How To Resolve "invalid Property Name" Error To Make File Chooser With Kivy?

I am new to kivy and am trying to build an application in which I have three tabs: one for loading the image, another for displaying the image and a grayscale version side by side,

Solution 1:

Please refer to the example for details.

Example

main.py

from kivy.app import App
from kivy.uix.tabbedpanel import TabbedPanel
from kivy.properties import ObjectProperty
from PIL import Image


classRootWidget(TabbedPanel):
    manager = ObjectProperty(None)
    img = ObjectProperty(None)
    img3 = ObjectProperty(None)
    img4 = ObjectProperty(None)
    lab = ObjectProperty(None)

    defon_touch_up(self, touch):
        ifnot self.img3.collide_point(*touch.pos):
            returnTrueelse:
            self.lab.text = 'Pos: (%d,%d)' % (touch.x, touch.y)
            returnTruedefswitch_to(self, header):
        # set the Screen manager to load  the appropriate screen# linked to the tab head instead of loading content
        self.manager.current = header.screen

        # we have to replace the functionality of the original switch_to
        self.current_tab.state = "normal"
        header.state = 'down'
        self._current_tab = header

    defselect_to(self, *args):
        try:
            print(args[1][0])
            iw = Image.open(args[1][0])
            iw.save('./phase.jpg')
            gray = iw.convert('1')
            gray.save('./gray_im.jpg')
            self.img3.source = './gray_im.jpg'
            self.img4.source = './gray_im.jpg'
            self.img.source = './phase.jpg'
            self.img.reload()
            self.img3.reload()
            self.img4.reload()
        except:
            passdefupdate_touch_label(self, label, touch):
        label.text = 'Pos:(%d, %d)' % (touch.x, touch.y)
        label.texture_update()
        label.pos = touch.pos
        label.size = label.texture_size[0] + 20, label.texture_size[1] + 20classTestApp(App):
    title = 'Screen Widget'defbuild(self):
        return RootWidget()

    defon_pause(self):
        returnTrueif __name__ == '__main__':
    TestApp().run()

test.kv

#:kivy 1.10.1<RootWidget>:manager:managerimg:imgimg3:img3img4:img4lab:labdo_default_tab:FalseScreenManager:id:managerScreen:id:sc1name:'Loadimg'FileChooserIconView:canvas.before:Color:rgb:0.5,0.4,0.5Rectangle:pos:self.possize:self.sizeon_selection:root.select_to(*args)Screen:id:sc2name:'Image'FloatLayout:Button:id:labpos_hint: {"right":0.55, 'top':1}
                    size_hint:.15,0.1RelativeLayout:Image:id:imgon_touch_down:str('Relative:{}'.format(args[1].pos))pos_hint: {"left":1, 'bottom':1}
                    size_hint:0.5,1allow_stretch:TrueRelativeLayout:Image:id:img3pos_hint: {"right":1, 'bottom':1}
                    size_hint:0.5,1allow_stretch:TrueScreen:id:sc3name:'Image_'FloatLayout:Image:id:img4keep_data:Truepost:self.possize:self.sizeTabbedPanelHeader:text:sc1.namebackground_color:1,0,0,1screen:sc1.nameTabbedPanelHeader:text:sc2.namebackground_color:1,1,0,1screen:sc2.nameTabbedPanelHeader:text:sc3.namebackground_color:1,0,1,1screen:sc3.name

Output