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Annotation of Examples/AppKit/Draw/textUndo.subproj/TextSelChange.m, revision 1.1

1.1     ! root        1: #import "textundo.h"
        !             2: 
        !             3: @implementation TextSelChange
        !             4: 
        !             5: /*
        !             6:  * The TextSelChange is the workhorse of undoable text. It records the
        !             7:  * contents of the selection (via TextSelection objects) before and after
        !             8:  * a change is made. By alternately installing and removing the old and new
        !             9:  * selections, the original change can be undone and redone.
        !            10:  */
        !            11: 
        !            12: - initView:aView name:(const char *)str
        !            13: {
        !            14:     [super initView:aView];
        !            15: 
        !            16:     oldSel = nil;
        !            17:     newSel = nil;
        !            18: 
        !            19:     name = str;
        !            20: 
        !            21:     return self;
        !            22: }
        !            23: 
        !            24: - free
        !            25: {
        !            26:     if (newSel) {
        !            27:        [newSel free];
        !            28:     }
        !            29: 
        !            30:     if (oldSel) {
        !            31:        [oldSel free];
        !            32:     }
        !            33: 
        !            34:     return [super free];
        !            35: }
        !            36: 
        !            37: - (const char *)changeName
        !            38: {
        !            39:     return name;
        !            40: }
        !            41: 
        !            42: - saveAfterChange
        !            43: {
        !            44:     newSel = [[[TextSelection alloc] initText:textView] capture];
        !            45:     return self;
        !            46: }
        !            47: 
        !            48: - saveBeforeChange
        !            49: {
        !            50:     NXSelPt start, end;
        !            51: 
        !            52:     [textView getSel:&start :&end];
        !            53:     selStart = start.cp;
        !            54:     selEnd = end.cp;
        !            55: 
        !            56:     oldSel = [TextSelection alloc];
        !            57:     [[oldSel initText:textView start:selStart end:selEnd] capture];
        !            58:     [oldSel setClickCount:[newSel clickCount]];
        !            59: 
        !            60:     return self;
        !            61: }
        !            62: 
        !            63: - undoChange
        !            64: {
        !            65:     [[textView window] disableFlushWindow];
        !            66:     [newSel remove];
        !            67:     [oldSel install];
        !            68:     [[[textView window] reenableFlushWindow] flushWindow];
        !            69:     
        !            70:     return [super undoChange];
        !            71: }
        !            72: 
        !            73: - redoChange
        !            74: {
        !            75:     NXRect oldBounds, invalidRect;
        !            76:     id delegate;
        !            77: 
        !            78:     [[textView window] disableFlushWindow];
        !            79: 
        !            80:     if (delegate = [textView delegate]) {
        !            81:        [textView getBounds:&oldBounds];
        !            82:        invalidRect = oldBounds;
        !            83:        invalidRect.size.width = 0.0;
        !            84:        invalidRect.size.height = 0.0;
        !            85:     } else {
        !            86:        delegate = nil;
        !            87:     }
        !            88: 
        !            89:     [oldSel remove];
        !            90:     [newSel install];
        !            91: 
        !            92:     if (delegate != nil &&
        !            93:        [delegate respondsTo:@selector(textDidResize:oldBounds:invalid:)])
        !            94:     {
        !            95:        [delegate textDidResize:textView
        !            96:                       oldBounds:&oldBounds
        !            97:                         invalid:&invalidRect];
        !            98:     }
        !            99: 
        !           100:     [[[textView window] reenableFlushWindow] flushWindow];
        !           101: 
        !           102:     return [super redoChange];
        !           103: }
        !           104: 
        !           105: @end

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