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Mouse scroll wheel! New PDF viewer demo

This commit is contained in:
MikeTheWatchGuy 2018-08-20 23:45:09 -04:00
parent c482dee57e
commit 240a0a71e4
2 changed files with 174 additions and 59 deletions
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220
Demo_PDF_Viewer.py
View File

@ -1,79 +1,183 @@
"""
@created: 2018-08-19 18:00:00
@author: (c) 2018 Jorj X. McKie
Display a PyMuPDF Document using Tkinter
-------------------------------------------------------------------------------
Dependencies:
-------------
PyMuPDF, PySimpleGUI > v2.9.0, Tkinter with Tk v8.6+, Python 3
License:
--------
GNU GPL V3+
Description
------------
Read filename from command line and start display with page 1.
Pages can be directly jumped to, or buttons for paging can be used.
For experimental / demonstration purposes, we have included options to zoom
into the four page quadrants (top-left, bottom-right, etc.).
We also interpret keyboard events to support paging by PageDown / PageUp
keys as if the resp. buttons were clicked. Similarly, we do not include
a 'Quit' button. Instead, the ESCAPE key can be used, or cancelling the form.
To improve paging performance, we are not directly creating pixmaps from
pages, but instead from the fitz.DisplayList of the page. A display list
will be stored in a list and looked up by page number. This way, zooming
pixmaps and page re-visits will re-use a once-created display list.
"""
import sys
import fitz
import PySimpleGUI as sg
from binascii import hexlify
try:
if len(sys.argv) == 1:
rc, fname = sg.GetFileBox('PDF Browser', 'PDF file to open', file_types=(("PDF Files", "*.pdf"),))
if rc is False:
sg.MsgBoxCancel('Cancelling')
exit(0)
else:
fname = sys.argv[1]
except:
fname = 'C:/Python/PycharmProjects/GooeyGUI/test.pdf'
doc = fitz.open(fname)
title = "PyMuPDF display of '%s' (%i pages)" % (fname, len(doc))
page_count = len(doc)
def get_page(pno, zoom = 0):
page = doc[pno]
r = page.rect
mp = r.tl + (r.br - r.tl) * 0.5
mt = r.tl + (r.tr - r.tl) * 0.5
ml = r.tl + (r.bl - r.tl) * 0.5
mr = r.tr + (r.br - r.tr) * 0.5
mb = r.bl + (r.br - r.bl) * 0.5
mat = fitz.Matrix(2, 2)
if zoom == 1:
# storage for page display lists
dlist_tab = [None] * page_count
title = "PyMuPDF display of '%s', pages: %i" % (fname, page_count)
def get_page(pno, zoom=0):
"""Return a PNG image for a document page number. If zoom is other than 0, one of the 4 page quadrants are zoomed-in instead and the corresponding clip returned.
"""
dlist = dlist_tab[pno] # get display list
if not dlist: # create if not yet there
dlist_tab[pno] = doc[pno].getDisplayList()
dlist = dlist_tab[pno]
r = dlist.rect # page rectangle
mp = r.tl + (r.br - r.tl) * 0.5 # rect middle point
mt = r.tl + (r.tr - r.tl) * 0.5 # middle of top edge
ml = r.tl + (r.bl - r.tl) * 0.5 # middle of left edge
mr = r.tr + (r.br - r.tr) * 0.5 # middle of right egde
mb = r.bl + (r.br - r.bl) * 0.5 # middle of bottom edge
mat = fitz.Matrix(2, 2) # zoom matrix
if zoom == 1: # top-left quadrant
clip = fitz.Rect(r.tl, mp)
elif zoom == 4:
elif zoom == 4: # bot-right quadrant
clip = fitz.Rect(mp, r.br)
elif zoom == 2:
elif zoom == 2: # top-right
clip = fitz.Rect(mt, mr)
elif zoom == 3:
elif zoom == 3: # bot-left
clip = fitz.Rect(ml, mb)
if zoom == 0:
pix = page.getPixmap(alpha = False)
if zoom == 0: # total page
pix = dlist.getPixmap(alpha=False)
else:
pix = page.getPixmap(alpha = False, matrix = mat, clip = clip)
return pix.getPNGData()
pix = dlist.getPixmap(alpha=False, matrix=mat, clip=clip)
return pix.getPNGData() # return the PNG image
form = sg.FlexForm(title, return_keyboard_events=True)
data = get_page(0)
form = sg.FlexForm(title, return_keyboard_events=True, use_default_focus=False)
cur_page = 0
data = get_page(cur_page) # show page 1 for start
image_elem = sg.Image(data=data)
layout = [ [image_elem],
[sg.ReadFormButton('Next'),
sg.ReadFormButton('Prev'),
sg.ReadFormButton('First'),
sg.ReadFormButton('Last'),
sg.ReadFormButton('Zoom-1'),
sg.ReadFormButton('Zoom-2'),
sg.ReadFormButton('Zoom-3'),
sg.ReadFormButton('Zoom-4'),
sg.Quit()] ]
goto = sg.InputText(str(cur_page + 1), size=(5, 1), do_not_clear=True)
layout = [
[
sg.ReadFormButton('Next'),
sg.ReadFormButton('Prev'),
sg.Text('Page:'),
goto,
],
[
sg.Text("Zoom:"),
sg.ReadFormButton('Top-L'),
sg.ReadFormButton('Top-R'),
sg.ReadFormButton('Bot-L'),
sg.ReadFormButton('Bot-R'),
],
[image_elem],
]
form.Layout(layout)
my_keys = ("Next", "Next:34", "Prev", "Prior:33", "Top-L", "Top-R",
"Bot-L", "Bot-R", "MouseWheel:Down", "MouseWheel:Up")
zoom_buttons = ("Top-L", "Top-R", "Bot-L", "Bot-R")
old_page = 0
old_zoom = 0 # used for zoom on/off
# the zoom buttons work in on/off mode.
i = oldzoom = 0
while True:
button,value = form.Read()
button, value = form.ReadNonBlocking()
zoom = 0
if button in (None, 'Quit'):
force_page = False
if button is None and value is None:
break
if button in ("Next", 'Next:34'):
i += 1
elif button in ("Prev", "Prior:33"):
i -= 1
elif button == "First":
i = 0
elif button == "Last":
i = -1
elif button == "Zoom-1":
zoom = oldzoom = 0 if oldzoom == 1 else 1
elif button == "Zoom-2":
zoom = oldzoom = 0 if oldzoom == 2 else 2
elif button == "Zoom-3":
zoom = oldzoom = 0 if oldzoom == 3 else 3
elif button == "Zoom-4":
zoom = oldzoom = 0 if oldzoom == 4 else 4
try:
data = get_page(i, zoom)
except:
i = 0
data = get_page(i, zoom)
image_elem.Update(data=data)
if button is None:
continue
if button in ("Escape:27"): # this spares me a 'Quit' button!
break
# print("hex(button)", hexlify(button.encode()))
if button[0] == chr(13): # surprise: this is 'Enter'!
try:
cur_page = int(value[0]) - 1 # check if valid
while cur_page < 0:
cur_page += page_count
except:
cur_page = 0 # this guy's trying to fool me
goto.Update(str(cur_page + 1))
# goto.TKStringVar.set(str(cur_page + 1))
elif button in ("Next", "Next:34", "MouseWheel:Down"):
cur_page += 1
elif button in ("Prev", "Prior:33", "MouseWheel:Up"):
cur_page -= 1
elif button == "Top-L":
zoom = 1
elif button == "Top-R":
zoom = 2
elif button == "Bot-L":
zoom = 3
elif button == "Bot-R":
zoom = 4
# sanitize page number
if cur_page >= page_count: # wrap around
cur_page = 0
while cur_page < 0: # we show conventional page numbers
cur_page += page_count
# prevent creating same data again
if cur_page != old_page:
zoom = old_zoom = 0
force_page = True
if button in zoom_buttons:
if 0 < zoom == old_zoom:
zoom = 0
force_page = True
if zoom != old_zoom:
force_page = True
if force_page:
data = get_page(cur_page, zoom)
image_elem.Update(data=data)
old_page = cur_page
old_zoom = zoom
# update page number field
if button in my_keys or not value[0]:
goto.Update(str(cur_page + 1))
# goto.TKStringVar.set(str(cur_page + 1))

