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    This is the community forum for my apps Pythonista and Editorial.

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    Pure Python gestures

    Pythonista
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    • stephen
      stephen @Anxietier last edited by

      @Anxietier no problem. i looked over the moduleand it looks like all uwould need to do is run a ui.animate transgorm back yto orignal psition.if touch doesnt store the original long enough (it should) you can also store this in a var. should be straight forward butd have to run through this module a bit beore i can give an example.

      Anxietier 1 Reply Last reply Reply Quote 0
      • Anxietier
        Anxietier @stephen last edited by

        @stephen
        yeah, i made a demo, i subclass ui.view, add ui,imageview to show image, and i def a method to fix imageview_size to view_size, include view_center, when i drag down imageview and leave my finger, it can move back to origin pos,
        but, i need an experience, i'd try to describe it:
        '' when i drag it down shortly, imageview would move down follow my finger,
        when my finger drag long way, like from top screen to bottom, the imagview wouldnt follow my finger, feel like dragging a strong
        spring ''
        i try to find a math function to let imageview and fingers' trave non-linear, but i failed, so ... u know :P

        stephen mikael 2 Replies Last reply Reply Quote 0
        • stephen
          stephen @Anxietier last edited by

          @Anxietier πŸ€“ ah math now i can help u. give me a few min to write up a friction/drag method for you

          1 Reply Last reply Reply Quote 0
          • mikael
            mikael @Anxietier last edited by

            @Anxietier, please see below for something you can adjust to your needs.

            I recommend and use scripter, because it makes the animations easy and includes the ease functions.

            import ui
            import scripter
            
            v = ui.View(background_color='black')
            
            class Pulled(ui.View):
                
                straight_pull = 100
                slowing_pull = 100
                
                def touch_began(self, t):
                    self.start_y = ui.convert_point(t.location, from_view=self).y
                    
                def touch_moved(self, t):
                    delta_y = (
                        ui.convert_point(t.location, from_view=self).y - 
                        ui.convert_point(t.prev_location, from_view=self).y)
                    if self.y < self.straight_pull:
                        self.y += delta_y
                        return
                    if self.y < (self.straight_pull + self.slowing_pull):
                        diff = self.y-self.straight_pull
                        diff_fraction = diff/self.slowing_pull
                        effective = 1 - min(1, diff_fraction) ** 2
                        self.y += delta_y * effective
                    
                def touch_ended(self, t):
                    scripter.y(self, 0, ease_func=scripter.ease_out)
            
            v.add_subview(Pulled(
                frame=v.bounds,
                flex='WH',
                background_color='green'))
            
            v.present('fullscreen')
            
            Anxietier 1 Reply Last reply Reply Quote 0
            • Anxietier
              Anxietier @mikael last edited by

              @mikael
              thank you, when i ran ur code, it post me an error:
              scripter.y(self, 0, ease_func=scripter.ease_out)
              module 'scripter' has no attribute 'y'

              then i check scripter.py, i only found the vector_class has a method called y(...)
              im confused~

              Anxietier 1 Reply Last reply Reply Quote 0
              • Anxietier
                Anxietier @Anxietier last edited by

                @Anxietier @mikael
                oh, never mind, i restarted app, now its wording fine :D

                mikael 2 Replies Last reply Reply Quote 0
                • mikael
                  mikael @Anxietier last edited by

                  @Anxietier, and a version with a revealed label and a refresh trigger:

                  import ui
                  import scripter
                  
                  v = ui.View(background_color='black')
                  
                  class Pulled(ui.View):
                      
                      straight_pull = 30
                      slowing_pull = 80
                      
                      def touch_began(self, t):
                          self.start_y = ui.convert_point(t.location, from_view=self).y
                          
                      def touch_moved(self, t):
                          delta_y = (
                              ui.convert_point(t.location, from_view=self).y - 
                              ui.convert_point(t.prev_location, from_view=self).y)
                          if self.y < self.straight_pull:
                              self.y += delta_y
                              return
                          if self.y < (self.straight_pull + self.slowing_pull):
                              diff = self.y-self.straight_pull
                              diff_fraction = diff/self.slowing_pull
                              try:
                                  self.reveal_func(diff_fraction)
                              except AttributeError: pass
                              effective = 1 - min(1, diff_fraction) ** 2
                              self.y += delta_y * effective
                              
