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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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    • mikael
      mikael @stephen last edited by

      @stephen, the original request for ”pull to refresh” was covered earlier with one line of ”math”. What are you trying to achieve here? Spring force? Coulomb effect?

      If you like scene and like to play with forces, you could look at SpriteKit - but that would not be ”rolling your own”.

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

        @mikael its ok but yes i was trying to acheive a spring like constraint. but ill go ahead a put it to the side for now. thanks for the reply.

        1 Reply Last reply Reply Quote 0
        • Drizzel
          Drizzel last edited by Drizzel

          I‘m trying to double tap on a TableViewCell without actually selecting it, but it should still be selectable on a single tap. How would I go about doing this?

          Let’s assume I have this code:

          import ui
          import gestures
          
          def double_tap(data):
          	print('double tapped row', data.view.row)
          def tap(data):
          	print('tapped', data.view.row)
          def long_press(data):
          	print('long pressed', data.view.row)
          
          def tableview_cell_for_row(tableview, section, row):
          	data = tableview.data_source.items[row]
          	cell = ui.TableViewCell('subtitle')
          	cell.text_label.text = data
          	cell.row = row
          	gestures.doubletap(cell, double_tap)
          	#gestures.tap(cell, tap, number_of_touches_required = 1)
          	#gestures.long_press(cell, long_press, minimum_press_duration = .2)
          	
          	return cell
          	
          class Delegate():
          	def tableview_did_select(self, tableview, section, row):
          		print('selected row', row)
          
          tv = ui.TableView()
          tv.delegate = Delegate()
          tv.data_source = ui.ListDataSource([str(x) for x in range(5)])
          tv.data_source.delete_enabled = False
          tv.data_source.tableview_cell_for_row = tableview_cell_for_row
          tv.frame = (tv.frame[0], tv.frame[1], 400, 400)
          
          tv.present(style = 'sheet')
          
          stephen mikael 3 Replies Last reply Reply Quote 0
          • stephen
            stephen @Drizzel last edited by stephen

            @Drizzel said:

            I‘m trying to double tap on a TableViewCell without actually selecting it, but it should still be selectable on a single tap. How would I go about doing this?

            Let’s assume I have this code:

            import ui
            import gestures
            
            def double_tap(data):
            	print('double tapped row', data.view.row)
            def tap(data):
            	print('tapped', data.view.row)
            def long_press(data):
            	print('long pressed', data.view.row)
            
            def tableview_cell_for_row(tableview, section, row):
            	data = tableview.data_source.items[row]
            	cell = ui.TableViewCell('subtitle')
            	cell.text_label.text = data
            	cell.row = row
            	gestures.doubletap(cell, double_tap)
            	#gestures.tap(cell, tap, number_of_touches_required = 1)
            	#gestures.long_press(cell, long_press, minimum_press_duration = .2)
            	
            	return cell
            	
            class Delegate():
            	def tableview_did_select(self, tableview, section, row):
            		print('selected row', row)
            
            tv = ui.TableView()
            tv.delegate = Delegate()
            tv.data_source = ui.ListDataSource([str(x) for x in range(5)])
            tv.data_source.delete_enabled = False
            tv.data_source.tableview_cell_for_row = tableview_cell_for_row
            tv.frame = (tv.frame[0], tv.frame[1], 400, 400)
            
            tv.present(style = 'sheet')
            

            i believe you might wand def tableview_cell_for_row(tableview, section, row): as a method of class Delegate instead of a global function.

            Drizzel 1 Reply Last reply Reply Quote 1
            • stephen
              stephen @Drizzel last edited by

              @Drizzel
              im sure there is a much simpler way but...

              why not have a state checker give x time to look for a second tap before executing functionality for a single tap? possibly a decorator?

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

                @Drizzel, below works to separate the two gestures, but we lose the visual feedback for the tap selection, you would need to implement that yourself.

