Repository: flex-utilities Updated Branches: refs/heads/master 8bab45d41 -> e1f9d1df0
http://git-wip-us.apache.org/repos/asf/flex-utilities/blob/e1f9d1df/TourDeFlex/TourDeFlex3/src/spark/layouts/HBaselineLayout.as ---------------------------------------------------------------------- diff --git a/TourDeFlex/TourDeFlex3/src/spark/layouts/HBaselineLayout.as b/TourDeFlex/TourDeFlex3/src/spark/layouts/HBaselineLayout.as new file mode 100644 index 0000000..5d87ce7 --- /dev/null +++ b/TourDeFlex/TourDeFlex3/src/spark/layouts/HBaselineLayout.as @@ -0,0 +1,199 @@ +//////////////////////////////////////////////////////////////////////////////// +// +// Licensed to the Apache Software Foundation (ASF) under one or more +// contributor license agreements. See the NOTICE file distributed with +// this work for additional information regarding copyright ownership. +// The ASF licenses this file to You under the Apache License, Version 2.0 +// (the "License"); you may not use this file except in compliance with +// the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +//////////////////////////////////////////////////////////////////////////////// +package { + +import mx.core.ILayoutElement; +import mx.events.PropertyChangeEvent; +import mx.formatters.NumberBase; + +import spark.components.supportClasses.GroupBase; +import spark.layouts.HorizontalLayout; + +public class HBaselineLayout extends HorizontalLayout +{ + public function HBaselineLayout() + { + super(); + } + + //---------------------------------- + // globalBaseline + //---------------------------------- + + [Inspectable(category="General")] + + private var _globalBaseline:Number = NaN; + public function get globalBaseline():Number + { + return _globalBaseline; + } + + public function set globalBaseline(value:Number):void + { + _globalBaseline = value; + var target:GroupBase = this.target; + if (target) + { + target.invalidateSize(); + target.invalidateDisplayList(); + } + } + + //---------------------------------- + // actualBaseline + //---------------------------------- + + private var _actualBaseline:Number; + + [Bindable("propertyChange")] + [Inspectable(category="General")] + + public function get actualBaseline():Number + { + return _actualBaseline; + } + + private function setActualBaseline(value:Number):void + { + if (value == _actualBaseline) + return; + + var oldValue:Number = _actualBaseline; + _actualBaseline = value; + dispatchEvent(PropertyChangeEvent.createUpdateEvent(this, "actualBaseline", oldValue, value)); + } + + //---------------------------------- + // verticalAlign + //---------------------------------- + + [Inspectable(category="General", enumeration="top,bottom,middle,justify,contentJustify,baseline", defaultValue="top")] + override public function get verticalAlign():String + { + return super.verticalAlign; + } + + /** + * @private + */ + override public function measure():void + { + super.measure(); + + var target:GroupBase = this.target; + if (!target || verticalAlign != "baseline") + return; + + measureBaseline(true /*usePreferredSize*/); + if (!isNaN(_globalBaseline)) + measuredBaselineTop = _globalBaseline; + + // The measured height is the sum of the space above and below the baseline + if (isNaN(paddingTop)) + measuredBaselineTop += paddingTop; + if (isNaN(paddingBottom)) + measuredBaselineBottom += paddingBottom; + target.measuredHeight = Math.round(measuredBaselineTop + measuredBaselineBottom); + } + + /** + * @private + */ + override public function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void + { + super.updateDisplayList(unscaledWidth, unscaledHeight); + + var target:GroupBase = this.target; + if (!target || verticalAlign != "baseline") + return; + + measureBaseline(false /*usePreferredSize*/); + if (!isNaN(_globalBaseline)) + measuredBaselineTop = _globalBaseline; + + if (isNaN(paddingTop)) + measuredBaselineTop += paddingTop; + + // Adjust the position of the elements + var contentHeight:Number = 0; + var count:int = target.numElements; + for (var i:int = 0; i < count; i++) + { + var element:ILayoutElement = target.getElementAt(i); + if (!element || !element.includeInLayout) + continue; + + var elementBaseline:Number = element.baseline as Number; + if (isNaN(elementBaseline)) + elementBaseline = 0; + + var baselinePosition:Number = element.baselinePosition; + var y:Number = measuredBaselineTop + (elementBaseline - baselinePosition); + element.setLayoutBoundsPosition(element.getLayoutBoundsX(), y); + contentHeight = Math.max(contentHeight, element.getLayoutBoundsHeight() + y); + } + + // Adjust the content height + if (isNaN(paddingBottom)) + contentHeight += paddingBottom; + target.setContentSize(target.contentWidth, contentHeight); + + // Update the baseline + setActualBaseline(measuredBaselineTop); + } + + private var measuredBaselineTop:Number = 0; // How much space is needed above the baseline to fit all the elements + private var measuredBaselineBottom:Number = 0; // How much space is needed below the baseline to fit all the elements + + /** + * @private + */ + private function measureBaseline(usePreferredSize:Boolean):void + { + var elementBaseline:Number = 0; // The current element's explicit baseline constraint + var elementBaselineTop:Number = 0; // The portiono of the current element that's above the baseline + var elementBaselineBottom:Number = 0; // The portion of the current element that's below the baseline + + measuredBaselineTop = 0; + measuredBaselineBottom = 0; + + var count:int = target.numElements; + for (var i:int = 0; i < count; i++) + { + var element:ILayoutElement = target.getElementAt(i); + if (!element || !element.includeInLayout) + continue; + + var elementHeight:Number = usePreferredSize ? element.getPreferredBoundsHeight() : + element.getLayoutBoundsHeight(); + elementBaseline = element.baseline as Number; + if (isNaN(elementBaseline)) + elementBaseline = 0; + + var baselinePosition:Number = element.baselinePosition; + + elementBaselineTop = baselinePosition - elementBaseline; + elementBaselineBottom = elementHeight - elementBaselineTop; + + measuredBaselineTop = Math.max(elementBaselineTop, measuredBaselineTop); + measuredBaselineBottom = Math.max(elementBaselineBottom, measuredBaselineBottom); + } + } +} +} \ No newline at end of file
