From 9b190f5cee6dff31eb7682b297eaf25440ec3deb Mon Sep 17 00:00:00 2001
From: MikeTheWatchGuy <mike_barnett@hotmail.com>
Date: Mon, 20 Aug 2018 18:43:33 -0400
Subject: [PATCH] Added page-up / page-down

---
 Demo_PDF_Viewer.py | 92 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Demo_PDF_Viewer.py

diff --git a/Demo_PDF_Viewer.py b/Demo_PDF_Viewer.py
new file mode 100644
index 00000000..1e933ef8
--- /dev/null
+++ b/Demo_PDF_Viewer.py
@@ -0,0 +1,92 @@
+import sys
+import fitz
+import PySimpleGUI as sg
+
+try:
+    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))
+
+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:
+        clip = fitz.Rect(r.tl, mp)
+    elif zoom == 4:
+        clip = fitz.Rect(mp, r.br)
+    elif zoom == 2:
+        clip = fitz.Rect(mt, mr)
+    elif zoom == 3:
+        clip = fitz.Rect(ml, mb)
+    if zoom == 0:
+        pix = page.getPixmap(alpha = False)
+    else:
+        pix = page.getPixmap(alpha = False, matrix = mat, clip = clip)
+    return pix.getPNGData()
+
+form = sg.FlexForm(title, return_keyboard_events=True)
+
+data = get_page(0)
+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()]  ]
+
+form.Layout(layout)
+
+i = 0
+oldzoom = 0
+while True:
+    button,value = form.Read()
+    zoom = 0
+    if button in (None, 'Quit'):
+        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":
+        if oldzoom == 1:
+            zoom = oldzoom = 0
+        else:
+            zoom = oldzoom = 1
+    elif button == "Zoom-2":
+        if oldzoom == 2:
+            zoom = oldzoom = 0
+        else:
+            zoom = oldzoom = 2
+    elif button == "Zoom-3":
+        if oldzoom == 3:
+            zoom = oldzoom = 0
+        else:
+            zoom = oldzoom = 3
+    elif button == "Zoom-4":
+        if oldzoom == 4:
+            zoom = oldzoom = 0
+        else:
+            zoom = oldzoom = 4
+    try:
+        data = get_page(i, zoom)
+    except:
+        i = 0
+        data = get_page(i, zoom)
+    image_elem.Update(data=data)