NativeScript/nativescript-core/ui/layouts/layout-base.android.ts

import {
    LayoutBaseCommon, clipToBoundsProperty, isPassThroughParentEnabledProperty,
    paddingLeftProperty, paddingTopProperty, paddingRightProperty, paddingBottomProperty, Length
} from "./layout-base-common";

export * from "./layout-base-common";

export class LayoutBase extends LayoutBaseCommon {

    [clipToBoundsProperty.getDefault](): boolean {
        return true;
    }
    [clipToBoundsProperty.setNative](value: boolean) {
        // TODO: Use ClipRectangle if API > 16!

        // We can't implement this without calling setClipChildren(false) on every ancestor up in the visual tree,
        // which will kill performance. It will also lead to unwanted side effects such as other totally unrelated
        // views being affected by setting the parents' setClipChildren to false.
        // The problem in Android is that a ViewGroup either clips ALL of its children or it does not. Unlike iOS, the clipping
        // cannot be controlled on a per view basis. So clipToBounds=false will have to be somehow achieved with stacking different
        // views on top of one another in an AbsoluteLayout or GridLayout. There is always a workaround when playing with layouts.
        //
        // The following article explains this in detail:
        // http://stackoverflow.com/questions/25044085/when-drawing-outside-the-view-clip-bounds-with-android-how-do-i-prevent-underli
        console.warn(`clipToBounds with value false is not supported on Android. You can use this.android.getParent().setClipChildren(false) as an alternative`);
    }

    [isPassThroughParentEnabledProperty.setNative](value: boolean) {
        (<any>this.nativeViewProtected).setPassThroughParent(value);
    }

    [paddingTopProperty.getDefault](): Length {
        return { value: this._defaultPaddingTop, unit: "px" };
    }
    [paddingTopProperty.setNative](value: Length) {
        org.nativescript.widgets.ViewHelper.setPaddingTop(this.nativeViewProtected, Length.toDevicePixels(value, 0) + Length.toDevicePixels(this.style.borderTopWidth, 0));
    }

    [paddingRightProperty.getDefault](): Length {
        return { value: this._defaultPaddingRight, unit: "px" };
    }
    [paddingRightProperty.setNative](value: Length) {
        org.nativescript.widgets.ViewHelper.setPaddingRight(this.nativeViewProtected, Length.toDevicePixels(value, 0) + Length.toDevicePixels(this.style.borderRightWidth, 0));
    }

    [paddingBottomProperty.getDefault](): Length {
        return { value: this._defaultPaddingBottom, unit: "px" };
    }
    [paddingBottomProperty.setNative](value: Length) {
        org.nativescript.widgets.ViewHelper.setPaddingBottom(this.nativeViewProtected, Length.toDevicePixels(value, 0) + Length.toDevicePixels(this.style.borderBottomWidth, 0));
    }

    [paddingLeftProperty.getDefault](): Length {
        return { value: this._defaultPaddingLeft, unit: "px" };
    }
    [paddingLeftProperty.setNative](value: Length) {
        org.nativescript.widgets.ViewHelper.setPaddingLeft(this.nativeViewProtected, Length.toDevicePixels(value, 0) + Length.toDevicePixels(this.style.borderLeftWidth, 0));
    }
}