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/** UI element heights which used in message height calculation */ | |
textPaddingVertical: number = 7; | |
textPaddingHorizontal: number = 10; | |
timeHeight: number = 12; | |
timeTopMargin: number = 5; | |
messageContainerVerticalMargin: number = 7; | |
dateSeperatorVerticalMargin: number = 20; | |
dateSeperatorHeight: number = 15; | |
imageHeight: number = 170; | |
imageBottomMargin: number = 10; | |
avatarHeight: number = 45; | |
windowWidth: number = Dimensions.get("window").width; | |
/** END */ | |
calculateMessageHeight(message: Message, index: number): number { | |
const textHeight = message.messageHeight; | |
let messageHeight = textHeight; | |
//If time seperator is shown | |
if ( | |
message && | |
!isSameDay( | |
message.created, | |
getSafe( | |
() => this.props.data.getDataForIndex(index + 1).created, | |
null | |
) | |
) | |
) { | |
messageHeight = | |
messageHeight + | |
this.dateSeperatorHeight + | |
this.dateSeperatorVerticalMargin * 2; | |
} | |
if (message.type === MessageType.IMAGE) { | |
messageHeight = | |
messageHeight + this.imageHeight + this.imageBottomMargin; | |
} | |
messageHeight = | |
messageHeight + | |
(this.timeHeight + this.timeTopMargin) + | |
this.textPaddingVertical * 2 + | |
this.messageContainerVerticalMargin * 2; | |
if (messageHeight < this.avatarHeight) { | |
messageHeight = this.avatarHeight; | |
} | |
return messageHeight; | |
} | |
layoutProvider = new LayoutProvider( | |
(index) => | |
this.props.data.getDataForIndex(index)?.type ?? MessageType.MESSAGE, | |
(type, dim, index) => { | |
const message = this.props.data.getDataForIndex(index); | |
dim.width = this.windowWidth - 15 * 2; | |
dim.height = this.calculateMessageHeight(message, index); | |
} | |
); | |
/* Here snippet how I calculate text height */ | |
import rnTextSize, { TSFontSpecs } from "react-native-text-size"; | |
import { Dimensions } from "react-native"; | |
const fontSpecs: TSFontSpecs = { | |
fontFamily: "Poppins-Regular", | |
fontSize: 13, | |
}; | |
const textPaddingHorizontal: number = 10; | |
const maxTextWidth: number = | |
Dimensions.get("window").width * 0.65 - textPaddingHorizontal * 2; | |
const textHeight = rnTextSize.flatHeights({ | |
...fontSpecs, | |
width: maxTextWidth, | |
text: [message.text], | |
}); | |
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