Hi.
I am writing a program that user can drag a layout up and down.
But there are two questions in the way:
1.When you are dragging upwards,the portion that was invisible at the
beginning, that is,those below the window's border, will never show up.
I tried to add some line(see the code below) in the self.moveCB().But it
seems not to work.
2.If you move or resize the window manually,the layout would simply discard
all the scrolling made before.
Adding some code to scroll back wouldn't work.
Best regards
Code:
import gtk
class Example:
def __init__(self):
window = gtk.Window()
self.window = window
window.connect("destroy", lambda w: gtk.main_quit())
window.set_default_size(400, 400)
window.connect("configure-event", self.configureCB)
vbox = gtk.VBox()
self.vbox = vbox
vbox.set_homogeneous(True)
vbox.set_spacing(5)
for i in range(1,20):
label = gtk.Label("Hello,there" + '1'*i)
vbox.pack_start(label)
layout = gtk.Layout()
self.layout = layout
layout.put(vbox, 0, 0)
layout.add_events(gtk.gdk.BUTTON_RELEASE_MASK |
gtk.gdk.BUTTON1_MOTION_MASK | gtk.gdk.POINTER_MOTION_HINT_MASK)
layout.connect("button-press-event", self.pressCB)
layout.connect("motion-notify-event", self.moveCB)
layout.connect("button-release-event", self.releaseCB)
self.dragging = False #is dragging
self.dragBeginPos = [0, 0]
self.yPos = 0 #remember vertical scrolling position
window.add(layout)
window.show_all()
layout.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.HAND1))
def pressCB(self, widget, event):
self.dragBeginPos = [event.x, event.y]
self.dragging = True
return True
def moveCB(self, widget, event):
if(self.dragging == True):
dy = event.y - self.dragBeginPos[1]
self.layout.get_parent_window().scroll(0, int(dy))
#line added but seems not to work
self.layout.queue_draw()
#line added but seems not to work
self.layout.window.process_updates(True)
self.yPos = self.yPos + dy #update self.yPos
return True
def releaseCB(self, widget, event):
dragging = False
def configureCB(self, widget, event):
size = self.window.get_size()
size = size[0]
size = (size - self.vbox.allocation.width)/2
self.layout.move(self.vbox, size, 0)
self.layout.get_parent_window().scroll(0, int(self.yPos))
if __name__ == "__main__":
Example()
gtk.main()
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