These classes provide automatic geometry (layout) management of widgets.
| QBoxLayout | Lines up child widgets horizontally or vertically
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| QButtonGroup | Organizes QButton widgets in a group
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| QGLayoutIterator | Abstract base class of internal layout iterators
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| QGrid | Simple geometry management of its children
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| QGridLayout | Lays out widgets in a grid
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| QGroupBox | Group box frame with a title
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| QHBox | Horizontal geometry management for its child widgets
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| QHBoxLayout | Lines up widgets horizontally
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| QHButtonGroup | Organizes QButton widgets in a group with one horizontal row
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| QHGroupBox | Organizes widgets in a group with one horizontal row
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| QLayout | The base class of geometry managers
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| QLayoutItem | Abstract item that a QLayout manipulates
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| QLayoutIterator | Iterators over QLayoutItem
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| QSizePolicy | Layout attribute describing horizontal and vertical resizing policy
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| QSpacerItem | Blank space in a layout
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| QVBox | Vertical geometry management of its child widgets
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| QVBoxLayout | Lines up widgets vertically
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| QVButtonGroup | Organizes QButton widgets in a vertical column
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| QVGroupBox | Organizes a group of widgets in a vertical column
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| QWidgetItem | Layout item that represents a widget
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