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from PyQt5.QtCore import QRectF
from PyQt5.QtGui import QColor, QImage, QPainter
from PyQt5.QtWidgets import QGraphicsTextItem, QStyleOptionGraphicsItem
 
from demoitem import DemoItem
 
 
class DemoTextItem(DemoItem):
    STATIC_TEXT, DYNAMIC_TEXT = range(2)
 
    def __init__(self, text, font, textColor, textWidth, parent=None, type=STATIC_TEXT, bgColor=QColor()):
        super(DemoTextItem, self).__init__(parent)
 
        self.type = type
        self.text = text
        self.font = font
        self.textColor = textColor
        self.bgColor = bgColor
        self.textWidth = textWidth
        self.noSubPixeling = True
 
    def setText(self, text):
        self.text = text
        self.update()
 
    def createImage(self, transform):
        if self.type == DemoTextItem.DYNAMIC_TEXT:
            return None
 
        sx = min(transform.m11(), transform.m22())
        sy = max(transform.m22(), sx)
 
        textItem = QGraphicsTextItem()
        textItem.setHtml(self.text)
        textItem.setTextWidth(self.textWidth)
        textItem.setFont(self.font)
        textItem.setDefaultTextColor(self.textColor)
        textItem.document().setDocumentMargin(2)
 
        w = textItem.boundingRect().width()
        h = textItem.boundingRect().height()
        image = QImage(int(w * sx), int(h * sy),
                QImage.Format_ARGB32_Premultiplied)
        image.fill(QColor(0, 0, 0, 0).rgba())
        painter = QPainter(image)
        painter.scale(sx, sy)
        style = QStyleOptionGraphicsItem()
        textItem.paint(painter, style, None)
 
        return image
 
    def animationStarted(self, id=0):
        self.noSubPixeling = False
 
    def animationStopped(self, id=0):
        self.noSubPixeling = True
 
    def boundingRect(self):
        if self.type == DemoTextItem.STATIC_TEXT:
            return super(DemoTextItem, self).boundingRect()
 
        # Sorry for using magic number.
        return QRectF(0, 0, 50, 20)
 
    def paint(self, painter, option, widget):
        if self.type == DemoTextItem.STATIC_TEXT:
            super(DemoTextItem, self).paint(painter, option, widget)
            return
 
        painter.setPen(self.textColor)
        painter.drawText(0, 0, self.text)