Java 类android.text.TextDirectionHeuristics 实例源码

TextDirectionHeuristic getTextDirectionHeuristic() {
    if (hasPasswordTransformationMethod()) {
        // passwords fields should be LTR
        return TextDirectionHeuristics.LTR;
    }

    // Always need to resolve layout direction first
    final boolean defaultIsRtl = (getLayoutDirection() == LAYOUT_DIRECTION_RTL);

    // Now, we can select the heuristic
    switch (getTextDirection()) {
        default:
        case TEXT_DIRECTION_FIRST_STRONG:
            return (defaultIsRtl ? TextDirectionHeuristics.FIRSTSTRONG_RTL :
                    TextDirectionHeuristics.FIRSTSTRONG_LTR);
        case TEXT_DIRECTION_ANY_RTL:
            return TextDirectionHeuristics.ANYRTL_LTR;
        case TEXT_DIRECTION_LTR:
            return TextDirectionHeuristics.LTR;
        case TEXT_DIRECTION_RTL:
            return TextDirectionHeuristics.RTL;
        case TEXT_DIRECTION_LOCALE:
            return TextDirectionHeuristics.LOCALE;
    }
}

public static void init() {
    if (initialized) {
        return;
    }

    try {
        final Class<?> textDirClass;
        if (Build.VERSION.SDK_INT >= 18) {
            textDirClass = TextDirectionHeuristic.class;
            sTextDirection = TextDirectionHeuristics.FIRSTSTRONG_LTR;
        } else {
            ClassLoader loader = StaticLayoutEx.class.getClassLoader();
            textDirClass = loader.loadClass(TEXT_DIR_CLASS);
            Class<?> textDirsClass = loader.loadClass(TEXT_DIRS_CLASS);
            sTextDirection = textDirsClass.getField(TEXT_DIR_FIRSTSTRONG_LTR).get(textDirsClass);
        }

        final Class<?>[] signature = new Class[]{
                CharSequence.class,
                int.class,
                int.class,
                TextPaint.class,
                int.class,
                Layout.Alignment.class,
                textDirClass,
                float.class,
                float.class,
                boolean.class,
                TextUtils.TruncateAt.class,
                int.class,
                int.class
        };

        sConstructor = StaticLayout.class.getDeclaredConstructor(signature);
        sConstructor.setAccessible(true);
        sConstructorArgs = new Object[signature.length];
        initialized = true;
    } catch (Throwable e) {
        FileLog.e("tmessages", e);
    }
}

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
public void initLayout(Context context, CharSequence source, CharSequence longString) {

  textPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
  textPaint.density = context.getResources().getDisplayMetrics().density;
  textPaint.setTextSize(Util.fromDPtoPix(context, Util.TEXT_SIZE_DP));

  textDir = TextDirectionHeuristics.LTR;

  alignment = Layout.Alignment.ALIGN_NORMAL;

  hardCodeWidth = Util.getScreenWidth(context);

  longStringLayout = new StaticLayout(longString, textPaint, hardCodeWidth, alignment, 1.0f, 0f, true);

  dummyCanvas = new Canvas();

  longStringLayout.draw(dummyCanvas);

  for (int i = 0; i < layout.length; i++) {
    layout[i] = new StaticLayout(TestSpan.getSpanString(i), textPaint, hardCodeWidth, alignment, 1.0f, 0f, true);
    layout[i].draw(dummyCanvas);
  }
}

public static void init() {
    if (initialized) {
        return;
    }

    try {
        final Class<?> textDirClass;
        if (Build.VERSION.SDK_INT >= 18) {
            textDirClass = TextDirectionHeuristic.class;
            sTextDirection = TextDirectionHeuristics.FIRSTSTRONG_LTR;
        } else {
            ClassLoader loader = StaticLayoutEx.class.getClassLoader();
            textDirClass = loader.loadClass(TEXT_DIR_CLASS);
            Class<?> textDirsClass = loader.loadClass(TEXT_DIRS_CLASS);
            sTextDirection = textDirsClass.getField(TEXT_DIR_FIRSTSTRONG_LTR).get(textDirsClass);
        }

