tkinter - resize text widget (sizegrip for text widget)

Question

My goal is to have a "sizegrip widget" that enables the user to resize a text widget.

Picture to illustrate: (I apologize for the bad gridding)

Is it possible to make the sizegrip widget resize a text widget instead of the root window?

Any alternative widget that fits my needs?

Answer 1

If you really want to do this here is an example that uses place to manage the frame containing the text widget, scrollbar and sizegrip. If you remove the default bindings and supply new ones for the sizegrip then you can prevent it from changing the toplevel geometry and make it do something else. Note that a paned window or two is the more normal UI design for this kind of thing.

import sys
import tkinter as tk
import tkinter.ttk as ttk

class App(ttk.Frame):
    def __init__(self, parent, title=None):
        super().__init__(parent)
        parent.wm_geometry("600x400")
        parent.wm_title(title)
        self.top = tk.Frame(self, height=100, background="green4")
        self.middle = tk.Frame(self, background="red4")
        self.lower = tk.Frame(self, height=100, background="blue4")

        self.textframe = ttk.Frame(self.middle)
        self.text = tk.Text(self.textframe)
        self.vs = ttk.Scrollbar(self.textframe,
                                command=self.text.yview)
        self.sg = ttk.Sizegrip(self.textframe)
        self.text.configure(yscrollcommand=self.vs.set)
        self.text.grid(row=0, column=0, sticky="news")
        self.vs.grid(row=0, column=1, sticky="news")
        self.sg.grid(row=1, column=1, sticky="sew")
        self.textframe.grid_rowconfigure(0, weight=1)
        self.textframe.grid_columnconfigure(0, weight=1)
        self.middle.bind('<Map>', self.Place)

        self.sg.bindtags((self.sg, '.','all'))
        self.sg.bind('<Button-1>', self.Press)
        self.sg.bind('<B1-Motion>', self.Drag)
        self.sg.bind('<ButtonRelease-1>', self.Release)

        self.top.grid(row=0, column=0, sticky="news")
        self.middle.grid(row=1, column=0, sticky="news")
        self.lower.grid(row=2, column=0, sticky="news")
        self.grid_rowconfigure(1, weight=1)
        self.grid_columnconfigure(0, weight=1)
        self.grid(row=0,column=0, sticky="news")
        parent.grid_rowconfigure(0, weight=1)
        parent.grid_columnconfigure(0, weight=1)

    def Press(self, ev):
        self.dragging=True
        self.dragpos = (ev.x_root, ev.y_root)

    def Drag(self, ev):
        if self.dragging:
            dx = ev.x_root - self.dragpos[0]
            dy = ev.y_root - self.dragpos[1]
            sgx = self.sg.winfo_x() + dx
            sgy = self.sg.winfo_y() + dy
            sgw = self.sg.winfo_reqwidth()
            sgh = self.sg.winfo_reqheight()
            max_w = self.middle.winfo_width() - sgw
            max_h = self.middle.winfo_height() - sgh
            if sgx < 0 or sgx > max_w or sgy < 0 or sgy > max_h:
                return
            self.textframe.place(x=0, y=0,
                            width=sgx+sgw, height=sgy+sgh)
            self.dragpos = (ev.x_root, ev.y_root)

    def Release(self, ev):
        self.dragging=False

    def Place(self, ev):
        """Place the text widget controls once the rest of the
        application has been mapped so we actually have a size
        to work from.
        Reset the Map event to avoid re-calling this code."""
        self.textframe.bind('<Map>', None)
        self.textframe.place(x=0, y=0,
                             width=self.middle.winfo_width(),
                             height=self.middle.winfo_height())

def main(args=None):
    root = tk.Tk()
    app = App(root, "Sizegrip demo")
    root.mainloop()
    return 0

if __name__ == '__main__':
    sys.exit(main(sys.argv[1:]))

The result: