407 lines
12 KiB
Python
407 lines
12 KiB
Python
import curses
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from library.exceptions import LibrarianException
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from copy import copy
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import library.database as db
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class TextEntry:
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"""A part of a window that handles text entry.
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Properties:
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value holds the string that was entered
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Public Methods:
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set_geom(row,column,width) Sets the geometry in the window
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set_value(string) Set the value and redraw
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gain_focus() Gives it focus, moving cursor and changing the drawing
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lose_focus() Takes focus, moving cursor to start, changing drawing
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handle_input(ch) Pass this the ncurses key, and it manages input
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redraw() Redraw the text entry (should never need to do this
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"""
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# Public
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value = "" # Use the set_value function to set, but retrieve with value
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# Should be Private
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cursor = 0
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start = 0
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focus = False
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x = 0
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y = 0
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width = 10
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# Public methods
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def __init__(self, parent_window, value=""):
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self.w = parent_window
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self.value = value
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def set_geom(self,y,x,width):
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self.x = x
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self.y = y
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self.width = width
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def set_value(self,v):
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self.value=v
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self.cursor=len(v)
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self.redraw()
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def gain_focus(self):
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self.focus = True
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self._mv_cursor(+len(self.value))
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self.start = max(0,self.cursor-self.width)
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self.redraw()
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def lose_focus(self):
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self.focus = False
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self.cursor = 0
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self.start = 0
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self.redraw()
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def handle_input(self,ch):
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if ch==curses.KEY_LEFT:
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self._mv_cursor(-1)
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elif ch==curses.KEY_HOME:
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self._set_cursor(0)
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elif ch==curses.KEY_RIGHT:
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self._mv_cursor(+1)
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elif ch==curses.KEY_END:
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self._set_cursor(len(self.value))
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elif ch>=32 and ch<=126:
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self._insert(curses.keyname(ch).decode('utf-8'))
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elif ch==curses.KEY_BACKSPACE:
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self._backspace()
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elif ch==curses.KEY_DC:
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self._delete()
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def redraw(self):
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self.w.addnstr(self.y,self.x, self.value[self.start:]+" "*self.width, self.width)
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if self.focus:
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self.w.chgat(self.y, self.x, self.width, curses.A_UNDERLINE)
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curses.curs_set(1)
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# Private functions
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def _mv_cursor(self,delta):
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self._set_cursor(self.cursor + delta)
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def _set_cursor(self, new_c):
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self.cursor = max(0, min(len(self.value), new_c))
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self.start = max(0,self.cursor-self.width+1)
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self.redraw()
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# Place the drawn cursor in the correct spot
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col = self.x + self.cursor - self.start
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self.w.move(self.y,col)
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def _insert(self,ch):
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c = self.cursor
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self.value = self.value[:c] +ch+ self.value[c:]
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self._mv_cursor(+1)
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def _backspace(self):
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if self.cursor>0:
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c = self.cursor
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self.value=self.value[:c-1] + self.value[c:]
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self._mv_cursor(-1)
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def _delete(self):
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c = self.cursor
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self.value = self.value[:c] + self.value[c+1:]
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self._mv_cursor(0)
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class PasswordEntry(TextEntry):
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def redraw(self):
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self.w.addnstr(self.y,self.x, " "*self.width, self.width)
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if self.focus:
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self.w.chgat(self.y, self.x, self.width, curses.A_UNDERLINE)
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curses.curs_set(1)
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class FormWindow:
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"""General class for a Form Window.
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To use, make the window for it, call the constructor, then call event_loop.
