mirror of https://github.com/electron/electron
110 lines
3.0 KiB
Markdown
110 lines
3.0 KiB
Markdown
# View
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> Create and layout native views.
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Process: [Main](../glossary.md#main-process)
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This module cannot be used until the `ready` event of the `app`
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module is emitted.
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```js
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const { BaseWindow, View } = require('electron')
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const win = new BaseWindow()
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const view = new View()
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view.setBackgroundColor('red')
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view.setBounds({ x: 0, y: 0, width: 100, height: 100 })
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win.contentView.addChildView(view)
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```
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## Class: View
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> A basic native view.
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Process: [Main](../glossary.md#main-process)
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`View` is an [EventEmitter][event-emitter].
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### `new View()`
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Creates a new `View`.
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### Instance Events
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Objects created with `new View` emit the following events:
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#### Event: 'bounds-changed'
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Emitted when the view's bounds have changed in response to being laid out. The
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new bounds can be retrieved with [`view.getBounds()`](#viewgetbounds).
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### Instance Methods
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Objects created with `new View` have the following instance methods:
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#### `view.addChildView(view[, index])`
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* `view` View - Child view to add.
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* `index` Integer (optional) - Index at which to insert the child view.
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Defaults to adding the child at the end of the child list.
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If the same View is added to a parent which already contains it, it will be reordered such that
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it becomes the topmost view.
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#### `view.removeChildView(view)`
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* `view` View - Child view to remove.
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#### `view.setBounds(bounds)`
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* `bounds` [Rectangle](structures/rectangle.md) - New bounds of the View.
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#### `view.getBounds()`
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Returns [`Rectangle`](structures/rectangle.md) - The bounds of this View, relative to its parent.
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#### `view.setBackgroundColor(color)`
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* `color` string - Color in Hex, RGB, ARGB, HSL, HSLA or named CSS color format. The alpha channel is
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optional for the hex type.
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Examples of valid `color` values:
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* Hex
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* `#fff` (RGB)
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* `#ffff` (ARGB)
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* `#ffffff` (RRGGBB)
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* `#ffffffff` (AARRGGBB)
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* RGB
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* `rgb\(([\d]+),\s*([\d]+),\s*([\d]+)\)`
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* e.g. `rgb(255, 255, 255)`
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* RGBA
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* `rgba\(([\d]+),\s*([\d]+),\s*([\d]+),\s*([\d.]+)\)`
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* e.g. `rgba(255, 255, 255, 1.0)`
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* HSL
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* `hsl\((-?[\d.]+),\s*([\d.]+)%,\s*([\d.]+)%\)`
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* e.g. `hsl(200, 20%, 50%)`
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* HSLA
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* `hsla\((-?[\d.]+),\s*([\d.]+)%,\s*([\d.]+)%,\s*([\d.]+)\)`
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* e.g. `hsla(200, 20%, 50%, 0.5)`
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* Color name
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* Options are listed in [SkParseColor.cpp](https://source.chromium.org/chromium/chromium/src/+/main:third_party/skia/src/utils/SkParseColor.cpp;l=11-152;drc=eea4bf52cb0d55e2a39c828b017c80a5ee054148)
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* Similar to CSS Color Module Level 3 keywords, but case-sensitive.
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* e.g. `blueviolet` or `red`
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**Note:** Hex format with alpha takes `AARRGGBB` or `ARGB`, _not_ `RRGGBBAA` or `RGB`.
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#### `view.setVisible(visible)`
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* `visible` boolean - If false, the view will be hidden from display.
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### Instance Properties
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Objects created with `new View` have the following properties:
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#### `view.children` _Readonly_
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A `View[]` property representing the child views of this view.
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[event-emitter]: https://nodejs.org/api/events.html#events_class_eventemitter
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