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Implement a "poor man's" zoom feature. (The image gets bigger and smaller

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as expected, but the window size increases when zooming in, rather than
there being a scrollable window.  Not perfect, but far better than nothing.)
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Jim Diamond 2024-05-10 16:00:30 -03:00
parent 468b82aae8
commit 8e736f9dee
1 changed files with 50 additions and 0 deletions
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50
cropgtk.py
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@ -140,6 +140,51 @@ class DragManager(DragManagerBase):
self.result = -1
self.loop.quit()
# This does zoom in, in the sense that the GTK window gets twice as big.
# What I really want to do is to either
# (a) crop the thumbnail but map the coords back to the original image;
# (b) show the image in a scrolled window (see, for example,
# Gtk.ScrolledWindow); or
# (c) see if I can define a viewport to display just the uncropped part
# of the image.
# But this is still useful, in that
# (a) in some cases the initial zoom factor could be bigger and still fit, and
# (b) the user can move the overly-large window around using the window manager
# to get at any edge.
# TODO: although the GUI window automagically increases in size when
# zoom("in") is called, the window doesn't shrink on zoom("out").
# This should probably be fixed.
# TODO: it is possible the original image has disappeared. Open in try/except block.
def zoom(self, in_out):
if in_out == "in":
if self.scale > 1:
new_scale = self.scale // 2;
else:
return
else:
new_scale = self.scale * 2;
# These values get reset below; save and restore them explicitly.
t, l, r, b = self.top, self.left, self.right, self.bottom
# In tests, using a copy of the original saved in run() just didn't work
# for (at least) rotated images. So re-open the file.
image = self.copy_of_original
# Must reset .w and .h since those may have been "rotated".
self.w, self.h = image.size
thumbnail = image.copy()
thumbnail.thumbnail((self.w // new_scale, self.h // new_scale))
self.image = thumbnail
self.rotation = 1
rotation = self.original_rotation
if rotation in (3,6,8):
while self.rotation != rotation:
self.rotate_ccw()
self.scale = new_scale
self.set_crop(t, l, r, b)
# TODO: should the coords be limited to [min..max] here or in set_crop?
def key(self, w, e):
if e.keyval == gdk.KEY_Escape: self.escape()
elif e.keyval == gdk.KEY_Return: self.done()
@ -162,6 +207,8 @@ class DragManager(DragManagerBase):
elif e.string in 'J': self.set_crop(self.top, self.left, self.right, min(self.h, self.bottom + b_delta))
elif e.string in 'K': self.set_crop(self.top, self.left, self.right, max(0, self.bottom - b_delta))
elif e.string in 'L': self.set_crop(self.top, self.left, min(self.w, self.right + r_delta), self.bottom)
elif e.string == 'z': self.zoom("in")
elif e.string == 'Z': self.zoom("out")
# Don't know whether other event handlers need it too, but if
# this doesn't return True (True prevents further handlers from
@ -234,6 +281,7 @@ class DragManager(DragManagerBase):
return self.result
display = gdk.Display().get_default()
# TODO: get the monitor where the mouse is, not necessarily #0.
wa = display.get_monitor(0).get_workarea()
max_h = wa.height - 192
max_w = wa.width - 64
@ -285,6 +333,7 @@ class App:
self.set_busy()
try:
image = Image.open(image_name)
drag.copy_of_original = image.copy() # Needed by zoom()
drag.round_x, drag.round_y = image_round(image)
drag.w, drag.h = image.size
scale = 1
@ -305,6 +354,7 @@ class App:
drag.image = thumbnail
drag.rotation = 1
rotation = image_rotation(image)
drag.original_rotation = rotation # Needed by zoom()
if rotation in (3,6,8):
while drag.rotation != rotation:
drag.rotate_ccw()