Initial commit.

.gitignore

+*~
+*.pyc
+*.pyo
+
+.idea

main.py

+from random import shuffle
+
+from kivy.app import App
+from kivy.clock import Clock
+from kivy.properties import BooleanProperty, ListProperty
+from kivy.modules import inspector
+from kivy.core.window import Window
+
+
+GUI_QUESTIONS = [
+    ('What are the fundamental building blocks of a GUI?',
+     ('Buttons', 'Containers', 'Layout Managers', 'Widgets'), 'Widgets'),
+    ('What kind of widget is used to organize other widgets?',
+     ('Buttons', 'Containers', 'Layout Managers', 'Organizers'), 'Containers'),
+    ('What math term describes a widget hierarchy?',
+     ('Rooted Tree', 'Separation of Concerns', 'Shrubbery', 'Vertex'), 'Rooted Tree'),
+    ('Which of the following is not a true widget property?',
+     ('Color', 'Enabledness', 'ID', 'Visibility'), 'ID'),
+    ('What process connects widgets to event handlers?',
+     ('Event Handling', 'Invocation', 'Registration', 'Selection'), 'Registration'),
+    ('Which of the following is mostly useless unless in a group of two or more?',
+     ('Buttons', 'Checkboxes', 'Radio Buttons', 'Textboxes'), 'Radio Buttons'),
+    ('Which of the following GUI frameworks uses an unflipped y axis?',
+     ('HTML+CSS', 'JavaFX', 'Kivy', 'WPF'), 'Kivy'),
+]
+
+COLOR_QUESTIONS = [
+    ('What of the following RGBA quadruples represents red?',
+     ('(1, 0, 0, 1)', '(0, 1, 0, 1)', '(0, 1, 1, 0)', '(0, 0, 1, 1)'), '(1, 0, 0, 1)'),
+    ('What of the following RGBA quadruples represents yellow?',
+     ('(1, 0, 1, 1)', '(1, 1, 0, 1)', '(0, 1, 1, 1)', '(1, 1, 1, 1)'), '(1, 1, 0, 1)'),
+    ('What of the following RGBA quadruples represents green?',
+     ('(1, 0, 0, 1)', '(0, 1, 0, 1)', '(0, 1, 1, 0)', '(0, 0, 1, 1)'), '(0, 1, 0, 1)'),
+    ('What of the following RGBA quadruples represents cyan?',
+     ('(1, 0, 1, 1)', '(1, 1, 0, 1)', '(0, 1, 1, 1)', '(1, 1, 1, 1)'), '(0, 1, 1, 1)'),
+    ('What of the following RGBA quadruples represents blue?',
+     ('(1, 0, 0, 1)', '(0, 1, 0, 1)', '(0, 1, 1, 0)', '(0, 0, 1, 1)'), '(0, 0, 1, 1)'),
+    ('What of the following RGBA quadruples represents magenta?',
+     ('(1, 0, 1, 1)', '(1, 1, 0, 1)', '(0, 1, 1, 1)', '(1, 1, 1, 1)'), '(1, 0, 1, 1)'),
+    ('What of the following RGBA quadruples represents white?',
+     ('(1, 0, 1, 1)', '(1, 1, 0, 1)', '(0, 1, 1, 1)', '(1, 1, 1, 1)'), '(1, 1, 1, 1)'),
+    ('What of the following RGBA quadruples represents black?',
+     ('(0, 0, 0, 0)', '(0, 0, 0, 1)', '(0, 0, 1, 0)', '(0, 0, 1, 1)'), '(0, 0, 0, 1)'),
+]
+
+TREE_QUESTIONS = [
+    ('If a widget X is directly inside a container Y, then Y is X\'s what?',
+     ('Child', 'Descendant', 'Parent', 'Root'), 'Parent'),
+    ('If a widget X is directly inside a container Y, then X is Y\'s what?',
+     ('Ancestor', 'Child', 'Parent', 'Leaf'), 'Child'),
+    ('If a container Y is not inside anything else, then Y is called what?',
+     ('Child', 'Descendant', 'Parent', 'Root'), 'Root'),
+    ('If a widget X is inside Y inside a container Z, then Z is X\'s what?',
+     ('Ancestor', 'Child', 'Descendant', 'Parent'), 'Ancestor'),
+    ('If a widget X is inside Y inside a container Z, then X is Z\'s what?',
+     ('Ancestor', 'Child', 'Descendant', 'Parent'), 'Descendant'),
+    ('If a widget X contains no other widgets, then X is called what?',
+     ('Ancestor', 'Leaf', 'Parent', 'Root'), 'Leaf'),
+    ('If the widgets W and X are directly inside a container Y, then W is X\'s what?',
+     ('Child', 'Parent', 'Sibling', 'Tree'), 'Sibling'),
+]
+
+
+PAUSE_TIME = 0.75  # seconds
+
+
+class QuizzerApp(App):
+    DEFAULT_QUESTION = ('What is your favourite color?', ('Blue', 'Blue', 'Blue', 'Blue'), 'Blue')
+
+    questions = ListProperty([])
+    paused = BooleanProperty(False)
+    correct = BooleanProperty(False)
+
+    def build(self):
+        inspector.create_inspector(Window, self)
+
+    def on_start(self):
+        self.reshuffle()
+
+    def reshuffle(self):
+        questions = []
+        if self.root.ids.gui.active:
+            questions += GUI_QUESTIONS
+        elif self.root.ids.color.active:
+            questions += COLOR_QUESTIONS
+        elif self.root.ids.tree.active:
+            questions += TREE_QUESTIONS
+        shuffle(questions)
+        self.questions = questions
+
+    def answer(self, answer):
+        question = self.questions[-1] if len(self.questions) > 0 else self.DEFAULT_QUESTION
+        self.paused = True
+        self.correct = answer == question[2]
+        Clock.schedule_once(lambda delta: self.unpause(), PAUSE_TIME)
+
+    def unpause(self):
+        self.paused = False
+        if len(self.questions) > 0:
+            self.questions.pop()
+        if len(self.questions) == 0:
+            self.reshuffle()
+
+
+if __name__ == '__main__':
+    app = QuizzerApp()
+    app.run()

