allow user to select media image subsection using the mouse

svn: r11140
This commit is contained in:
Stéphane Charette 2008-10-12 09:39:11 +00:00
parent 77707348ee
commit fd20371245

View File

@ -117,9 +117,17 @@ class EditMediaRef(EditReference):
self.top.get_widget("type").set_text("")
def _setup_fields(self):
ebox = self.top.get_widget('eventbox')
ebox.connect('button-press-event', self.button_press_event)
ebox_shared = self.top.get_widget('eventbox')
ebox_shared.connect('button-press-event', self.button_press_event)
if not self.dbstate.db.readonly:
self.button_press_coords = (0, 0)
ebox_ref = self.top.get_widget('eventbox1')
ebox_ref.connect('button-press-event', self.button_press_event_ref)
ebox_ref.connect('button-release-event', self.button_release_event_ref)
ebox_ref.add_events(gtk.gdk.BUTTON_PRESS_MASK)
ebox_ref.add_events(gtk.gdk.BUTTON_RELEASE_MASK)
self.pixmap = self.top.get_widget("pixmap")
coord = self.source_ref.get_rectangle()
@ -381,6 +389,94 @@ class EditMediaRef(EditReference):
if event.button==1 and event.type == gtk.gdk._2BUTTON_PRESS:
self.view_media(obj)
def button_press_event_ref(self, widget, event):
"""
Handle the button-press-event generated by the eventbox
parent of the subpixmap. Remember these coordinates
so we can crop the picture when button-release-event
is received.
"""
self.button_press_coords = (event.x, event.y)
def button_release_event_ref(self, widget, event):
"""
Handle the button-release-event generated by the eventbox
parent of the subpixmap. Crop the picture accordingly.
"""
# reset the crop on double-click or click+CTRL
if (event.button==1 and event.type == gtk.gdk._2BUTTON_PRESS) or \
(event.button==1 and (event.state & gtk.gdk.CONTROL_MASK) ):
self.corner1_x_spinbutton.set_value(0)
self.corner1_y_spinbutton.set_value(0)
self.corner2_x_spinbutton.set_value(100)
self.corner2_y_spinbutton.set_value(100)
else:
# ensure the clicks happened at least 5 pixels away from each other
new_x1 = min(self.button_press_coords[0], event.x)
new_y1 = min(self.button_press_coords[1], event.y)
new_x2 = max(self.button_press_coords[0], event.x)
new_y2 = max(self.button_press_coords[1], event.y)
if new_x2 - new_x1 >= 5 and new_y2 - new_y1 >= 5:
# get the image size and calculate the X and Y offsets
# (image is centered when smaller than const.THUMBSCALE)
pixbuf = self.subpixmap.get_pixbuf();
w = pixbuf.get_width()
h = pixbuf.get_height()
x = (const.THUMBSCALE - w) / 2
y = (const.THUMBSCALE - h) / 2
# if the click was outside of the image,
# bring it within the boundaries
if new_x1 < x:
new_x1 = x
if new_y1 < y:
new_y1 = y
if new_x2 >= x + w:
new_x2 = x + w - 1
if new_y2 >= y + h:
new_y2 = y + h - 1
# get the old spinbutton % values
old_x1 = self.corner1_x_spinbutton.get_value()
old_y1 = self.corner1_y_spinbutton.get_value()
old_x2 = self.corner2_x_spinbutton.get_value()
old_y2 = self.corner2_y_spinbutton.get_value()
delta_x = old_x2 - old_x1 # horizontal scale
delta_y = old_y2 - old_y1 # vertical scale
# Took a while to figure out the math here.
#
# 1) figure out the current crop % values
# by doing the following:
#
# xp = click_location_x / width * 100
# yp = click_location_y / height * 100
#
# but remember that click_location_x and _y
# might not be zero-based for non-rectangular
# images, so subtract the pixbuf "x" and "y"
# to bring the values back to zero-based
#
# 2) the minimum value cannot be less than the
# existing crop value, so add the current
# minimum to the new values
new_x1 = old_x1 + delta_x * (new_x1 - x) / w
new_y1 = old_y1 + delta_y * (new_y1 - y) / h
new_x2 = old_x1 + delta_x * (new_x2 - x) / w
new_y2 = old_y1 + delta_y * (new_y2 - y) / h
# set the new values
self.corner1_x_spinbutton.set_value(new_x1)
self.corner1_y_spinbutton.set_value(new_y1)
self.corner2_x_spinbutton.set_value(new_x2)
self.corner2_y_spinbutton.set_value(new_y2)
def _update_addmedia(self, obj):
"""
Called when the add media dialog has been called.