0312 优化richtext 可能闪退的情况

hch

17 小时以前 4a51ed64c51b2eeb67847db23162f4bfeb3d8339

 Main/System/Message/RichText.cs

@@ -504,8 +504,26 @@
            {
                font = FontUtility.preferred;
            }

            // 添加 null 检查
            if (font == null || rectTransform == null || cachedTextGeneratorForLayout == null || string.IsNullOrEmpty(m_OutputText))
            {
                return 0f;
            }

            var settings = GetGenerationSettings(Vector2.zero);
            return cachedTextGeneratorForLayout.GetPreferredWidth(m_OutputText, settings) / pixelsPerUnit;

            float width = 0f;
            try
            {
                width = cachedTextGeneratorForLayout.GetPreferredWidth(m_OutputText, settings) / pixelsPerUnit;
            }
            catch (Exception ex)
            {
                Debug.LogError($"GetPreferredWidth failed: {ex.Message}");
                width = 0f;
            }
            return width;
        }
    }

@@ -517,9 +535,26 @@
            {
                font = FontUtility.preferred;
            }

            // 添加 null 检查
            if (font == null || rectTransform == null || cachedTextGeneratorForLayout == null || string.IsNullOrEmpty(m_OutputText))
            {
                return 0f;
            }

            var settings = GetGenerationSettings(new Vector2(rectTransform.rect.size.x, 0.0f));
            float _height = cachedTextGeneratorForLayout.GetPreferredHeight(m_OutputText, settings) / pixelsPerUnit;
            return _height;

            float height = 0f;
            try
            {
                height = cachedTextGeneratorForLayout.GetPreferredHeight(m_OutputText, settings) / pixelsPerUnit;
            }
            catch (Exception ex)
            {
                Debug.LogError($"GetPreferredHeight failed: {ex.Message}");
                height = 0f;
            }
            return height;
        }
    }
    #endregion
@@ -666,6 +701,9 @@

    private Dictionary<int, Match> matchDics = new Dictionary<int, Match>();

    // 字符宽度缓存，避免重复计算相同字符
    private Dictionary<string, float> charWidthCache = new Dictionary<string, float>();

    private bool IsModifySize(int _index,out int _size)
    {
        _size = 0;
@@ -724,6 +762,14 @@
        {
            font = FontUtility.preferred;
        }

        // 添加 null 检查
        if (font == null || rectTransform == null || cachedTextGeneratorForLayout == null)
        {
            Debug.LogWarning("SetFitterSize: font, rectTransform or cachedTextGeneratorForLayout is null");
            return;
        }

        var settings = GetGenerationSettings(Vector2.zero);

        float cache = 0;
@@ -732,6 +778,7 @@
        float ratio = GetResolutionRatio();

        matchDics.Clear();
        charWidthCache.Clear();

        foreach (Match match in ImgAnalysis.Unity_Img_Regex.Matches(fitterText))
        {
@@ -802,7 +849,8 @@
                }
                else
                {
                    cache = cachedTextGeneratorForLayout.GetPreferredWidth(match.Value, settings) * ratio;
                    cache = GetCharWidthCached(match.Value, settings, ratio);

                    if (width + cache > (rectTransform.rect.width - 5))
                    {
                        CacluHrefAndImgIndex(Mathf.Max(0, i - 1));
@@ -820,19 +868,16 @@
            else
            {
                var _size = 0;
                var _cacheFontSize = fontSize;
                // 不再修改 fontSize，使用临时 TextGenerator 计算不同字号的宽度
                if (_modifySize && IsModifySize(i, out _size))
                {
                    fontSize = _size;
                    settings = GetGenerationSettings(Vector2.zero);
                    cache = cachedTextGeneratorForLayout.GetPreferredWidth(fitterText[i].ToString(), settings) * ratio;
                    fontSize = _cacheFontSize;
                    settings = GetGenerationSettings(Vector2.zero);
                    cache = GetCharWidthWithCustomSize(fitterText[i], _size, ratio);
                }
                else
                {
                    cache = cachedTextGeneratorForLayout.GetPreferredWidth(fitterText[i].ToString(), settings) * ratio;
                    cache = GetCharWidthCached(fitterText[i].ToString(), settings, ratio);
                }

                if (width + cache > (rectTransform.rect.width - 5))
                {
                    CacluHrefAndImgIndex(Mathf.Max(0, i - 1));
@@ -850,6 +895,65 @@
        m_OutputText = textBuilder.ToString();
    }

    /// <summary>
    /// 获取字符宽度（带缓存）
    /// </summary>
    private float GetCharWidthCached(string charStr, TextGenerationSettings settings, float ratio)
    {
        string cacheKey = $"{fontSize}_{charStr}";

        if (charWidthCache.ContainsKey(cacheKey))
        {
            return charWidthCache[cacheKey];
        }

        float width = 0;
        try
        {
            width = cachedTextGeneratorForLayout.GetPreferredWidth(charStr, settings) * ratio;
        }
        catch (Exception ex)
        {
            Debug.LogError($"GetPreferredWidth failed for '{charStr}': {ex.Message}");
            width = 0;
        }

        charWidthCache[cacheKey] = width;
        return width;
    }

    /// <summary>
    /// 使用自定义字号计算字符宽度（不修改原始 Text 组件的 fontSize）
    /// </summary>
    private float GetCharWidthWithCustomSize(char c, int customFontSize, float ratio)
    {
        string charStr = c.ToString();
        string cacheKey = $"{customFontSize}_{charStr}";

        if (charWidthCache.ContainsKey(cacheKey))
        {
            return charWidthCache[cacheKey];
        }

        float width = 0;
        try
        {
            // 创建临时的 TextGenerationSettings，使用自定义字号
            TextGenerationSettings tempSettings = GetGenerationSettings(Vector2.zero);
            tempSettings.fontSize = customFontSize;

            width = cachedTextGeneratorForLayout.GetPreferredWidth(charStr, tempSettings) * ratio;
        }
        catch (Exception ex)
        {
            Debug.LogError($"GetPreferredWidth failed for '{charStr}' with fontSize {customFontSize}: {ex.Message}");
            width = 0;
        }

        charWidthCache[cacheKey] = width;
        return width;
    }

    private void CacluHrefAndImgIndex(int index)
    {
        for (int i = 0; i < m_ImgList.Count; i++)