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#!/usr/bin/env python
#[DECLARATIVE UI LAYOUT ENGINE, URL: http://forums.4fips.com/viewtopic.php?f=3&t=6896]
#[CODE BY FIPS @ 4FIPS.COM, (c) 2016 FILIP STOKLAS, MIT-LICENSED]

from layout import Vec2, Rect, Margin, Elem, Border, VStack, HStack
import sys

from PySide.QtCore import *
from PySide.QtGui import *

def make_button(parent, title, stretch):
    btn = QPushButton(title, parent)
    return Elem(btn, min_size=Vec2(*btn.size().toTuple()), stretch=stretch)

class MainWindow(QWidget):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setWindowTitle("LAYOUT DEMO BY FIPS @ 4FIPS.COM 2016")
        self.resize(600, 480)
        self.setup()

    def setup(self):
        self.meta_layout = \
        Border(margin=Margin(6, 6, 6, 6), children=[
            VStack([
                Border(margin=Margin(0, 0, 0, 4), children=[
                    VStack([
                        make_button(self, "Question:", stretch=Vec2(1, 0)),
                        make_button(self, "<...multi-line-text...>", stretch=Vec2(1, 1)),
                        make_button(self, "Hint:", stretch=Vec2(1, 0)),
                        make_button(self, "<...multi-line-text...>", stretch=Vec2(1, 1)),
                        make_button(self, "Answer:", stretch=Vec2(1, 0)),
                        make_button(self, "<...text...>", stretch=Vec2(1, 0)),
                    ]),
                ]),
                VStack(stretch=Vec2(1, 0), children=[
                    HStack(stretch=Vec2(1, 0), children=[
                        make_button(self, "Browse >", stretch=Vec2(1, 0)),
                        make_button(self, "Test >", stretch=Vec2(1, 0)),
                    ]),
                    HStack(stretch=Vec2(1, 0), children=[
                        make_button(self, "Graph >", stretch=Vec2(1, 0)),
                        make_button(self, "Setup >", stretch=Vec2(1, 0)),
                        make_button(self, "About >", stretch=Vec2(1, 0)),
                    ]),
                ]),
            ]),
        ])

    def resizeEvent(self, event):
        self.meta_layout.reshape(Rect(0, 0, *event.size().toTuple()))
        for ch in self.children():
            ch.setGeometry(*ch.meta_elem.rect)

def main():
    app = QApplication(sys.argv)
    win = MainWindow()
    win.show()
    win.raise_()
    return app.exec_()

if __name__ == "__main__":
    main()