如何解决如何实现像instagram这样的textarea?
在instagram中,当我们在图片上书写文字时,可以写到一定的限制。之后,该应用程序开始减小字体大小和文本区域的宽度,并在每行上增加文本区域的高度,以使所有文本在屏幕上可见,并且文本区域保持在中心。如何实现这种功能?
HTML
<ion-content class="modal-body">
<ion-row>
<ion-col>
<!-- cancel button -->
<ion-button (click)="cancel()" expand="block" fill="clear" shape="round">
Cancel
</ion-button>
</ion-col>
<ion-col class="ion-align-self-center ion-text-center">
<!-- font style badge -->
<ion-badge class="font-style-badge ion-padding" style="font-family: {{ fontFamily }};" size="large" color="light"
mode="ios" (click)="changeFontStyle()">{{ fontFamily | uppercase }}</ion-badge>
</ion-col>
<ion-col>
<!-- done button -->
<ion-button (click)="done()" expand="block" fill="clear" shape="round">
Done
</ion-button>
</ion-col>
</ion-row>
<!-- range slider -->
<div class="range">
<ng5-slider [(value)]="fontSize" [options]="options"></ng5-slider>
</div>
<!-- write text block -->
<ion-textarea #textBlock (ionBlur)="focusText()" [(ngModel)]="text" rows="1" maxRows="8"
style="font-size: {{ fontSize }}px; font-family: {{ fontFamily }}" class="text-input"
(resized)="onResized($event)" placeholder="Write something" autosize>
</ion-textarea>
<!-- color palette fab -->
<ion-fab vertical="bottom" horizontal="end" slot="fixed">
<ion-fab-button class="color-btn" color="light" [cpPosition]="'top-left'" [cpPositionOffset]="'50%'"
[cpPositionRelativetoArrow]="true" [(colorPicker)]="textColor" tappable>
<ion-icon color="dark" name="color-palette"></ion-icon>
</ion-fab-button>
</ion-fab>
</ion-content>
TS
onResized(height) {
console.log('textblock resized height,fontsize: ',height,this.fontSize);
if (height > this.textBlockHeight) {
// textblock height is increased
this.textBlockHeight = height;
console.log('new line added');
} else if (height < this.textBlockHeight) {
// textblock height is decreased
this.textBlockHeight = height;
console.log('line removed');
} else {
// textblock height not changed
}
}
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