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scanwidget: draw based on font metrics (closes #328)

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This commit is contained in:
Robert Jördens 2016-03-12 13:09:31 +01:00
parent 5e7eff6c4d
commit 5714ffe758
1 changed files with 10 additions and 5 deletions
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15
artiq/gui/scanwidget.py
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@ -15,12 +15,17 @@ class ScanAxis(QtWidgets.QWidget):
self.proxy = None
self.sizePolicy().setControlType(QtWidgets.QSizePolicy.ButtonBox)
self.ticker = Ticker()
self.setMinimumHeight(40)
qfm = QtGui.QFontMetrics(QtGui.QFont())
lineSpacing = qfm.lineSpacing()
descent = qfm.descent()
self.setMinimumHeight(2*lineSpacing + descent + 5 + 5)
def paintEvent(self, ev):
painter = QtGui.QPainter(self)
font = painter.font()
avgCharWidth = QtGui.QFontMetrics(font).averageCharWidth()
qfm = QtGui.QFontMetrics(painter.font())
avgCharWidth = qfm.averageCharWidth()
lineSpacing = qfm.lineSpacing()
descent = qfm.descent()
painter.setRenderHint(QtGui.QPainter.Antialiasing)
# The center of the slider handles should reflect what's displayed
# on the spinboxes.
@ -29,7 +34,7 @@ class ScanAxis(QtWidgets.QWidget):
realLeft = self.proxy.pixelToReal(0)
realRight = self.proxy.pixelToReal(self.width())
ticks, prefix, labels = self.ticker(realLeft, realRight)
painter.drawText(0, -25, prefix)
painter.drawText(0, -5-descent-lineSpacing, prefix)
pen = QtGui.QPen()
pen.setWidth(2)
@ -38,7 +43,7 @@ class ScanAxis(QtWidgets.QWidget):
for t, l in zip(ticks, labels):
t = self.proxy.realToPixel(t)
painter.drawLine(t, 0, t, -5)
painter.drawText(t - len(l)/2*avgCharWidth, -10, l)
painter.drawText(t - len(l)/2*avgCharWidth, -5-descent, l)
sliderStartPixel = self.proxy.realToPixel(self.proxy.realStart)
sliderStopPixel = self.proxy.realToPixel(self.proxy.realStop)