System-provided Widget library.
| base_widget | This is a base Widget that draws a background and a box with colors, based on the settings
in the properties. Custom Widgets can use the BaseWidget as a top-level widget for drawing
a background or the bounding box, extending it later.
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| button_widget | This is a Widget that provides button functionality.
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| checkbox_widget | This is a Widget that shows a checkbox, indicating an "X" inside the box when selected,
and a blank box otherwise.
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| grid_widget | This is a Widget that draws a grid inside the body of the Widget.
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| group_box_widget | This is a Widget that draws a grouping box.
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| image_button_widget | This is a Widget that acts as a ButtonWidget, but with an image.
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| image_widget | This is an image Widget that draws an image (in any of the supported image formats that SDL2 provides).
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| menu_item_widget | This is a Widget that, when hovered, will be highlighted, and the highlight will disappear
once the button is clicked.
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| popup_menu_widget | This is a Widget that displays a popup menu of items that can be selected, and once selected,
the parent object will be hidden from view.
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| progress_widget | This is a Widget that can be used to show a progress bar.
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| radio_button_widget | This is a Widget that allows for a selection of one object in a group.
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| text_widget | This is a text Widget that draws text given a style, justification, font name, size, and
body of text.
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| toggle_button_widget | This is a Widget that can be selected/toggled on or off.
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