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"""
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# Private variables
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mx = my = 0
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hl = 0
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bt = -1
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left = 0
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top = 2
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row = 2
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buttononly = False
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caption = "Form"
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blabel = "Done"
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labels = ["label1"]
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commands = [('pU', 'top'),('pD', 'bottom'),('Es', 'cancel')]
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# Public functions
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def __init__(self,window,helpbar,book={}, width=50):
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self.w = window
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self.w.resize(len(self.labels)+6,width)
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self.hb = helpbar
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self._make_entries()
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self._update_geometry()
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self._set_entries(book)
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def clear(self):
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self.w.erase()
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self.w.refresh()
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def event_loop(self):
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self.w.keypad(1)
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self.refresh()
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self.hl=0
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if self.buttononly:
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self.bt = 1
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self._highlight_button()
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else:
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self.entries[self.hl].gain_focus()
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ch = self.w.getch()
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while ch != 27:
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self.handle_input(ch)
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if ch==10 or ch==curses.KEY_ENTER:
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if self.bt==0:
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return {}
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elif self.bt==1:
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return self._return_values()
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else:
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self._mv_focus(+1)
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self.w.refresh()
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ch = self.w.getch()
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curses.curs_set(0)
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return {}
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def _make_entries(self):
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self.entries = []
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for e in range(len(self.labels)):
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self.entries.append(TextEntry(self.w))
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def _update_geometry(self):
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(self.my, self.mx) = self.w.getmaxyx()
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self.left=0
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for l in self.labels:
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self.left = max(len(l),self.left)
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self.left += 4
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width = self.mx-self.left-2
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self.top = 2
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for r in range(len(self.entries)):
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self.entries[r].set_geom(r+self.top, self.left, width)
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# next, the buttons
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self.brow = self.top+len(self.labels)+1
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self.bcol = [self.mx-len(self.blabel)-14, self.mx-len(self.blabel)-4]
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self.bwidth = [8,len(self.blabel)+2]
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def _set_entries(self,book):
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for (e, l) in enumerate(self.labels):
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if l.lower() in book:
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self.entries[e].value = str(book[l.lower()])
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else:
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self.entries[e].value = ""
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def redraw(self):
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self.w.box()
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self.w.addstr(0,(self.mx-len(self.caption))//2,self.caption)
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r=0
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for l in self.labels:
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c = self.left-len(l)-2
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self.w.addstr(r+self.top,c,l+":")
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self.entries[r].redraw()
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r+=1
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self.w.addstr(self.brow,self.bcol[0], "<cancel> <"+self.blabel+">")
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self.w.refresh()
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def refresh(self):
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self.hb.commands = self.commands
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self.hb.refresh()
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self._update_geometry()
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self.redraw()
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def _highlight_button(self):
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self.w.chgat(self.brow, self.bcol[self.bt], self.bwidth[self.bt], curses.A_REVERSE)
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curses.curs_set(0)
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def _unhighlight_button(self):
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self.w.chgat(self.brow,1,self.mx-2,curses.A_NORMAL)
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def _mv_focus(self,delta):
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if self.buttononly: return
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if self.bt==-1:
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self.entries[self.hl].lose_focus()
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else:
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self._unhighlight_button()
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new = self.hl+delta
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new = max(0, min(len(self.labels), new)) # the extra is for the buttons
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self.hl = new
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if new == len(self.labels):
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self.bt = 1
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self._highlight_button()
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else:
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self.bt=-1
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self.entries[self.hl].gain_focus()
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def _return_values(self):
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book = {}
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for k,e in zip(self.labels, self.entries):
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if e!="" and k.lower()!="publish date":
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book[k.lower()]=e.value
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return book
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def handle_input(self,ch):
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if ch==curses.KEY_UP:
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self._mv_focus(-1)
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elif ch==curses.KEY_PPAGE:
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self._mv_focus(-len(self.labels))
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elif ch==curses.KEY_DOWN:
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self._mv_focus(+1)
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elif ch==curses.KEY_NPAGE:
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self._mv_focus(+len(self.labels))
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elif ch==curses.KEY_LEFT:
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if self.bt==-1:
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self.entries[self.hl].handle_input(ch)
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else:
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self._unhighlight_button()
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self.bt=0
