# coding: utf-8
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"""Module contains an elidable label
"""

__license__ = "MIT"
__date__ = "07/12/2018"

from silx.gui import qt


class ElidedLabel(qt.QLabel):
    """QLabel with an edile property.

    By default if the text is too big, it is elided on the right.

    This mode can be changed with :func:`setElideMode`.

    In case the text is elided, the full content is displayed as part of the
    tool tip. This behavior can be disabled with :func:`setTextAsToolTip`.
    """

    def __init__(self, parent=None):
        super(ElidedLabel, self).__init__(parent)
        self.__text = ""
        self.__toolTip = ""
        self.__textAsToolTip = True
        self.__textIsElided = False
        self.__elideMode = qt.Qt.ElideRight
        self.__updateMinimumSize()

    def resizeEvent(self, event):
        self.__updateText()
        return qt.QLabel.resizeEvent(self, event)

    def setFont(self, font):
        qt.QLabel.setFont(self, font)
        self.__updateMinimumSize()
        self.__updateText()

    def __updateMinimumSize(self):
        metrics = self.fontMetrics()
        if qt.BINDING in ('PySide2', 'PyQt5'):
            width = metrics.width("...")
        else:  # Qt6
            width = metrics.horizontalAdvance("...")
        self.setMinimumWidth(width)

    def __updateText(self):
        metrics = self.fontMetrics()
        elidedText = metrics.elidedText(self.__text, self.__elideMode, self.width())
        qt.QLabel.setText(self, elidedText)
        wasElided = self.__textIsElided
        self.__textIsElided = elidedText != self.__text
        if self.__textIsElided or wasElided != self.__textIsElided:
            self.__updateToolTip()

    def __updateToolTip(self):
        if self.__textIsElided and self.__textAsToolTip:
            qt.QLabel.setToolTip(self, self.__text + "<br/>" + self.__toolTip)
        else:
            qt.QLabel.setToolTip(self, self.__toolTip)

    # Properties

    def setText(self, text):
        self.__text = text
        self.__updateText()

    def getText(self):
        return self.__text

    text = qt.Property(str, getText, setText)

    def setToolTip(self, toolTip):
        self.__toolTip = toolTip
        self.__updateToolTip()

    def getToolTip(self):
        return self.__toolTip

    toolTip = qt.Property(str, getToolTip, setToolTip)

    def setElideMode(self, elideMode):
        """Set the elide mode.

        :param qt.Qt.TextElideMode elidMode: Elide mode to use
        """
        self.__elideMode = elideMode
        self.__updateText()

    def getElideMode(self):
        """Returns the used elide mode.

        :rtype: qt.Qt.TextElideMode
        """
        return self.__elideMode

    elideMode = qt.Property(qt.Qt.TextElideMode, getToolTip, setToolTip)

    def setTextAsToolTip(self, enabled):
        """Enable displaying text as part of the tooltip if it is elided.

        :param bool enabled: Enable the behavior
        """
        if self.__textAsToolTip == enabled:
            return
        self.__textAsToolTip = enabled
        self.__updateToolTip()

    def getTextAsToolTip(self):
        """True if an elided text is displayed as part of the tooltip.

        :rtype: bool
        """
        return self.__textAsToolTip

    textAsToolTip = qt.Property(bool, getTextAsToolTip, setTextAsToolTip)
