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try to fix profile scaling

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Different approach here:

- profile gets a bit higher, this was requested on the mailinglist, and
  seems to behave much better with the painted profile, we'd otherwise
  get it magically clipped on the right hand side.
- Make the scaling dpi aware, this fixes scaling for me on the Nexus7, I
  haven't been able to test it properly on other devices, so this needs
  some more testing. The result is visually quite close to what we can
  do, although I'm still getting a somewhat larger margin on the right.
  To get at the devicePixelRatio without too much custom code, I've
  added a property to the QMLProfile to retrieve it from the theme engine.

Signed-off-by: Sebastian Kügler <sebas@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Sebastian Kügler 2016-01-13 03:05:06 +01:00 committed by Dirk Hohndel
parent 8199c13f42
commit 53024ca76d
3 changed files with 37 additions and 12 deletions
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7
qt-mobile/qml/DiveDetailsView.qml
View file

@ -28,7 +28,6 @@ Item {
GridLayout {
id: mainLayout
anchors {
//fill: parent
top: parent.top
left: parent.left
right: parent.right
@ -118,9 +117,11 @@ Item {
QMLProfile {
id: qmlProfile
Layout.fillWidth: true
Layout.minimumHeight: Layout.preferredHeight
Layout.preferredHeight: width * 0.66
Layout.preferredHeight: Layout.minimumHeight
Layout.minimumHeight: width * 0.75
Layout.columnSpan: 4
clip: false
devicePixelRatio: MobileComponents.Units.devicePixelRatio
Rectangle {
color: "transparent"
opacity: 0.6

35
qt-mobile/qmlprofile.cpp
View file

@ -40,21 +40,30 @@ void QMLProfile::setDiveId(const QString &diveId)
static bool firstRun = true;
static QTransform profileTransform;
m_diveId = diveId;
double marginFactor = 0.013; // margin as proportion of profile display width
struct dive *d = get_dive_by_uniq_id(m_diveId.toInt());
if (m_diveId.toInt() < 1)
return;
if (!d)
return;
qDebug() << "setDiveId called with pos/size" << x() << y() << width() << height();
//qDebug() << "setDiveId called with pos/size" << x() << y() << width() << height();
// set the profile widget's geometry and scale the viewport so
// the scene fills it, then plot the dive on that widget
// the profile widget doesn't handle subsequent geometry changes well,
// so only do it once, then scale the image to the item's dimension.
if (firstRun) {
firstRun = false;
m_profileWidget->setGeometry(QRect(x(), y(), width(), height()));
profileTransform.scale(width() / 100, height() / 100);
}
// scale the profile widget's image to devicePixelRatio and a magic number
qreal dpr = (80 * (m_devicePixelRatio > 2 ? m_devicePixelRatio : 1.0));
qreal sx = width() / dpr;
qreal sy = height() / dpr;
// don't forget to reset, otherwise we're
// scaling scaled items, growing it bigger and bigger with every pass
profileTransform.reset();
profileTransform.scale(sx, sy);
//qDebug() << "scale:" << sx << sy;
m_profileWidget->setTransform(profileTransform);
qDebug() << "effective transformation:" <<
m_profileWidget->transform().m11() <<
@ -66,10 +75,18 @@ void QMLProfile::setDiveId(const QString &diveId)
m_profileWidget->transform().m31() <<
m_profileWidget->transform().m32() <<
m_profileWidget->transform().m33();
m_profileWidget->plotDive(d);
// scale the profile to create a margin
// the profile height is ~2/3 the width, so to create an even margin,
// the scale reduction for height should be 3/2 the reduction for width
m_profileWidget->scale(1 - 2 * marginFactor, 1 - 3 * marginFactor);
}
qreal QMLProfile::devicePixelRatio() const
{
return m_devicePixelRatio;
}
void QMLProfile::setDevicePixelRatio(qreal dpr)
{
if (dpr != m_devicePixelRatio) {
m_devicePixelRatio = dpr;
emit devicePixelRatioChanged();
}
}

7
qt-mobile/qmlprofile.h
View file

@ -9,6 +9,8 @@ class QMLProfile : public QQuickPaintedItem
{
Q_OBJECT
Q_PROPERTY(QString diveId READ diveId WRITE setDiveId NOTIFY diveIdChanged)
Q_PROPERTY(qreal devicePixelRatio READ devicePixelRatio WRITE setDevicePixelRatio NOTIFY devicePixelRatioChanged)
public:
explicit QMLProfile(QQuickItem *parent = 0);
virtual ~QMLProfile();
@ -17,15 +19,20 @@ public:
QString diveId() const;
void setDiveId(const QString &diveId);
qreal devicePixelRatio() const;
void setDevicePixelRatio(qreal dpr);
public slots:
void setMargin(int margin);
private:
QString m_diveId;
qreal m_devicePixelRatio;
int m_margin;
ProfileWidget2 *m_profileWidget;
signals:
void rightAlignedChanged();
void diveIdChanged();
void devicePixelRatioChanged();
};
#endif // QMLPROFILE_H