private static int chooseHorizontal(android.text.Layout layout, int direction, int off1, int off2) { int line1 = layout.getLineForOffset(off1); int line2 = layout.getLineForOffset(off2); if (line1 == line2) { // same line, so it goes by pure physical direction float h1 = layout.getPrimaryHorizontal(off1); float h2 = layout.getPrimaryHorizontal(off2); if (direction < 0) { // to left if (h1 < h2) { return off1; } else { return off2; } } else { // to right if (h1 > h2) { return off1; } else { return off2; } } } else { // different line, so which line is "left" and which is "right" // depends upon the directionality of the text // This only checks at one end, but it's not clear what the // right thing to do is if the ends don't agree. Even if it // is wrong it should still not be too bad. int line = layout.getLineForOffset(off1); int textdir = layout.getParagraphDirection(line); if (textdir == direction) { return System.Math.Max(off1, off2); } else { return System.Math.Min(off1, off2); } } }
private static int findEdge(android.text.Spannable text, android.text.Layout layout , int dir) { int pt = getSelectionEnd(text); int line = layout.getLineForOffset(pt); int pdir = layout.getParagraphDirection(line); if (dir * pdir < 0) { return layout.getLineStart(line); } else { int end = layout.getLineEnd(line); if (line == layout.getLineCount() - 1) { return end; } else { return end - 1; } } }
/// <summary> /// Move the cursor to the buffer offset physically below the current /// offset, or return false if the cursor is already on the bottom line. /// </summary> /// <remarks> /// Move the cursor to the buffer offset physically below the current /// offset, or return false if the cursor is already on the bottom line. /// </remarks> public static bool moveDown(android.text.Spannable text, android.text.Layout layout ) { int start = getSelectionStart(text); int end = getSelectionEnd(text); if (start != end) { int min = System.Math.Min(start, end); int max = System.Math.Max(start, end); setSelection(text, max); if (min == 0 && max == text.Length) { return false; } return true; } else { int line = layout.getLineForOffset(end); if (line < layout.getLineCount() - 1) { int move; if (layout.getParagraphDirection(line) == layout.getParagraphDirection(line + 1)) { float h = layout.getPrimaryHorizontal(end); move = layout.getOffsetForHorizontal(line + 1, h); } else { move = layout.getLineStart(line + 1); } setSelection(text, move); return true; } } return false; }
/// <summary> /// Move the selection end to the buffer offset physically below /// the current selection end. /// </summary> /// <remarks> /// Move the selection end to the buffer offset physically below /// the current selection end. /// </remarks> public static bool extendDown(android.text.Spannable text, android.text.Layout layout ) { int end = getSelectionEnd(text); int line = layout.getLineForOffset(end); if (line < layout.getLineCount() - 1) { int move; if (layout.getParagraphDirection(line) == layout.getParagraphDirection(line + 1)) { float h = layout.getPrimaryHorizontal(end); move = layout.getOffsetForHorizontal(line + 1, h); } else { move = layout.getLineStart(line + 1); } extendSelection(text, move); return true; } else { if (end != text.Length) { extendSelection(text, text.Length); return true; } } return true; }
private static int getCurrentLineTop(android.text.Spannable buffer, android.text.Layout layout) { return layout.getLineTop(layout.getLineForOffset(android.text.Selection.getSelectionEnd (buffer))); }