From fcd15da3f3e8eff3232e09dc4c30fc0a84afde74 Mon Sep 17 00:00:00 2001
From: Ian Jauslin <ian@jauslin.org>
Date: Wed, 20 Oct 2021 11:35:09 -0400
Subject: [PATCH] multiple selection

---
 cross.py | 63 ++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 54 insertions(+), 9 deletions(-)

diff --git a/cross.py b/cross.py
index 29aeee0..ae9a170 100644
--- a/cross.py
+++ b/cross.py
@@ -2,6 +2,7 @@ import math
 import sys
 from kivy.graphics import Color,Line,Rectangle
 from kivy.uix.widget import Widget
+from kivy.core.window import Window
 
 from point import Point
 from tools import isint_nonzero,sgn
@@ -223,12 +224,22 @@ class Cross_painter(Widget):
         # cross under mouse
         self.undermouse=None
 
+        # list of selected crosses
+        self.selected=[]
+
         # app is used to share information between widgets
         self.app=app
 
+        # modifiers
+        self.modifiers=[]
+
         # init Widget
         super(Cross_painter,self).__init__(**kwargs)
 
+        # init keyboard
+        self.keyboard = Window.request_keyboard(None,self,"text")
+        self.keyboard.bind(on_key_down=self.on_key_down,on_key_up=self.on_key_up)
+
     
     def reset(self):
         self.crosses=[]
@@ -244,29 +255,63 @@ class Cross_painter(Widget):
                 cross.draw()
 
 
+    # respond to keyboard
+    def on_key_down(self, keyboard, keycode, text, modifiers):
+        # check that command_prompt is not focused
+        if not self.app.command_prompt.insert:
+            if keycode[1]=="shift":
+                if not 's' in self.modifiers:
+                    self.modifiers.append('s')
+                    self.modifiers.sort()
+
+    def on_key_up(self, keyboard, keycode):
+        if keycode[1]=="shift":
+            if 's' in self.modifiers:
+                # remove
+                self.modifiers[self.modifiers.index('s')]=self.modifiers[len(self.modifiers)-1]
+                self.modifiers=self.modifiers[:len(self.modifiers)-1]
+                self.modifiers.sort()
+
+
     # respond to mouse down
     def on_touch_down(self,touch):
         # only respond to touch in area
         if self.collide_point(*touch.pos):
+
+            # unselect
+            if touch.button!="left" or self.modifiers!=['s']:
+                for sel in self.selected:
+                    sel.selected=False
+                self.selected=[]
+
             # create new cross
             if touch.button=="right":
                 if self.check_interaction_any(Point(touch.x/Cross.size,touch.y/Cross.size),None):
                     new=Cross(touch.x/Cross.size,touch.y/Cross.size)
-                    with self.canvas:
-                        new.draw()
                     # add to list
                     self.crosses.append(new)
+                    self.draw()
 
             # select cross
             if touch.button=="left":
-                # unselect
-                if self.undermouse!=None:
-                    self.undermouse.selected=False
+                # no modifiers
+                if self.modifiers==[]:
+                    # find cross under touch
+                    self.undermouse=self.find_cross(Point(touch.x/Cross.size,touch.y/Cross.size))
+
+                # shift-click
+                elif self.modifiers==['s']:
+                    clicked=self.find_cross(Point(touch.x/Cross.size,touch.y/Cross.size))
+                    if clicked!=None:
+                        if clicked not in self.selected:
+                            self.selected.append(clicked)
+                            clicked.selected=True
+                        else:
+                            # remove
+                            self.selected[self.selected.index(clicked)]=self.selected[len(self.selected)-1]
+                            self.selected=self.selected[:len(self.selected)-1]
+                            clicked.selected=False
 
-                # find cross under touch
-                self.undermouse=self.find_cross(Point(touch.x/Cross.size,touch.y/Cross.size))
-                if self.undermouse!=None:
-                    self.undermouse.selected=True
                 self.draw()