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self._highlight_button()
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elif ch==curses.KEY_HOME:
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if self.bt==-1:
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self._mv_cursor(-len(self.entries[self.hl]))
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elif ch==curses.KEY_RIGHT:
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if self.bt==-1:
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self.entries[self.hl].handle_input(ch)
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else:
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self._unhighlight_button()
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self.bt=1
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self._highlight_button()
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else:
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if self.bt==-1:
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self.entries[self.hl].handle_input(ch)
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class LoginForm(FormWindow):
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caption = "Enter your csclub login to access the mail server"
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blabel = "Login"
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labels = ["ID", "Password"]
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def _make_entries(self):
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self.entries = []
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self.entries.append(TextEntry(self.w))
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self.entries.append(PasswordEntry(self.w))
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def _return_values(self):
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return [self.entries[0].value, self.entries[1].value]
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class BookForm(FormWindow):
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caption = "Add a Book"
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blabel = "Add"
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labels = ["ISBN", "LCCN", "Title", "Subtitle", "Authors", "Edition",
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"Publisher", "Publish Date", "Publish Year", "Publish Month", "Publish location",
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"Pages", "Pagination", "Weight"]
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# redefineable functions lookup is called when 'enter' is pressed on ISBN
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# and returns the looked-up book. Default returns nothing
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def lookup_isbn(self,isbn):
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return {'isbn':isbn}
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def lookup_lccn(self,lccn):
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return {'lccn':lccn}
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def return_book(self):
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return self._return_values()
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def handle_input(self,ch):
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if ch==10 or ch==curses.KEY_ENTER:
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if self.hl==0: # lookup by isbn
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book = self.lookup_isbn(self.entries[0].value)
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if book != {}:
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self._set_entries(book)
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self.refresh()
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self._mv_focus(+12)
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if self.hl==1: # lookup by lccn
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book = self.lookup_lccn(self.entries[1].value)
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if book != {}:
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self._set_entries(book)
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self.refresh()
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self._mv_focus(+11)
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else:
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FormWindow.handle_input(self,ch)
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class BookView(BookForm):
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blabel = "Done"
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buttononly = True
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labels = ["ISBN", "LCCN", "Title", "Subtitle", "Authors", "Edition",
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"Publisher", "Publish Date", "Publish Year", "Publish Month", "Publish location",
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"Pages", "Pagination", "Weight", "Categories", "Status"]
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def __init__(self, window, helpbar, book, width=50):
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book = copy(book)
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book["categories"] = " - ".join([cat["category"] for cat in db.getBookCategories(book)])
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status = db.get_checkout_status(book["id"])
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if status:
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book["status"] = "Checked out by %s (%s)" % (status["uwid"], status["date_out"])
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else:
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book["status"] = "On shelf"
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self.caption = "Viewing Book " + str(book["id"])
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super().__init__(window, helpbar, book, width)
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class CategoryForm(FormWindow):
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caption = "Add a Category"
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blabel = "Add"
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labels = ["Category"]
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def _return_values(self):
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return self.entries[0].value
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class ErrorForm(FormWindow):
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caption = "Error"
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blabel = "OK"
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buttononly = True
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def __init__(self,window,helpbar,errortext,width=50):
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self.labels = errortext.split("\n")
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super().__init__(window, helpbar, width=width)
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def redraw(self):
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self.w.box()
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self.w.addstr(0,(self.mx-len(self.caption))//2,self.caption)
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r=0
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for l in self.labels:
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c = 2
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self.w.addstr(r+self.top,c,l)
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r+=1
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self.w.addstr(self.brow,self.bcol[1], "<"+self.blabel+">")
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self.w.chgat(self.brow, self.bcol[1], len(self.blabel)+2, curses.A_REVERSE)
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self.w.refresh()
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def _mv_focus(self,delta): pass
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def error_form(text, w, hb):
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width = max([len(l) for l in text.split("\n")]) + 4
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child=curses.newwin(1,1)
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f = ErrorForm(child, hb, text, width)
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(my,mx)=w.getmaxyx()
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(r,c)=child.getmaxyx()
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child.mvwin((my-r)//2,(mx-c)//2)
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w.refresh()
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f.event_loop()
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f.clear()
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def catch_error_with(getwhb):
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def decorator(fn):
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def wrapper_fun(*args, **kwd):
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try:
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return fn(*args, **kwd)
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except LibrarianException as e:
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w, hb, cleanup = getwhb(*args, **kwd)
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error_form(str(e), w, hb)
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if cleanup: cleanup()
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return wrapper_fun
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return decorator
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catch_error = catch_error_with(lambda self, *args, **kwd : (self.w, self.hb, self.refresh))
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