                          
                      def touch_ended(self, t):
                          scripter.y(self, 0, ease_func=scripter.ease_out)
                          try:
                              self.reveal_func(0)
                          except AttributeError: pass
                          if self.y > self.straight_pull:
                              self.trigger_func()
                  
                  label = ui.Label(text='Release to refresh',
                      text_color='white',
                      flex='LBR',
                      alpha=0,
                  )
                  label.size_to_fit()
                  label.center = v.bounds.center()
                  label.y = 8
                  v.add_subview(label)
                  
                  def reveal(fraction):
                      label.alpha = fraction
                      
                  def trigger():
                      scripter.hide(label)
                      print('refresh')
                  
                  v.add_subview(Pulled(
                      reveal_func=reveal,
                      trigger_func=trigger,
                      frame=v.bounds,
                      flex='WH',
                      background_color='green'))
                  
                  v.present('fullscreen')
                  
                  Anxietier 1 Reply Last reply Reply Quote 0
                  • mikael
                    mikael @Anxietier last edited by

                    @Anxietier, oh, you can throw away the touch_began method, it’s from an earlier version.

                    Anxietier 1 Reply Last reply Reply Quote 0
                    • Anxietier
                      Anxietier @mikael last edited by

                      @mikael thank you
                      and if i want to bind it with gestures, what should i do
                      i mean is there any conflict between gestures and touch
                      what i want to make is, i can use twin fingers to zoom and move picture(imageview or subclass zoompanview, later is better i guess), and when i move picture, move space and scale would be limited, as i leave my fingers, picture's edge should be forced move to superview's edge

                      1 Reply Last reply Reply Quote 0
                      • Anxietier
                        Anxietier @mikael last edited by

                        @mikael ah, dont bother
                        i didnt read doc carefully(perhaps wrong word :P), now i can bind them together, thanks for ur help, ur codes are really amazing and helpful :D

                        mikael stephen 2 Replies Last reply Reply Quote 0
                        • mikael
                          mikael @Anxietier last edited by

                          @Anxietier, little optimization of the ”feel” and code simplification.

                          import ui
                          import scripter
                          
                          v = ui.View(background_color='black')
                          
                          class Pulled(ui.View):
                              
                              trigger_distance = 30
                              pull_distance = 80
                              
                              def touch_moved(self, t):
                                  delta_y = (
                                      ui.convert_point(t.location, from_view=self).y - 
                                      ui.convert_point(t.prev_location, from_view=self).y)
                                  diff_fraction = self.y/self.pull_distance
                                  try:
                                      self.reveal_func(diff_fraction)
                                  except AttributeError: pass
                                  self.y += delta_y * (1 - min(0.9, diff_fraction) ** 2)
                                  self.y = max(0, self.y)
                                  
                              def touch_ended(self, t):
                                  scripter.y(self, 0, ease_func=scripter.ease_out)
                                  try:
                                      self.reveal_func(0)
                                  except AttributeError: pass
                                  if self.y > self.trigger_distance:
                                      self.trigger_func()
                          
                          label = ui.Label(text='Release to refresh',
                              text_color='white',
                              flex='LBR',
                              alpha=0,
                          )
                          label.size_to_fit()
                          label.center = v.bounds.center()
                          label.y = 8
                          v.add_subview(label)
                          
                          def reveal(fraction):
                              label.alpha = fraction
                              
                          def trigger():
                              scripter.hide(label)
                              print('refresh')
                          
                          v.add_subview(Pulled(
                              reveal_func=reveal,
                              trigger_func=trigger,
                              frame=v.bounds,
                              flex='WH',
                              background_color='green'))
                          
