#
# Tkinter 3000
#
# this demo implements a simple text list widget, and shows
# how to make it scrollable
#

from WCK import Widget, ScrollMixin, TextMixin, FONT, FOREGROUND

import string

class ScrollableText(ScrollMixin, TextMixin, Widget):

    ui_option_height = 24
    ui_option_width = 80

    ui_option_yscrollcommand = None # enables vertical scrolling

    def __init__(self, master, **options):
        self.data = []
        self.top = 0
        self.visible = 0
        self.ui_init(master, options)

    #
    # ScrollMixin interface

    def ui_scroll_yinfo(self):
        # return total, top, bottom
        return len(self.data), self.top, self.top + self.visible - 1

    def ui_scroll_yset(self, top, units=0, pages=0):
        # change top offset
        top = top + units + pages * self.visible
        total = len(self.data)
        top = max(0, min(top, total - self.visible + 1))
        if top != self.top:
            self.ui_damage()
            self.top = top
        self.ui_scroll_update()

    def ui_handle_resize(self, width, height):
        self.visible = int(height / self.ui_draw.textsize(None, self.font)[1])
        self.ui_scroll_yset(self.top) # update scrollbar

    def ui_handle_repair(self, draw, x0, y0, x1, y1):
        width, height = draw.textsize(None, self.font)
        y = 0
        for i in range(self.top, len(self.data)):
            if y >= y1:
                break
            draw.text((0, y), string.rstrip(str(self.data[i])), self.font)
            y = y + height

    #
    # public api

    def getdata(self):
        return self.data

    def setdata(self, data, top=None):
        if top is None:
            top = self.top
        self.data = data
        self.ui_scroll_yset(top)
        self.ui_damage() # redraw me

if __name__ == "__main__":

    import Tkinter

    root = Tkinter.Tk()
    root.title("demoScrolledText")

    scrollbar = Tkinter.Scrollbar(root)
    scrollbar.pack(side="right", fill="y")

    widget = ScrollableText(root, font="courier 8", background="white",
                            yscrollcommand=scrollbar.set)
    widget.pack(fill="both", expand=1)

    scrollbar.config(command=widget.yview)

    import sys
    widget.setdata(open(sys.argv[0]).readlines())

    root.mainloop()