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@jsbain jsbain/ZoomView.py
Created Nov 25, 2014

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ZoomView.py
import ui
class Touch(object):
''' writable version of ui.Touch'''
def __init__(self,touch):
self.location=touch.location
self.touch_id=touch.touch_id
self.phase=touch.phase
self.prev_location=touch.prev_location
self.timestamp=touch.timestamp
class ZoomView(ui.View):
'''view which is pinch zoomable and draggable.'''
def __init__(self):
self.touches={}
self.multitouch_enabled=True
self.bg_color='white'
self.border=20
def fix_touch(self,touch):
'''convert to root coords. i think this doesnt quite work, '''
t=Touch(touch)
t.location=ui.convert_point(t.location,self,self.superview)
t.prev_location=ui.convert_point(t.prev_location,self,self.superview)
return t
def touch_began(self,touch):
'''keep track of touches'''
self.touches[touch.touch_id]=self.fix_touch(touch)
if len(self.touches.keys())==2:
self.set_needs_display()
self.bring_to_front()
t0=self.touches.values()[0]
t1=self.touches.values()[1]
self.orig_frame=self.frame
self.orig_touchdiff=[abs(t0.location[axis]-t1.location[axis]) for axis in range(0,2)]
self.orig_touchavg=[abs(t0.location[axis]/2.0+t1.location[axis]/2.0) for axis in range(0,2)]
self.orig_border=self.border_color
self.border_color=(0.00, 0.50, 1.00)
self.border_width= self.border_width+3
def touch_moved(self,touch):
'''update touch, then determine change in pos, height and width'''
prevtouch=self.touches[touch.touch_id]
self.touches[touch.touch_id]=self.fix_touch(touch)
self.touches[touch.touch_id].prev_location=prevtouch.location
if len(self.touches.keys())==2:
t0=self.touches.values()[0]
t1=self.touches.values()[1]
diffpos=[abs(t0.location[axis]-t1.location[axis]) for axis in range(0,2)]
dw,dh=[diffpos[x]-self.orig_touchdiff[x] for x in (0,1)]
avgpos=[t0.location[axis]/2.0+t1.location[axis]/2.0 for axis in range(0,2)]
dx,dy=[avgpos[x]-self.orig_touchavg[x] for x in (0,1)]
#compute new frame
f=list(self.orig_frame)
f[0]=f[0]-dw/2.0+dx
f[1]=f[1]-dh/2.0+dy
f[2]=max(f[2]+dw,self.border*2+1)
f[3]=max(f[3]+dh,self.border*2+1)
self.frame=tuple(f)
self.set_needs_display()
def touch_ended(self,touch):
'''clean up unused touch'''
del(self.touches[touch.touch_id])
if len(self.touches.keys())==1:
self.border_color=self.orig_border
self.border_width=self.border_width-3
self.set_needs_display()
def layout():
'''override to do more complex layout when resizing'''
pass
if __name__=='__main__':
import random
from functools import partial
def create_new_window(root,sender):
v=ZoomView()
v.bg_color=0.90, 0.90, 0.90
v.border_color='grey'
v.border_width=2
v.x=random.randrange(75,300)
v.y=random.randrange(75,300)
v.width=v.height=300
closebutton=ui.Button(frame=(250,0,50,50), bg_color='grey')
closebutton.image=ui.Image.named('ionicons-close-round-32')
closebutton.flex='bl'
def closeview(sender):
sender.superview.superview.remove_subview(sender.superview)
closebutton.action=closeview
tv=ui.TextView()
tv.frame=(20,20,258,258)
tv.flex='wh'
v.add_subview(tv)
v.add_subview(closebutton)
root.add_subview(v)
root=ui.View(bg_color=(0.00, 0.00, 0.50))
new_button=ui.Button(title='+new window',bg_color=(0.80, 0.80, 0.80),frame=(0,0,75,75))
new_button.action=partial(create_new_window,root)
root.add_subview(new_button)
root.present()
# v=ZoomView()
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