# coding: utf-8
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"""This module defines two main classes:
- :class:`FrameBrowser`: a widget with 4 buttons (first, previous, next,
last) to browse between frames and a text entry to access a specific frame
by typing it's number)
- :class:`HorizontalSliderWithBrowser`: a FrameBrowser with an additional
slider. This class inherits :class:`qt.QAbstractSlider`.
"""
from silx.gui import qt
from silx.gui import icons
from silx.utils import deprecation
__authors__ = ["V.A. Sole", "P. Knobel"]
__license__ = "MIT"
__date__ = "16/01/2017"
[docs]class FrameBrowser(qt.QWidget):
"""Frame browser widget, with 4 buttons/icons and a line edit to provide
a way of selecting a frame index in a stack of images.
.. image:: img/FrameBrowser.png
It can be used in more generic case to select an integer within a range.
:param QWidget parent: Parent widget
:param int n: Number of frames. This will set the range
of frame indices to 0--n-1.
If None, the range is initialized to the default QSlider range (0--99).
"""
sigIndexChanged = qt.pyqtSignal(object)
def __init__(self, parent=None, n=None):
qt.QWidget.__init__(self, parent)
# Use the font size as the icon size to avoid to create bigger buttons
fontMetric = self.fontMetrics()
iconSize = qt.QSize(fontMetric.height(), fontMetric.height())
self.mainLayout = qt.QHBoxLayout(self)
self.mainLayout.setContentsMargins(0, 0, 0, 0)
self.mainLayout.setSpacing(0)
self.firstButton = qt.QPushButton(self)
self.firstButton.setIcon(icons.getQIcon("first"))
self.firstButton.setIconSize(iconSize)
self.previousButton = qt.QPushButton(self)
self.previousButton.setIcon(icons.getQIcon("previous"))
self.previousButton.setIconSize(iconSize)
self._lineEdit = qt.QLineEdit(self)
self._label = qt.QLabel(self)
self.nextButton = qt.QPushButton(self)
self.nextButton.setIcon(icons.getQIcon("next"))
self.nextButton.setIconSize(iconSize)
self.lastButton = qt.QPushButton(self)
self.lastButton.setIcon(icons.getQIcon("last"))
self.lastButton.setIconSize(iconSize)
self.mainLayout.addWidget(self.firstButton)
self.mainLayout.addWidget(self.previousButton)
self.mainLayout.addWidget(self._lineEdit)
self.mainLayout.addWidget(self._label)
self.mainLayout.addWidget(self.nextButton)
self.mainLayout.addWidget(self.lastButton)
if n is None:
first = qt.QSlider().minimum()
last = qt.QSlider().maximum()
else:
first, last = 0, n
self._lineEdit.setFixedWidth(self._lineEdit.fontMetrics().boundingRect('%05d' % last).width())
validator = qt.QIntValidator(first, last, self._lineEdit)
self._lineEdit.setValidator(validator)
self._lineEdit.setText("%d" % first)
self._label.setText("of %d" % last)
self._index = first
"""0-based index"""
self.firstButton.clicked.connect(self._firstClicked)
self.previousButton.clicked.connect(self._previousClicked)
self.nextButton.clicked.connect(self._nextClicked)
self.lastButton.clicked.connect(self._lastClicked)
self._lineEdit.editingFinished.connect(self._textChangedSlot)
[docs] def lineEdit(self):
"""Returns the line edit provided by this widget.
:rtype: qt.QLineEdit
"""
return self._lineEdit
def _firstClicked(self):
"""Select first/lowest frame number"""
self.setValue(self.getRange()[0])
def _previousClicked(self):
"""Select previous frame number"""
self.setValue(self.getValue() - 1)
def _nextClicked(self):
"""Select next frame number"""
self.setValue(self.getValue() + 1)
def _lastClicked(self):
"""Select last/highest frame number"""
self.setValue(self.getRange()[1])
def _textChangedSlot(self):
"""Select frame number typed in the line edit widget"""
txt = self._lineEdit.text()
if not len(txt):
self._lineEdit.setText("%d" % self._index)
return
new_value = int(txt)
if new_value == self._index:
return
ddict = {
"event": "indexChanged",
"old": self._index,
"new": new_value,
"id": id(self)
}
self._index = new_value
self.sigIndexChanged.emit(ddict)
[docs] def getRange(self):
"""Returns frame range
:return: (first_index, last_index)
"""
validator = self.lineEdit().validator()
return validator.bottom(), validator.top()
[docs] def setRange(self, first, last):
"""Set minimum and maximum frame indices.
