drag_button.py

"""@package docstring
Drag button class.
This class creates a dragbutton which can be clicked, dragged and dropped.
"""

import os.path

from properties_window import PropertiesWindow

from PyQt5.QtWidgets import QPushButton, QMenu, QAction
from PyQt5.QtCore import Qt, QSize, pyqtSignal
from PyQt5.QtGui import QIcon

from utils import decorate_class, handle_error


@decorate_class(handle_error)
class DragButton(QPushButton):
    connectionRequested = pyqtSignal(QPushButton)
    moved = pyqtSignal()
    def __init__(self, name, operation, operation_path_name, is_show_name, window, parent = None):
        self.name = name
        self.is_show_name = is_show_name
        self._window = window
        self.operation = operation
        self.operation_path_name = operation_path_name
        self.clicked = 0
        self.pressed = False
        self._mouse_press_pos = None
        self._mouse_move_pos = None
        super(DragButton, self).__init__(self._window)

    def contextMenuEvent(self, event):
        menu = QMenu()
        properties = QAction("Properties")
        menu.addAction(properties)
        properties.triggered.connect(self.show_properties_window)
        menu.exec_(self.cursor().pos())

    def show_properties_window(self, event):
        self.properties_window = PropertiesWindow(self, self._window)
        self.properties_window.show()

    def add_label(self, label):
        self.label = label

    def mousePressEvent(self, event):

        if event.button() == Qt.LeftButton:
            self._mouse_press_pos = event.pos()
            self._mouse_move_pos = event.pos()

            for signal in self._window.signalList:
                signal.update()

            self.clicked += 1
            if self.clicked == 1:
                self.pressed = True
                self.setStyleSheet("background-color: grey; border-style: solid;\
                border-color: black; border-width: 2px")
                path_to_image = os.path.join('operation_icons', self.operation_path_name + '_grey.png')
                self.setIcon(QIcon(path_to_image))
                self.setIconSize(QSize(55, 55))
                self._window.pressed_button.append(self)

            elif self.clicked == 2:
                self.clicked = 0
                self.pressed = False
                self.setStyleSheet("background-color: white; border-style: solid;\
                border-color: black; border-width: 2px")
                path_to_image = os.path.join('operation_icons', self.operation_path_name + '.png')
                self.setIcon(QIcon(path_to_image))
                self.setIconSize(QSize(55, 55))
                self._window.pressed_button.remove(self)

        super(DragButton, self).mousePressEvent(event)

    def mouseMoveEvent(self, event):
        if event.buttons() == Qt.LeftButton:
            self.move(self.mapToParent(event.pos() - self._mouse_press_pos))

        self._window.update()
        super(DragButton, self).mouseMoveEvent(event)

    def mouseReleaseEvent(self, event):
        if self._mouse_press_pos is not None:
            moved = event.pos() - self._mouse_press_pos
            if moved.manhattanLength() > 3:
                event.ignore()
                return

        super(DragButton, self).mouseReleaseEvent(event)

    def remove(self):
        self.deleteLater()