# version: 0.3 # Author: Miguel Martinez Lopez try: from Tkinter import Frame except ImportError: from tkinter import Frame # Python 3 support try: basestring except NameError: basestring = str class Item(Frame): def __init__(self, master, value, width, height, selection_handler=None, drag_handler = None, drop_handler=None, **kwargs): kwargs.setdefault("class_", "Item") Frame.__init__(self, master, **kwargs) self._x = None self._y = None self._width = width self._height = height self._tag = "item%s"%id(self) self._value = value self._selection_handler = selection_handler self._drag_handler = drag_handler self._drop_handler = drop_handler @property def x(self): return self._x @property def y(self): return self._y @property def width(self): return self._width @property def height(self): return self._height @property def value(self): return self._value def init(self, container, x, y): self._x = x self._y = y self.place(in_=container, x=x, y=y, width=self._width, height=self._height) self.bind_class(self._tag, "", self._on_selection) self.bind_class(self._tag, "", self._on_drag) self.bind_class(self._tag, "", self._on_drop) self._add_bindtag(self) # Python3 compatibility: dict.values() return a view list_of_widgets = list(self.children.values()) while len(list_of_widgets) != 0: widget = list_of_widgets.pop() list_of_widgets.extend(widget.children.values()) self._add_bindtag(widget) def _add_bindtag(self, widget): bindtags = widget.bindtags() if self._tag not in bindtags: widget.bindtags((self._tag,) + bindtags) def _on_selection(self, event): self.tkraise() self._move_lastx = event.x_root self._move_lasty = event.y_root if self._selection_handler: self._selection_handler(self) def _on_drag(self, event): self.master.update_idletasks() cursor_x = self._x + event.x cursor_y = self._y + event.y self._x += event.x_root - self._move_lastx self._y += event.y_root - self._move_lasty self._move_lastx = event.x_root self._move_lasty = event.y_root self.place_configure(x=self._x, y=self._y) if self._drag_handler: self._drag_handler(cursor_x, cursor_y) def _on_drop(self, event): if self._drop_handler: self._drop_handler() def set_position(self, x,y): self._x = x self._y = y self.place_configure(x =x, y =y) def move(self, dx, dy): self._x += dx self._y += dy self.place_configure(x =self._x, y =self._y) class DDList(Frame): def __init__(self, master, item_width, item_height, item_relief=None, item_background=None, item_borderwidth=None, offset_x=0, offset_y=0, gap=0, **kwargs): kwargs["width"] = item_width+offset_x*2 kwargs["height"] = offset_y*2 Frame.__init__(self, master, **kwargs) self._item_borderwidth = item_borderwidth self._item_relief = item_relief self._item_background = item_background self._item_width = item_width self._item_height = item_height self._offset_x = offset_x self._offset_y = offset_y self._left = offset_x self._top = offset_y self._right = self._offset_x + self._item_width self._bottom = self._offset_y self._gap = gap self._index_of_selected_item = None self._index_of_empty_container = None self._list_of_items = [] self._position = {} self._new_y_coord_of_selected_item = None def create_item(self, value=None, **kwargs): if self._item_relief is not None: kwargs.setdefault("relief", self._item_relief) if self._item_borderwidth is not None: kwargs.setdefault("borderwidth", self._item_borderwidth) if self._item_background is not None: kwargs.setdefault("background", self._item_background) item = Item(self.master, value, self._item_width, self._item_height, self._on_item_selected, self._on_item_dragged, self._on_item_dropped, **kwargs) return item def configure_items(self, **kwargs): for item in self._list_of_items: item.configure(**kwargs) def add_item(self, item, index=None): if index is None: index = len(self._list_of_items) else: if not -len(self._list_of_items) < index < len(self._list_of_items): raise ValueError("Item index out of range") for i in range(index, len(self._list_of_items)): _item = self._list_of_items[i] _item.move(0, self._item_height + self._gap) self._position[_item] += 1 x = self._offset_x y = self._offset_y + index * (self._item_height + self._gap) self._list_of_items.insert(index, item) self._position[item] = index