130 lines
3.1 KiB
Python
130 lines
3.1 KiB
Python
# srcwin.py -- a source listing window
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import stdwin
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from stdwinevents import *
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import basewin
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WIDTH = 40
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MAXHEIGHT = 24
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class TextWindow(basewin.BaseWindow):
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def __init__(self, title, contents):
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self.contents = contents
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self.linecount = countlines(self.contents)
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#
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self.lineheight = lh = stdwin.lineheight()
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self.leftmargin = self.getmargin()
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self.top = 0
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self.rightmargin = 30000 # Infinity
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self.bottom = lh * self.linecount
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#
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width = WIDTH*stdwin.textwidth('0')
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height = lh*min(MAXHEIGHT, self.linecount)
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stdwin.setdefwinsize(width, height)
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basewin.BaseWindow.__init__(self, title)
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#
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self.win.setdocsize(0, self.bottom)
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self.initeditor()
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def initeditor(self):
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r = (self.leftmargin, self.top), (self.rightmargin, self.bottom)
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self.editor = self.win.textcreate(r)
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self.editor.settext(self.contents)
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def closeeditor(self):
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self.editor.close()
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# def reopen(self):
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# self.closeeditor()
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# basewin.BaseWindow.reopen(self)
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# self.initeditor()
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# Override the following two methods to format line numbers differently
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def getmark(self, lineno):
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return `lineno`
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def getmargin(self):
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return stdwin.textwidth(`self.linecount + 1` + ' ')
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# Event dispatcher, called from mainloop.mainloop()
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def dispatch(self, event):
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if event[0] == WE_NULL: return # Dummy tested by mainloop
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if event[0] == WE_DRAW or not self.editor.event(event):
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basewin.BaseWindow.dispatch(self, event)
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# Event handlers
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def close(self):
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self.closeeditor()
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basewin.BaseWindow.close(self)
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def draw(self, detail):
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dummy = self.editor.draw(detail)
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# Draw line numbers
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(left, top), (right, bottom) = detail
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topline = top/self.lineheight
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botline = bottom/self.lineheight + 1
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botline = min(self.linecount, botline)
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d = self.win.begindrawing()
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try:
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h, v = 0, self.lineheight * topline
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for lineno in range(topline+1, botline+1):
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d.text((h, v), self.getmark(lineno))
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v = v + self.lineheight
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finally:
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d.close()
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# Calls from outside
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def changemark(self, lineno): # redraw the mark for a line
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left = 0
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top = (lineno-1) * self.lineheight
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right = self.leftmargin
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bottom = lineno * self.lineheight
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d = self.win.begindrawing()
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try:
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d.erase((left, top), (right, bottom))
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d.text((left, top), self.getmark(lineno))
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finally:
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d.close()
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def showline(self, lineno): # scroll to make a line visible
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left = 0
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top = (lineno-1) * self.lineheight
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right = self.leftmargin
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bottom = lineno * self.lineheight
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self.win.show((left, top), (right, bottom))
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# Subroutine to count the number of lines in a string
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def countlines(text):
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n = 0
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for c in text:
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if c == '\n': n = n+1
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if text and text[-1] != '\n': n = n+1 # Partial last line
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return n
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class SourceWindow(TextWindow):
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def __init__(self, filename):
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self.filename = filename
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f = open(self.filename, 'r')
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contents = f.read()
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f.close()
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TextWindow.__init__(self, self.filename, contents)
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# ------------------------------ testing ------------------------------
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TESTFILE = 'srcwin.py'
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def test():
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import mainloop
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sw = SourceWindow(TESTFILE)
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mainloop.mainloop()
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