qt_helpers.py

from PyQt4 import QtCore, QtGui


class ImageLabel(QtGui.QWidget):
    def __init__(self, text, image_path, parent=None):
        QtGui.QWidget.__init__(self, parent=parent)

        lay = QtGui.QVBoxLayout()

        self.setLayout(lay)
        self.setSizePolicy(QtGui.QSizePolicy.Fixed,
                           QtGui.QSizePolicy.Fixed)

        self.pic = QtGui.QLabel()
        self.pixmap = QtGui.QPixmap(image_path)
        mode = QtCore.Qt.KeepAspectRatio
        self.pic.setPixmap(self.pixmap.scaled(70, 70, mode))
        self.pic.setStyleSheet("margin:5px; border:1px solid rgb(0, 0, 0); ")
        lay.addWidget(self.pic)

        self.label = QtGui.QLabel(text)
        lay.addWidget(self.label)

    def mouseReleaseEvent(self, event):
        self.parent().item_clicked(self)


class FlowLayout(QtGui.QLayout):
    def __init__(self, parent=None, margin=0, spacing=-1):
        super(FlowLayout, self).__init__(parent)

        if parent is not None:
            self.setMargin(margin)

        self.setSpacing(spacing)

        self.itemList = []

    def __del__(self):
        item = self.takeAt(0)
        while item:
            item = self.takeAt(0)

    def addItem(self, item):
        self.itemList.append(item)

    def count(self):
        return len(self.itemList)

    def itemAt(self, index):
        if 0 <= index < len(self.itemList):
            return self.itemList[index]

        return None

    def takeAt(self, index):
        if 0 <= index < len(self.itemList):
            return self.itemList.pop(index)

        return None

    def expandingDirections(self):
        return QtCore.Qt.Orientations(QtCore.Qt.Orientation(0))

    def hasHeightForWidth(self):
        return True

    def heightForWidth(self, width):
        height = self.doLayout(QtCore.QRect(0, 0, width, 0), True)
        return height

    def setGeometry(self, rect):
        super(FlowLayout, self).setGeometry(rect)
        self.doLayout(rect, False)

    def sizeHint(self):
        return self.minimumSize()

    def minimumSize(self):
        size = QtCore.QSize()

        for item in self.itemList:
            size = size.expandedTo(item.minimumSize())

        size += QtCore.QSize(2 * self.margin(), 2 * self.margin())
        return size

    def doLayout(self, rect, testOnly):
        x = rect.x()
        y = rect.y()
        lineHeight = 0

        for item in self.itemList:
            wid = item.widget()
            spaceX = self.spacing() + wid.style().layoutSpacing(QtGui.QSizePolicy.PushButton, QtGui.QSizePolicy.PushButton, QtCore.Qt.Horizontal)
            spaceY = self.spacing() + wid.style().layoutSpacing(QtGui.QSizePolicy.PushButton, QtGui.QSizePolicy.PushButton, QtCore.Qt.Vertical)
            nextX = x + item.sizeHint().width() + spaceX
            if nextX - spaceX > rect.right() and lineHeight > 0:
                x = rect.x()
                y = y + lineHeight + spaceY
                nextX = x + item.sizeHint().width() + spaceX
                lineHeight = 0

            if not testOnly:
                item.setGeometry(QtCore.QRect(QtCore.QPoint(x, y), item.sizeHint()))

            x = nextX
            lineHeight = max(lineHeight, item.sizeHint().height())

        return y + lineHeight - rect.y()