item.init(self, x,y) if len(self._list_of_items) == 1: self._bottom += self._item_height else: self._bottom += self._item_height + self._gap self.configure(height=self._bottom + self._offset_y) return item def delete_item(self, index): if isinstance(index, Item): index = self._position[index] else: if not -len(self._list_of_items) < index < len(self._list_of_items): raise ValueError("Item index out of range") item = self._list_of_items.pop(index) value = item.value del self._position[item] item.destroy() for i in range(index, len(self._list_of_items)): _item = self._list_of_items[i] _item.move(0, -(self._item_height+self._gap)) self._position[_item] -= 1 if len(self._list_of_items) == 0: self._bottom -= self._item_height else: self._bottom -= self._item_height + self._gap self.configure(height=self._bottom + self._offset_y) return value del_item = delete_item def pop(self): return self.delete_item(-1) def shift(self): return self.delete_item(0) def append(self, item): self.add_item(item) def unshift(self, item): self.add_item(0, item) def get_item(self, index): return self._list_of_items[index] def get_value(self, index): return self._list_of_items[index].value def _on_item_selected(self, item): self._index_of_selected_item = self._position[item] self._index_of_empty_container = self._index_of_selected_item def _on_item_dragged(self, x, y): if self._left < x < self._right and self._top < y < self._bottom: quotient, remainder = divmod(y-self._offset_y, self._item_height + self._gap) if remainder < self._item_height: new_container = quotient if new_container != self._index_of_empty_container: if new_container > self._index_of_empty_container: for index in range(self._index_of_empty_container+1, new_container+1, 1): item = self._get_item_of_virtual_list(index) item.move(0,-(self._item_height+self._gap)) else: for index in range(self._index_of_empty_container-1, new_container-1, -1): item = self._get_item_of_virtual_list(index) item.move(0,self._item_height+self._gap) self._index_of_empty_container = new_container def _get_item_of_virtual_list(self, index): if self._index_of_empty_container == index: raise Exception("No item in index: %s"%index) else: if self._index_of_empty_container != self._index_of_selected_item: if index > self._index_of_empty_container: index -= 1 if index >= self._index_of_selected_item: index += 1 item = self._list_of_items[index] return item def _on_item_dropped(self): item = self._list_of_items.pop(self._index_of_selected_item) self._list_of_items.insert(self._index_of_empty_container, item) x = self._offset_x y = self._offset_y + self._index_of_empty_container *(self._item_height + self._gap) item.set_position(x,y) for i in range(min(self._index_of_selected_item, self._index_of_empty_container),max(self._index_of_selected_item, self._index_of_empty_container)+1): item = self._list_of_items[i] self._position[item] = i self._index_of_empty_container = None self._index_of_selected_item = None if __name__ == "__main__": try: from Tkinter import Tk, IntVar, Label, Entry, Button import tkMessageBox as messagebox from Tkconstants import * except ImportError: from tkinter import Tk, IntVar, Label, Entry, Button, messagebox from tkinter.constants import * root = Tk() root.title("DDList example") root.geometry("%dx%d%+d%+d"%(640, 550, 0, 0)) sortable_list = DDList(root, 200, 100, offset_x=10, offset_y=10, gap =10, item_borderwidth=1, item_relief="groove") sortable_list.pack(expand=True, fill=BOTH) for i in range(4): item = sortable_list.create_item(value=i) label = Label(item, text="this is a label %s"%i) label.pack(anchor=W, padx= (4,0), pady= (4,0)) sortable_list.add_item(item) frame = Frame(root) frame.pack(fill=X, pady=(0, 10)) indexVar = IntVar() label = Label(frame, text="Entry index of item to delete:") label.pack(side=LEFT, padx=(10,6)) entry_of_index = Entry(frame,textvariable= indexVar, width=3) def delete_item(): try: index = indexVar.get() except ValueError: messagebox.showerror("Error", "Not a valid integer") return entry_of_index.delete(0, END) sortable_list.delete_item(index) entry_of_index.bind('', delete_item) entry_of_index.pack(side=LEFT) Button(frame, text="Delete", command=delete_item).pack(side=LEFT, padx=(3,0)) root.mainloop()