quizzer.kv

+ScreenManager:
+    Screen:
+        name: 'settings'
+        BoxLayout:
+            orientation: 'vertical'
+            Label:
+                text: 'Choose a topic:'
+                font_size: sp(24)
+            BoxLayout:
+                orientation: 'horizontal'
+                Widget:
+                CheckBox:
+                    id: gui
+                    group: 'categories'
+                    active: True
+                    size_hint: (None, None)
+                    size: (sp(32), gui_label.height)
+                    on_active: app.reshuffle()
+                Label:
+                    id: gui_label
+                    text: 'Graphical User Interfaces'
+                    size_hint: (None, 1.0)
+                    size: self.texture_size
+                Widget:
+            BoxLayout:
+                orientation: 'horizontal'
+                Widget:
+                CheckBox:
+                    id: color
+                    group: 'categories'
+                    active: False
+                    size_hint: (None, None)
+                    size: (sp(32), color_label.height)
+                    on_active: app.reshuffle()
+                Label:
+                    id: color_label
+                    text: 'RGBA Quadruples'
+                    size_hint: (None, 1.0)
+                    size: self.texture_size
+                Widget:
+            BoxLayout:
+                orientation: 'horizontal'
+                Widget:
+                CheckBox:
+                    id: tree
+                    group: 'categories'
+                    active: False
+                    size_hint: (None, None)
+                    size: (sp(32), tree_label.height)
+                    on_active: app.reshuffle()
+                Label:
+                    id: tree_label
+                    text: 'Containment Hierarchies'
+                    size_hint: (None, 1.0)
+                    size: self.texture_size
+                Widget:
+            BoxLayout:
+                Widget:
+                Button:
+                    text: 'Begin!'
+                    size_hint: (None, None)
+                    size: (self.texture_size[0] + 64, self.texture_size[1] + 64)
+                    on_press:
+                        root.transition.direction = 'left'
+                        root.current = 'quiz'
+                Widget:
+            Widget:
+                size_hint: (1.0, 0.5)
+    Screen:
+        name: 'quiz'
+        BoxLayout:
+            orientation: 'vertical'
+            Button:
+                text: 'Change Topic'
+                size_hint: (1, 0.25)
+                disabled: app.paused
+                on_press:
+                    root.transition.direction = 'right'
+                    root.current = 'settings'
+            Label:
+                text: 'Do you know…'
+                font_size: sp(24)
+                size_hint: (1, None)
+                size: (self.texture_size[0] + 64, self.texture_size[1] + 64)
+            Label:
+                text: (app.questions[-1] if len(app.questions) > 0 else app.DEFAULT_QUESTION)[0] if not app.paused else ('Correct!' if app.correct else 'Incorrect!')
+                text_size: (self.width, None)
+                halign: 'center'
+                color: (0.0, 0.0, 0.75, 1.0) if not app.paused else ((0.0, 1.0, 0.0, 1.0) if app.correct else (0.5, 0.0, 0.0, 1.0))
+            GridLayout:
+                rows: 2
+                Button:
+                    text: (app.questions[-1] if len(app.questions) > 0 else app.DEFAULT_QUESTION)[1][0]
+                    disabled: app.paused
+                    on_press: app.answer(self.text)
+                Button:
+                    text: (app.questions[-1] if len(app.questions) > 0 else app.DEFAULT_QUESTION)[1][1]
+                    disabled: app.paused
+                    on_press: app.answer(self.text)
+                Button:
+                    text: (app.questions[-1] if len(app.questions) > 0 else app.DEFAULT_QUESTION)[1][2]
+                    disabled: app.paused
+                    on_press: app.answer(self.text)
+                Button:
+                    text: (app.questions[-1] if len(app.questions) > 0 else app.DEFAULT_QUESTION)[1][3]
+                    disabled: app.paused
+                    on_press: app.answer(self.text)
+
+# All screens are white.
+<Screen>:
+    canvas.before:
+        Color:
+            rgba: (1.0, 1.0, 1.0, 1.0)
+        Rectangle:
+            pos: self.pos
+            size: self.size
+
+# All labels are blue.
+<Label>:
+    color: (0.0, 0.0, 0.75, 1.0)
+
+# All checkboxes are blue.
+<CheckBox>:
+    canvas:
+        Color:
+            rgba: (0.0, 0.0, 0.75, 1.0)
+        Rectangle:
+            source: f'atlas://data/images/defaulttheme/checkbox{"_radio" if self.group else ""}{"_disabled" if self.disabled else ""}{"_on" if self.active else "_off"}'
+            size: sp(32), sp(32)
+            pos: int(self.center_x - sp(16)), int(self.center_y - sp(16))
+
+# All buttons have white text.
+<Button>:
+    color: (1.0, 1.0, 1.0, 1.0)