73 lines
2.0 KiB
Markdown
73 lines
2.0 KiB
Markdown
---
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sidebar_label: QMainWindow
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title: QMainWindow
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---
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> Create and control windows.
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**This class is a JS wrapper around Qt's [QMainWindow class](https://doc.qt.io/qt-5/qmainwindow.html)**
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A `QMainWindow` provides a main application window. Every widget in NodeGui should be a child/nested child of QMainWindow. QMainWindow in NodeGui is also responsible for FlexLayout calculations of its children.
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**QMainWindow inherits from [NodeWidget](api/NodeWidget.md)**
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### Example
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```javascript
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const { QMainWindow, QWidget } = require("@nodegui/nodegui");
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const win = new QMainWindow();
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const centralWidget = new QWidget();
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win.setCentralWidget(centralWidget);
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win.show();
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global.win = win; // prevent's gc of win
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```
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QMainWindow needs to have a central widget set before other widgets can be added as a children/nested children.
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Once a central widget is set you can add children/layout to the central widget.
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## Static Methods
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QMainWindow can access all the static methods defined in [NodeWidget](api/NodeWidget.md)
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## Instance Properties
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QMainWindow can access all the instance properties defined in [NodeWidget](api/NodeWidget.md)
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Additionally it also has the following instance properties:
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### `win.layout`
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A `NodeLayout` representing current layout that is set on the window. If a centralWidget is set then the layout of central widget is returned.
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### `win.centralWidget`
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A `NodeWidget` representing currently set central widget on the window.
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## Instance Methods
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QMainWindow can access all the instance methods defined in [NodeWidget](api/NodeWidget.md)
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Additionally it also has the following instance methods:
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### `win.setCentralWidget(widget)`
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Sets the given widget to be the main window's central widget.
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- `widget` NodeWidget - Any widget that inherits from NodeWidget class.
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### `win.setMenuBar(menuBar)`
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Sets the given menuBar to be the window's menubar widget.
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- `menuBar` [QMenuBar](api/QMenuBar)
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### `win.setMenuWidget(menuWidget)`
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Sets the given widget to be the window's menubar widget.
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- `menuWidget` NodeWidget
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