Polish charactermap example

- Use Qt 5 connection syntax.
- Introduce helper function to calculate the square size, remove
  the existing 24 pixel limitation since that makes it impossible
  to render 20pt fonts.
- Add filter chooser for font filters.
- Add menu and info dialog showing DPI and default fonts.
- Streamline code

Change-Id: I0cd4d0475b5a7ed3c475de7a413abebbe688dfe2
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>

1 files changed, 10 insertions, 7 deletions

diff --git a/examples/widgets/widgets/charactermap/characterwidget.cpp b/examples/widgets/widgets/charactermap/characterwidget.cpp
index 1b8cb226f7..47aff4f5be 100644
--- a/examples/widgets/widgets/charactermap/characterwidget.cpp
+++ b/examples/widgets/widgets/charactermap/characterwidget.cpp
@@ -44,11 +44,9 @@
 
 //! [0]
 CharacterWidget::CharacterWidget(QWidget *parent)
-    : QWidget(parent)
+    : QWidget(parent), columns(16), lastKey(-1)
 {
-    squareSize = 24;
-    columns = 16;
-    lastKey = -1;
+    calculateSquareSize();
     setMouseTracking(true);
 }
 //! [0]
@@ -57,7 +55,7 @@ CharacterWidget::CharacterWidget(QWidget *parent)
 void CharacterWidget::updateFont(const QFont &font)
 {
     displayFont.setFamily(font.family());
-    squareSize = qMax(24, QFontMetrics(displayFont).xHeight() * 3);
+    calculateSquareSize();
     adjustSize();
     update();
 }
@@ -67,7 +65,7 @@ void CharacterWidget::updateFont(const QFont &font)
 void CharacterWidget::updateSize(const QString &fontSize)
 {
     displayFont.setPointSize(fontSize.toInt());
-    squareSize = qMax(24, QFontMetrics(displayFont).xHeight() * 3);
+    calculateSquareSize();
     adjustSize();
     update();
 }
@@ -79,7 +77,7 @@ void CharacterWidget::updateStyle(const QString &fontStyle)
     const QFont::StyleStrategy oldStrategy = displayFont.styleStrategy();
     displayFont = fontDatabase.font(displayFont.family(), fontStyle, displayFont.pointSize());
     displayFont.setStyleStrategy(oldStrategy);
-    squareSize = qMax(24, QFontMetrics(displayFont).xHeight() * 3);
+    calculateSquareSize();
     adjustSize();
     update();
 }
@@ -94,6 +92,11 @@ void CharacterWidget::updateFontMerging(bool enable)
     update();
 }
 
+void CharacterWidget::calculateSquareSize()
+{
+    squareSize = qMax(16, 4 + QFontMetrics(displayFont, this).height());
+}
+
 //! [3]
 QSize CharacterWidget::sizeHint() const
 {