                Better would be to find the built-in tap and give our doubletap preference over it, but I could not (yet...?) find it on the tableview, cell, content view, or the label.

                import ui
                import gestures
                
                def double_tap(data):
                    print('double tapped row', data.view.row)
                    
                def tap(data):
                    print('tapped', data.view.row)
                    
                def tableview_cell_for_row(tableview, section, row):
                    data = tableview.data_source.items[row]
                    cell = ui.TableViewCell('subtitle')
                    cell.selectable = False
                    cell.text_label.text = data
                    cell.row = row
                    doubler = gestures.doubletap(cell, double_tap)
                    tapper = gestures.tap(cell, tap)
                    doubler.before(tapper)
                    return cell
                    
                class Delegate():
                    def tableview_did_select(self, tableview, section, row):
                        print('selected row', row)
                
                tv = ui.TableView(allows_selection=False)
                tv.delegate = Delegate()
                tv.data_source = ui.ListDataSource([str(x) for x in range(5)])
                tv.data_source.delete_enabled = False
                tv.data_source.tableview_cell_for_row = tableview_cell_for_row
                
                tv.present('fullscreen')
                
                1 Reply Last reply Reply Quote 3
                • Drizzel
                  Drizzel last edited by

                  @mikael thanks, that works. I just change the cell‘s background color to lightgrey for visual feedback

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

                    @stephen True, I corrected it :) The code was a bit rushed 🤷‍♂️

                    1 Reply Last reply Reply Quote 1
                    • stephen
                      stephen last edited by

                      awesome 😎🤓😊

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

                        @Drizzel, here’s a version that supports both the doubletap and regular row selection.

                        import ui
                        import gestures
                        
                        def double_tap(data):
                            print('double tapped row', data.view.row)
                            
                        def tableview_cell_for_row(tableview, section, row):
                            data = tableview.data_source.items[row]
                            cell = ui.TableViewCell('subtitle')
                            cell.text_label.text = data
                            cell.row = row
                            doubler = gestures.doubletap(cell, double_tap)
                            doubler.recognizer.delaysTouchesBegan = True
                            return cell
                            
                        class Delegate():
                            def tableview_did_select(self, tableview, section, row):
                                print('selected row', row)
                        
                        tv = ui.TableView()
                        tv.delegate = Delegate()
                        tv.data_source = ui.ListDataSource([str(x) for x in range(5)])
                        tv.data_source.delete_enabled = False
                        tv.data_source.tableview_cell_for_row = tableview_cell_for_row
                        
                        tv.present('fullscreen')
                        
                        cvp 2 Replies Last reply Reply Quote 0
                        • Anxietier
                          Anxietier last edited by

                          hi, i found another bug, after i use 5 fingers to switch app and get back, multi-touch would be not working

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

                            @mikael Do you think it would be possible to use you gestures module on an objectiveC object?

                            I want to add gestures on a SceneView object, but functions like tap require their view parameter as an object having objc_instance property (see UIGestureRecognizerDelegate init).

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

                              @mikael I solved it with

                              	def scene_view_tap(self,sender):
                              		location = self.recognizer.locationInView_(self.scene_view)
                              		node = self.scene_view.hitTest_options_(location,None)
                              		print(node)
                              
                              .
                              .
                              .
                              		self.gesture_recognizer_target = ui.Button()
                              		self.gesture_recognizer_target.action = self.scene_view_tap
                              		UITapGestureRecognizer = ObjCClass('UITapGestureRecognizer')
                              		self.recognizer = UITapGestureRecognizer.alloc().initWithTarget_action_(self.gesture_recognizer_target, sel('invokeAction:')).autorelease()
                              		scene_view.addGestureRecognizer_(self.recognizer)
                              		self.scene_view = scene_view
                              
                              1 Reply Last reply Reply Quote 1
                              • mikael
                                mikael @cvp last edited by mikael

                                @cvp, forgot to advertise earlier that the latest version of gestures in the ui3 module accepts ObjC views in addition to ui module views.

                                from ui3.gestures import *
                                
                                tap(objc_view, handler)
                                
                                cvp 1 Reply Last reply Reply Quote 2
                                • cvp
                                  cvp @mikael last edited by cvp

                                  @mikael thanks, I'll try

                                  Édit: done, ok
                                  Re-Edit: marvelous module

                                  1 Reply Last reply Reply Quote 0
                                  • itibettravel
                                    itibettravel last edited by

                                    This post is deleted!
                                    1 Reply Last reply Reply Quote 0
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