        final Class<?>[] signature = new Class[]{
                CharSequence.class,
                int.class,
                int.class,
                TextPaint.class,
                int.class,
                Layout.Alignment.class,
                textDirClass,
                float.class,
                float.class,
                boolean.class,
                TextUtils.TruncateAt.class,
                int.class,
                int.class
        };

        sConstructor = StaticLayout.class.getDeclaredConstructor(signature);
        sConstructor.setAccessible(true);
        sConstructorArgs = new Object[signature.length];
        initialized = true;
    } catch (Throwable e) {
        FileLog.e("tmessages", e);
    }
}

@TargetApi(JELLY_BEAN_MR1)
@CheckResult
private boolean needMirroring() {
    if (!mirrorable) return false;

    // Passwords fields should be LTR
    if (view.getTransformationMethod() instanceof PasswordTransformationMethod) {
        return false;
    }

    // Always need to resolve layout direction first
    final boolean defaultIsRtl = view.getLayoutDirection() == LAYOUT_DIRECTION_RTL;

    if (SDK_INT < JELLY_BEAN_MR2) {
        return defaultIsRtl;
    }

    // Select the text direction heuristic according to the
    // package-private getTextDirectionHeuristic() method in TextView
    TextDirectionHeuristic textDirectionHeuristic;
    switch (view.getTextDirection()) {
        default:
        case TEXT_DIRECTION_FIRST_STRONG:
            textDirectionHeuristic = defaultIsRtl ?
                    TextDirectionHeuristics.FIRSTSTRONG_RTL :
                    TextDirectionHeuristics.FIRSTSTRONG_LTR;
            break;
        case TEXT_DIRECTION_ANY_RTL:
            textDirectionHeuristic = TextDirectionHeuristics.ANYRTL_LTR;
            break;
        case TEXT_DIRECTION_LTR:
            textDirectionHeuristic = TextDirectionHeuristics.LTR;
            break;
        case TEXT_DIRECTION_RTL:
            textDirectionHeuristic = TextDirectionHeuristics.RTL;
            break;
        case TEXT_DIRECTION_LOCALE:
            textDirectionHeuristic = TextDirectionHeuristics.LOCALE;
            break;
        case TEXT_DIRECTION_FIRST_STRONG_LTR:
            textDirectionHeuristic = TextDirectionHeuristics.FIRSTSTRONG_LTR;
            break;
        case TEXT_DIRECTION_FIRST_STRONG_RTL:
            textDirectionHeuristic = TextDirectionHeuristics.FIRSTSTRONG_RTL;
            break;
    }
    CharSequence text = view.getText();
    return textDirectionHeuristic.isRtl(text, 0, text.length());
}

public static void init() {
    if (initialized) {
        return;
    }

    try {
        final Class<?> textDirClass;
        if (Build.VERSION.SDK_INT >= 18) {
            textDirClass = TextDirectionHeuristic.class;
            sTextDirection = TextDirectionHeuristics.FIRSTSTRONG_LTR;
        } else {
            ClassLoader loader = StaticLayoutEx.class.getClassLoader();
            textDirClass = loader.loadClass(TEXT_DIR_CLASS);
            Class<?> textDirsClass = loader.loadClass(TEXT_DIRS_CLASS);
            sTextDirection = textDirsClass.getField(TEXT_DIR_FIRSTSTRONG_LTR).get(textDirsClass);
        }

        final Class<?>[] signature = new Class[]{
                CharSequence.class,
                int.class,
                int.class,
                TextPaint.class,
                int.class,
                Layout.Alignment.class,
                textDirClass,
                float.class,
                float.class,
                boolean.class,
                TextUtils.TruncateAt.class,
                int.class,
                int.class
        };

        sConstructor = StaticLayout.class.getDeclaredConstructor(signature);
        sConstructor.setAccessible(true);
        sConstructorArgs = new Object[signature.length];
        initialized = true;
    } catch (Throwable e) {
        FileLog.e(e);
    }
}