import sys
from PySide.QtGui import *
from PySide.QtCore import *

class ItemButton( QPushButton ):
    '''A custom button object that is dragable and holds an item which represents the data for the respective tool'''

    def __init__( self, item, parent=None ):
        '''item is a dictionary representing a downloadable tool'''
        super( ItemButton, self ).__init__( parent )
        self.item = item
        self.setText( item['name'] )
        self.setAcceptDrops( True )        #ONLY NEEDED TO BE ABLE TO IDENTIFY "SLOPPY" CLICKS

    def openDetailsPage( self ):
        print 'Opens Item page for %s - not yet implemented' % self.item

    def mouseMoveEvent( self, event ):
        '''Enable drag&drop of buttons'''
        self.startDragPos = event.pos()
        print 'started drag at:', self.startDragPos
        self.setDown( False ) #PREVENT THE BUTTON FORM STAYING DOWN
        mimeData = QMimeData() # IMPLEMENT THIS TO BE ABLE TO DROP INTO NUKE
        drag = QDrag( self )
        drag.setMimeData( mimeData )
        drag.setHotSpot( event.pos() - self.rect().topLeft() )
        dropAction = drag.start( Qt.CopyAction )

    def dragEnterEvent( self, event ):
        #ONLY NEEDED TO BE ABLE TO IDENTIFY "SLOPPY" CLICKS
        event.accept()

    def dropEvent( self, event ):
        #ONLY NEEDED TO BE ABLE TO IDENTIFY "SLOPPY" CLICKS
        print 'stopped drag at:', event.pos()
        point = event.pos() - self.startDragPos
        if point.manhattanLength() < 5:
            # EXECUTE MOUSE CLICK EVEN IF CURSOR MOVED A LITTLE BIT DURING CLICK
            self.openDetailsPage()
        event.accept()

    def mouseReleaseEvent( self, event ):
        '''when button is released after static click (no drag)'''
        QPushButton.mousePressEvent( self, event ) # NEEDED TO MAKE BUTTON APPEAR TO BE PRESSED
        if event.button() == Qt.LeftButton:
            self.openDetailsPage()
            self.setDown( False )

def main():
    app = QApplication( sys.argv )
    item = { 'name':'test item' }
    w = QWidget()
    w.setLayout( QVBoxLayout() )
    w.layout().addWidget( ItemButton( item ) )
    w.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()