                          v.present('fullscreen')
                          
                          Anxietier 1 Reply Last reply Reply Quote 1
                          • stephen
                            stephen @Anxietier last edited by stephen

                            !!! Removed by poster to not confuse future readers with incorrect Code Examples.. πŸ€“πŸ˜‰

                            Anxietier 1 Reply Last reply Reply Quote 0
                            • Anxietier
                              Anxietier @mikael last edited by

                              @mikael
                              thanks for help, i make it
                              but there's another problem showed up:
                              i make a main view, then i subclass zoomPanView and add to mainView , after that i add imageView as zoomPanView's subVIew, like what zoomPanDemo did, when i overwrite on_pan method and test it, data.began and data.changed can give me right value, but data.ended not, i dont know why

                              Anxietier 1 Reply Last reply Reply Quote 0
                              • Anxietier
                                Anxietier @stephen last edited by

                                @stephen thanks for help!
                                im would try to understand ur code, im not good in math though :(
                                btw, i tried mikael's code, and it works fine to me :P

                                1 Reply Last reply Reply Quote 0
                                • Anxietier
                                  Anxietier @Anxietier last edited by

                                  @Anxietier said:

                                  @mikael
                                  thanks for help, i make it
                                  but there's another problem showed up:
                                  i make a main view, then i subclass zoomPanView and add to mainView , after that i add imageView as zoomPanView's subVIew, like what zoomPanDemo did, when i overwrite on_pan method and test it, data.began and data.changed can give me right value, but data.ended not, i dont know why

                                  one more thing, i overwrote on_pinch too, and i printed data.ended, and got right value, maybe two gesture's ended flag conflict ?

                                  mikael Anxietier 2 Replies Last reply Reply Quote 0
                                  • mikael
                                    mikael @Anxietier last edited by

                                    @Anxietier, thanks for catching this. Pan end event was not properly handled, fixed now in the version on the repo.

                                    Anxietier 1 Reply Last reply Reply Quote 0
                                    • Anxietier
                                      Anxietier @Anxietier last edited by

                                      @Anxietier said:

                                      @Anxietier said:

                                      @mikael
                                      thanks for help, i make it
                                      but there's another problem showed up:
                                      i make a main view, then i subclass zoomPanView and add to mainView , after that i add imageView as zoomPanView's subVIew, like what zoomPanDemo did, when i overwrite on_pan method and test it, data.began and data.changed can give me right value, but data.ended not, i dont know why

                                      one more thing, i overwrote on_pinch too, and i printed data.ended, and got right value, maybe two gesture's ended flag conflict ?

                                      i resolved this issue
                                      i subclass both view and GestureMixin as new ZoomPanView, then i overwrite touch_ended, so that when i subclass new ZoomPanView i can edit touch_ended,
                                      high encapsulation not always convenient XD

                                      1 Reply Last reply Reply Quote 0
                                      • Anxietier
                                        Anxietier @mikael last edited by

                                        @mikael said:

                                        @Anxietier, thanks for catching this. Pan end event was not properly handled, fixed now in the version on the repo.

                                        expecting for new version (πŸ‘ Ν‘β›β€―ΝœΚ– ͑❛)πŸ‘

                                        mikael 1 Reply Last reply Reply Quote 0
                                        • mikael
                                          mikael @Anxietier last edited by

                                          @Anxietier, is there a specific reason why you are using the Python version instead of the native iOS gestures? Just curious, because I no longer remember why I wrote pygestures. 😁 ... Probably just because I wanted to see if I could do it.

                                          Anxietier 1 Reply Last reply Reply Quote 1
                                          • Anxietier
                                            Anxietier @mikael last edited by

                                            @mikael
                                            well, im not good at math, i tried use touch_began\move\ended, and surely i can make simple function, but as it became complex, my brain be in chaos, XD

                                            mikael 1 Reply Last reply Reply Quote 0
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