kivyforms/formcanvas.py

   1 from kivy.graphics import Color, Line
   2 from kivy.uix.behaviors import ButtonBehavior
   3 from kivy.uix.boxlayout import BoxLayout
   4 from kivy.uix.button import Button
   5 from kivy.uix.stacklayout import StackLayout
   6
   7 class Grabbable(BoxLayout):
   8     def __init__(self, **kwargs):
   9         super(Grabbable, self).__init__(**kwargs)
  10         self.detached = False
  11         self.form_canvas = None
  12
  13         self.point_area = None
  14         with self.canvas.after:
  15             Color(1, 1, 0)
  16             self.line = Line(points=[])
  17
  18     def point(self, touch=None):
  19         if touch:
  20             side = self.x + self.width / 6
  21             if touch.x > side * 5:
  22                 self.point_area = 'right'
  23                 self.line.points = [self.x + self.width + 5, self.y + 5, self.x + self.width + 5, self.y + self.height - 5]
  24             elif touch.x < side:
  25                 self.point_area = 'left'
  26                 self.line.points = [self.x - 5, self.y + 5, self.x - 5, self.y + self.height - 5]
  27             elif touch.y > self.y + self.height / 2:
  28                 self.point_area = 'top'
  29                 self.line.points = [self.x + 5, self.y + self.height + 5, self.x + self.width - 5, self.y + self.height + 5]
  30             else:
  31                 self.point_area = 'bottom'
  32                 self.line.points = [self.x + 5, self.y - 5, self.x + self.width - 5, self.y - 5]
  33
  34         else:
  35             self.point_area = None
  36             self.line.points = []
  37
  38     def get_form_canvas(self):
  39         parent = self.parent
  40         while parent and not isinstance(parent, FormCanvas):
  41             parent = parent.parent
  42         return parent
  43
  44     def get_index(self):
  45         for idx in range(len(self.parent.children)):
  46             if self.parent.children[idx] is self:
  47                 return idx
  48         return None
  49
  50     def detach(self):
  51         self.detached = True
  52         self.form_canvas = self.get_form_canvas()
  53         root_window = self.get_root_window()
  54         self.parent.remove_widget(self)
  55         self.size_hint = (None, None)
  56         self.width = 150
  57         self.height = 50
  58         root_window.add_widget(self)
  59
  60     def attach(self, x, y):
  61         self.detached = False
  62         self.parent.remove_widget(self)
  63         self.height = self.form_canvas.widgets_height
  64         self.size_hint = self.form_canvas.widgets_size_hint
  65
  66         for widget in self.form_canvas.walk(restrict=True):
  67             if isinstance(widget, Grabbable) and widget.collide_point(x, y):
  68                 idx = widget.get_index()
  69                 if widget.point_area == 'top':
  70                     widget.parent.add_widget(self, index=idx + 1)
  71                 elif widget.point_area == 'bottom':
  72                     widget.parent.add_widget(self, index=idx)
  73                 else:
  74                     parent = widget.parent
  75                     if not isinstance(parent, BoxLayout):
  76                         box = parent.create_box()
  77                         parent.add_widget(box, index=idx)
  78                         parent.remove_widget(widget)
  79                         box.add_widget(widget)
  80                         idx = 0
  81                         parent = box
  82                     if widget.point_area == 'left':
  83                         parent.add_widget(self, index=idx + 1)
  84                     else:
  85                         parent.add_widget(self, index=idx)
  86                 widget.point()
  87                 break
  88         else:
  89             self.form_canvas.add_widget(self)
  90
  91     def on_touch_down(self, touch):
  92         if self.collide_point(*touch.pos):
  93             if touch.grab_current is None:
  94                 touch.grab(self)
  95                 return True
  96         return super(Grabbable, self).on_touch_down(touch)
  97
  98     def on_touch_move(self, touch):
  99         if touch.grab_current is self:
 100             self.pos = [touch.x - self.width / 2, touch.y - self.height / 2]
 101             self.point()
 102             if not self.detached:
 103                 self.detach()
 104         else:
 105             if self.parent and self.parent != self.get_root_window():
 106                 if self.collide_point(touch.x, touch.y):
 107                     self.point(touch)
 108                 else:
 109                     self.point()
 110
 111     def on_touch_up(self, touch):
 112         if touch.grab_current is self:
 113             touch.ungrab(self)
 114             if self.detached:
 115                 self.attach(touch.x, touch.y)
 116
 117
 118 class FormCanvas(ButtonBehavior, StackLayout):
 119     def __init__(self, *args, **kwargs):
 120         super(FormCanvas, self).__init__(*args, **kwargs)
 121         self.n = 0
 122         self.orientation = 'lr-tb'
 123         self.padding = [10, 10, 10, 10]
 124         self.spacing = [10, 10]
 125
 126         self.widgets_height = 40
 127         self.widgets_size_hint = (1, None)
 128
 129     def on_press(self, *args):
 130         self.n += 1
 131         g = Grabbable(
 132             height=self.widgets_height,
 133             size_hint=self.widgets_size_hint
 134         )
 135         g.add_widget(Button(text=str(self.n)))
 136         self.add_widget(g)
 137         #print(self.export_to_kv(self))
 138
 139     def create_box(self):
 140         return BoxLayout(
 141             orientation='horizontal',
 142             height=self.widgets_height,
 143             size_hint=self.widgets_size_hint,
 144             spacing=self.spacing[0]
 145         )
 146
 147     def export_to_kv(self, widget, indent=''):
 148         kv = """StackLayout:
 149     orientation: '{orientation}'
 150     padding: {padding}
 151     spacing: {spacing}
 152 """.format(orientation=self.orientation, padding=self.padding, spacing=self.spacing)
 153
 154         indent = '    '
 155         stack = [self]
 156
 157         widgets = self.walk(restrict=True)
 158         next(widgets)    # the first widget is the FormCanvas
 159         for widget in widgets:
 160             if not isinstance(widget, Grabbable):
 161                 # Look for the widget position inside the tree
 162                 parent = widget.parent
 163                 if isinstance(parent, Grabbable):
 164                     parent = parent.parent
 165                 while not parent is stack[-1]:
 166                     stack.pop()
 167
 168                 # Widget header
 169                 kv += '{indent}{widget}:\n'.format(indent=indent*len(stack), widget=type(widget).__name__)
 170
 171                 stack.append(widget)
 172
 173                 # Widget attributes
 174                 kv += """{indent}height: 40
 175 {indent}size_hint: (1., None)
 176 {indent}text: '{text}'
 177 """.format(indent=indent*len(stack), text=widget.text)
 178
 179         return kv