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Copy pathstack-layout.ts
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206 lines (167 loc) · 7.94 KB
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import layouts = require("ui/layouts/layout");
import definition = require("ui/layouts/stack-layout");
import utils = require("utils/utils");
import dependencyObservable = require("ui/core/dependency-observable");
import enums = require("ui/enums");
import proxy = require("ui/core/proxy");
import view = require("ui/core/view");
function validateOrientation(value: any): boolean {
return value === enums.Orientation.vertical || value === enums.Orientation.horizontal;
}
export var orientationProperty = new dependencyObservable.Property(
"orientation",
"StackLayout",
new proxy.PropertyMetadata(enums.Orientation.vertical,
dependencyObservable.PropertyMetadataSettings.AffectsLayout,
undefined,
validateOrientation)
);
export class StackLayout extends layouts.Layout implements definition.StackLayout {
private _totalLength = 0;
get orientation(): string {
return this._getValue(orientationProperty);
}
set orientation(value: string) {
this._setValue(orientationProperty, value);
}
public onMeasure(widthMeasureSpec: number, heightMeasureSpec: number): void {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
var density = utils.layout.getDisplayDensity();
var measureWidth = 0;
var measureHeight = 0;
var width = utils.layout.getMeasureSpecSize(widthMeasureSpec);
var widthMode = utils.layout.getMeasureSpecMode(widthMeasureSpec);
var height = utils.layout.getMeasureSpecSize(heightMeasureSpec);
var heightMode = utils.layout.getMeasureSpecMode(heightMeasureSpec);
var isVertical = this.orientation === enums.Orientation.vertical;
var verticalPadding = (this.paddingTop + this.paddingBottom) * density;
var horizontalPadding = (this.paddingLeft + this.paddingRight) * density;
var count = this.getChildrenCount();
var measureSpec: number;
var mode = isVertical ? heightMode : widthMode;
var remainingLength: number;
if (mode === utils.layout.UNSPECIFIED) {
measureSpec = utils.layout.UNSPECIFIED;
remainingLength = 0;
}
else {
measureSpec = utils.layout.AT_MOST;
remainingLength = isVertical ? height - verticalPadding : width - horizontalPadding;
}
var childMeasureSpec: number;
if (isVertical) {
var childWidth = (widthMode === utils.layout.UNSPECIFIED) ? 0 : width - horizontalPadding;
childWidth = Math.max(0, childWidth);
childMeasureSpec = utils.layout.makeMeasureSpec(childWidth, widthMode)
}
else {
var childHeight = (heightMode === utils.layout.UNSPECIFIED) ? 0 : height - verticalPadding;
childHeight = Math.max(0, childHeight);
childMeasureSpec = utils.layout.makeMeasureSpec(childHeight, heightMode)
}
var childSize: { measuredWidth: number; measuredHeight: number };
for (var i = 0; i < count; i++) {
var child = this.getChildAt(i);
if (!child || !child._isVisible) {
continue;
}
if (isVertical) {
childSize = view.View.measureChild(this, child, childMeasureSpec, utils.layout.makeMeasureSpec(remainingLength, measureSpec));
measureWidth = Math.max(measureWidth, childSize.measuredWidth);
var viewHeight = childSize.measuredHeight;
measureHeight += viewHeight;
remainingLength = Math.max(0, remainingLength - viewHeight);
}
else {
childSize = view.View.measureChild(this, child, utils.layout.makeMeasureSpec(remainingLength, measureSpec), childMeasureSpec);
measureHeight = Math.max(measureHeight, childSize.measuredHeight);
var viewWidth = childSize.measuredWidth;
measureWidth += viewWidth;
remainingLength = Math.max(0, remainingLength - viewWidth);
}
}
measureWidth += horizontalPadding;
measureHeight += verticalPadding;
measureWidth = Math.max(measureWidth, this.minWidth * density);
measureHeight = Math.max(measureHeight, this.minHeight * density);
this._totalLength = isVertical ? measureHeight : measureWidth;
var widthAndState = view.View.resolveSizeAndState(measureWidth, width, widthMode, 0);
var heightAndState = view.View.resolveSizeAndState(measureHeight, height, heightMode, 0);
this.setMeasuredDimension(widthAndState, heightAndState);
}
public onLayout(left: number, top: number, right: number, bottom: number): void {
super.onLayout(left, top, right, bottom);
if (this.orientation === enums.Orientation.vertical) {
this.layoutVertical(left, top, right, bottom);
}
else {
this.layoutHorizontal(left, top, right, bottom);
}
}
private layoutVertical(left: number, top: number, right: number, bottom: number): void {
var density = utils.layout.getDisplayDensity();
var paddingLeft = this.paddingLeft * density;
var paddingRight = this.paddingRight * density;
var paddingTop = this.paddingTop * density;
var paddingBottom = this.paddingBottom * density;
var childTop: number;
var childLeft: number = paddingLeft;
var childRight = right - left - paddingRight;
switch (this.verticalAlignment) {
case enums.VerticalAlignment.center:
childTop = (bottom - top - this._totalLength) / 2 + paddingTop - paddingBottom;
break;
case enums.VerticalAlignment.bottom:
childTop = bottom - top - this._totalLength + paddingTop - paddingBottom;
break;
case enums.VerticalAlignment.top:
case enums.VerticalAlignment.stretch:
default:
childTop = paddingTop;
break;
}
var count = this.getChildrenCount();
for (var i = 0; i < count; i++) {
var child = this.getChildAt(i);
if (!child || !child._isVisible) {
continue;
}
var childHeight = child.getMeasuredHeight() + (child.marginTop + child.marginBottom) * density;
view.View.layoutChild(this, child, childLeft, childTop, childRight, childTop + childHeight);
childTop += childHeight;
}
}
private layoutHorizontal(left: number, top: number, right: number, bottom: number): void {
var density = utils.layout.getDisplayDensity();
var paddingLeft = this.paddingLeft * density;
var paddingRight = this.paddingRight * density;
var paddingTop = this.paddingTop * density;
var paddingBottom = this.paddingBottom * density;
var childTop: number = paddingTop;
var childLeft: number;
var childBottom = bottom - top - paddingBottom;
switch (this.horizontalAlignment) {
case enums.HorizontalAlignment.center:
childLeft = (right - left - this._totalLength) / 2 + paddingLeft - paddingRight;
break;
case enums.HorizontalAlignment.right:
childLeft = right - left - this._totalLength + paddingLeft - paddingRight;
break;
case enums.HorizontalAlignment.left:
case enums.HorizontalAlignment.stretch:
default:
childLeft = paddingLeft;
break;
}
var count = this.getChildrenCount();
for (var i = 0; i < count; i++) {
var child = this.getChildAt(i);
if (!child || !child._isVisible) {
continue;
}
var childWidth = child.getMeasuredWidth() + (child.marginLeft + child.marginRight) * density;;
view.View.layoutChild(this, child, childLeft, childTop, childLeft + childWidth, childBottom);
childLeft += childWidth;
}
}
}