如何清除 TLF 中所选内容的格式？答案

【问题标题】：How to clear formatting on a selection in TLF?如何清除 TLF 中所选内容的格式？
【发布时间】：2018-07-14 06:14:43
【问题描述】：

我正在尝试删除所选内容的格式，而我目前仅在所选内容位于段落内时删除所选内容的格式。如果所选内容延伸到另一个段落，则不会删除格式。

这是我目前所拥有的：

var currentFormat:TextLayoutFormat;
var currentParagraphFormat:TextLayoutFormat;
var containerFormat:TextLayoutFormat;
var selectionStart:int;
var selectionEnd:int;
var operationState:SelectionState;
var editManager:IEditManager;

if (richEditableText.textFlow && richEditableText.textFlow.interactionManager is IEditManager) {
    editManager = IEditManager(richEditableText.textFlow.interactionManager);

    selectionStart = Math.min(richEditableText.selectionActivePosition, richEditableText.selectionAnchorPosition);
    selectionEnd = Math.max(richEditableText.selectionActivePosition, richEditableText.selectionAnchorPosition);

    if (operationState == null) {
        operationState = new SelectionState(richEditableText.textFlow, selectionStart, selectionEnd);
    }

    currentFormat = editManager.getCommonCharacterFormat(operationState);
    currentParagraphFormat = editManager.getCommonParagraphFormat(operationState);
    containerFormat = editManager.getCommonContainerFormat(operationState);

    editManager.clearFormat(currentFormat, currentParagraphFormat, containerFormat);

}

【问题讨论】：

标签： actionscript-3 flash apache-flex tlf

【解决方案1】：

似乎SelectionManager.getCommonCharacterFormat() 并没有完全按照我的想法去做。我需要获取所选字符的格式，而该功能似乎没有这样做。

如果我得到一个ElementRange，然后循环遍历它，我可以创建一个TextLayoutFormat，其中包含元素范围内所有叶子的格式。

var currentFormat:TextLayoutFormat;
var currentParagraphFormat:TextLayoutFormat;
var containerFormat:TextLayoutFormat;
var selectionStart:int;
var selectionEnd:int;
var operationState:SelectionState;
var editManager:IEditManager;

if (richEditableText.textFlow && richEditableText.textFlow.interactionManager is IEditManager) {
    editManager = IEditManager(richEditableText.textFlow.interactionManager);

    selectionStart = Math.min(richEditableText.selectionActivePosition, richEditableText.selectionAnchorPosition);
    selectionEnd = Math.max(richEditableText.selectionActivePosition, richEditableText.selectionAnchorPosition);

    if (operationState == null) {
        operationState = new SelectionState(richEditableText.textFlow, selectionStart, selectionEnd);
    }

    // following lines were change
    elementRange = ElementRange.createElementRange(richEditableText.textFlow, selectionStart, selectionEnd);
    currentFormat = getElementRangeFormat(elementRange);

    editManager.clearFormat(currentFormat, currentParagraphFormat, containerFormat);

}

// method to get format of the selected range
public static function getElementRangeFormat(elementRange:ElementRange):TextLayoutFormat {      
    var leaf:FlowLeafElement = elementRange.firstLeaf;
    var attr:TextLayoutFormat = new TextLayoutFormat(leaf.computedFormat);

    for (;;)
    {
        if (leaf == elementRange.lastLeaf)
            break;
        leaf = leaf.getNextLeaf();
        attr.concatInheritOnly(leaf.computedFormat);
    }

    return Property.extractInCategory(TextLayoutFormat, TextLayoutFormat.description, attr, Category.CHARACTER, false) as TextLayoutFormat;
}

【讨论】：