13
PySimpleGUI.py
View File

@ -1027,7 +1027,6 @@ class FlexForm:
return BuildResults(self, False, self)
def KeyboardCallback(self, event ):
# print(".",)
self.LastButtonClicked = None
self.FormRemainedOpen = True
if event.char != '':
@ -1038,6 +1037,16 @@ class FlexForm:
results = BuildResults(self, False, self)
self.TKroot.quit()
def MouseWheelCallback(self, event ):
self.LastButtonClicked = None
self.FormRemainedOpen = True
# print(ObjToStringSingleObj(event))
direction = 'Down' if event.delta < 0 else 'Up'
self.LastKeyboardEvent = 'MouseWheel:' + direction
if not self.NonBlocking:
results = BuildResults(self, False, self)
self.TKroot.quit()
def _Close(self):
try:
@ -1796,8 +1805,10 @@ def StartupTK(my_flex_form):
my_flex_form.SetIcon(my_flex_form.WindowIcon)
if my_flex_form.ReturnKeyboardEvents and not my_flex_form.NonBlocking:
root.bind("<KeyRelease>", my_flex_form.KeyboardCallback)
root.bind("<MouseWheel>", my_flex_form.MouseWheelCallback)
elif my_flex_form.ReturnKeyboardEvents:
root.bind("<Key>", my_flex_form.KeyboardCallback)
root.bind("<MouseWheel>", my_flex_form.MouseWheelCallback)
if my_flex_form.AutoClose:
duration = DEFAULT_AUTOCLOSE_TIME if my_flex_form.AutoCloseDuration is None else my_flex_form.AutoCloseDuration