const QString &text) { m_note.syllable = text; createPixmap(); }
 	QString description(bool multiline) const;
@@ -42,6 +41,9 @@ public:
 
 	bool operator<(const NoteLabel &rhs) const { return m_note.begin < rhs.note().begin; }
 
+public slots:
+	void createPixmap();
+
 protected:
 	void resizeEvent(QResizeEvent *event);
 	void moveEvent(QMoveEvent *event);