From 22831cfc194bbac075932bace36c5f5b34be07f0 Mon Sep 17 00:00:00 2001
From: Martin Putzlocher <m.putzlocher@stiftland-gymnasium.de>
Date: Tue, 28 Dec 2021 14:31:58 +0100
Subject: [PATCH] added template for tk applications and first sketch of canvas
 test

---
 tk_canvas/my_canvas.py | 68 ++++++++++++++++++++++++++++++++++++++++++
 tk_template.py         | 32 ++++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 tk_canvas/my_canvas.py
 create mode 100644 tk_template.py

diff --git a/tk_canvas/my_canvas.py b/tk_canvas/my_canvas.py
new file mode 100644
index 0000000..beaf153
--- /dev/null
+++ b/tk_canvas/my_canvas.py
@@ -0,0 +1,68 @@
+import tkinter as tk
+import tkinter.ttk as ttk
+
+class Controller(object):
+    def __init__(self, app):
+        self.app = app
+
+        self.selected = None
+        self.selected_start = None
+        self.selected_end = None
+
+    def run_process(self):
+        print("Run")
+        self.app.main_canvas.bind('<1>', self.make_circle)
+        self.app.main_canvas.bind('<3>', self.select_item)
+        self.app.main_canvas.bind('<SHIFT-1>', self.select_for_line)
+        return 0
+
+    def make_circle(self, event):
+        x = event.x
+        y = event.y
+        r = 20
+        self.app.main_canvas.create_oval(x-r, y-r, x+r, y+r, fill="white", outline="black", tag="circle")
+
+    def select_item(self, event):
+        self.app.main_canvas.bind('<Motion>', self.move_item)
+        self.app.main_canvas.bind('<1>', self.deselect_item)
+        self.app.main_canvas.addtag_withtag('selected', tk.CURRENT)
+
+    def deselect_item(self, event):
+        self.app.main_canvas.dtag('selected')
+        self.app.main_canvas.unbind('<Motion>')
+        self.app.main_canvas.bind('<1>', self.make_circle)
+
+    def move_item(self, event):
+        x = event.x
+        y = event.y
+        r = 20
+        self.app.main_canvas.coords("selected",x-r, y-r, x+r, y+r)
+
+    def select_for_line(self, event):
+        pass
+
+
+class Application(tk.Tk):
+    def __init__(self):
+        super().__init__()
+        self.con = Controller(self)
+        self.create_control_variables()
+        self.create_widgets()
+
+    def create_control_variables(self):
+        pass
+
+    def create_widgets(self):
+        self.main_canvas = tk.Canvas(master=self,  width=500, height=400, background='gray75')
+        self.main_canvas.grid(row=0, column=0)
+
+        self.b = ttk.Button(master=self, text="Start", command=self.con.run_process)
+        self.b.grid(row=1, column=0)
+
+
+# --------------------------
+# Execution
+# --------------------------
+if __name__ == "__main__":
+    app = Application()
+    app.mainloop()
diff --git a/tk_template.py b/tk_template.py
new file mode 100644
index 0000000..d1d95c0
--- /dev/null
+++ b/tk_template.py
@@ -0,0 +1,32 @@
+import tkinter as tk
+import tkinter.ttk as ttk
+
+class Controller(object):
+    def __init__(self, app):
+        self.app = app
+
+    def run_process(self):
+        print("Run")
+        return 0
+
+class Application(tk.Tk):
+    def __init__(self):
+        super().__init__()
+        self.con = Controller(self)
+        self.create_control_variables()
+        self.create_widgets()
+
+    def create_control_variables(self):
+        pass
+
+    def create_widgets(self):
+        self.b = ttk.Button(master=self, text="Start", command=self.con.run_process)
+        self.b.grid(row=1, column=0)
+
+
+# --------------------------
+# Execution
+# --------------------------
+if __name__ == "__main__":
+    app = Application()
+    app.mainloop()