Initialize the frame index to *first*.
Update the label text to *" limits: first, last"*
:param int first: Minimum frame index
:param int last: Maximum frame index"""
bottom = min(first, last)
top = max(first, last)
self._lineEdit.validator().setTop(top)
self._lineEdit.validator().setBottom(bottom)
self.setValue(bottom)
# Update limits
self._label.setText(" limits: %d, %d " % (bottom, top))
@deprecation.deprecated(replacement="FrameBrowser.setRange",
since_version="0.8")
def setLimits(self, first, last):
return self.setRange(first, last)
[docs] def setNFrames(self, nframes):
"""Set minimum=0 and maximum=nframes-1 frame numbers.
Initialize the frame index to 0.
Update the label text to *"1 of nframes"*
:param int nframes: Number of frames"""
top = nframes - 1
self.setRange(0, top)
# display 1-based index in label
self._label.setText(" of %d " % top)
@deprecation.deprecated(replacement="FrameBrowser.getValue",
since_version="0.8")
def getCurrentIndex(self):
return self._index
[docs] def getValue(self):
"""Return current frame index"""
return self._index
[docs] def setValue(self, value):
"""Set 0-based frame index
Value is clipped to current range.
:param int value: Frame number"""
bottom = self.lineEdit().validator().bottom()
top = self.lineEdit().validator().top()
value = int(value)
if value < bottom:
value = bottom
elif value > top:
value = top
self._lineEdit.setText("%d" % value)
self._textChangedSlot()
[docs]class HorizontalSliderWithBrowser(qt.QAbstractSlider):
"""
Slider widget combining a :class:`QSlider` and a :class:`FrameBrowser`.
.. image:: img/HorizontalSliderWithBrowser.png
The data model is an integer within a range.
The default value is the default :class:`QSlider` value (0),
and the default range is the default QSlider range (0 -- 99)
The signal emitted when the value is changed is the usual QAbstractSlider
signal :attr:`valueChanged`. The signal carries the value (as an integer).
:param QWidget parent: Optional parent widget
"""
def __init__(self, parent=None):
qt.QAbstractSlider.__init__(self, parent)
self.setOrientation(qt.Qt.Horizontal)
self.mainLayout = qt.QHBoxLayout(self)
self.mainLayout.setContentsMargins(0, 0, 0, 0)
self.mainLayout.setSpacing(2)
self._slider = qt.QSlider(self)
self._slider.setOrientation(qt.Qt.Horizontal)
self._browser = FrameBrowser(self)
self.mainLayout.addWidget(self._slider, 1)
self.mainLayout.addWidget(self._browser)
self._slider.valueChanged[int].connect(self._sliderSlot)
self._browser.sigIndexChanged.connect(self._browserSlot)
[docs] def lineEdit(self):
"""Returns the line edit provided by this widget.
:rtype: qt.QLineEdit
"""
return self._browser.lineEdit()
[docs] def setMinimum(self, value):
"""Set minimum value
:param int value: Minimum value"""
self._slider.setMinimum(value)
maximum = self._slider.maximum()
self._browser.setRange(value, maximum)
[docs] def setMaximum(self, value):
"""Set maximum value
:param int value: Maximum value
"""
self._slider.setMaximum(value)
minimum = self._slider.minimum()
self._browser.setRange(minimum, value)
[docs] def setRange(self, first, last):
"""Set minimum/maximum values
:param int first: Minimum value
:param int last: Maximum value"""
self._slider.setRange(first, last)
self._browser.setRange(first, last)
def _sliderSlot(self, value):
"""Emit selected value when slider is activated
"""
self._browser.setValue(value)
self.valueChanged.emit(value)
def _browserSlot(self, ddict):
"""Emit selected value when browser state is changed"""
self._slider.setValue(ddict['new'])
[docs] def setValue(self, value):
"""Set value
:param int value: value"""
self._slider.setValue(value)
self._browser.setValue(value)
[docs] def value(self):
"""Get selected value"""
return self._slider.value()
