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Annotation of Examples/AppKit/ScrollDoodScroll/CustomCell.m, revision 1.1

1.1     ! root        1: // CustomCell.m
        !             2: // By Jayson Adams, NeXT Developer Support Team
        !             3: // You may freely copy, distribute and reuse the code in this example.
        !             4: // NeXT disclaims any warranty of any kind, expressed or implied, as to its
        !             5: // fitness for any particular use.
        !             6: 
        !             7: // This subclass of cell draws a dot image to the right of the text
        !             8: // and provides fancy, printable highlighting.
        !             9: 
        !            10: #import <appkit/appkit.h>
        !            11: #import "CustomCell.h"
        !            12: 
        !            13: @implementation CustomCell
        !            14: 
        !            15:   
        !            16: #define IMAGEMARGIN 4.0
        !            17:   
        !            18: - drawInside:(const NXRect *)cellFrame inView:controlView
        !            19: {
        !            20:     /* every CustomCell needs these two */
        !            21:     static id dotImage = nil;
        !            22:     static id sharedTextCell = nil;
        !            23: 
        !            24:     NXRect rect = *cellFrame;
        !            25:     NXPoint imageOrigin;
        !            26:     NXSize dotSize;
        !            27:         
        !            28:     if (!dotImage) {
        !            29:        dotImage = [NXImage findImageNamed:"Dot"];
        !            30:     }
        !            31:     [dotImage getSize:&dotSize];
        !            32: 
        !            33:   /* erase the cell */
        !            34:     PSsetgray((cFlags1.state || cFlags1.highlighted) ? NX_WHITE : NX_LTGRAY);
        !            35:     NXRectFill(cellFrame);
        !            36: 
        !            37:   /* draw the "attachment" image */
        !            38:     imageOrigin.x = NX_X(cellFrame) + IMAGEMARGIN;
        !            39:     imageOrigin.y = NX_Y(cellFrame) + NX_HEIGHT(cellFrame) -
        !            40:                    (NX_HEIGHT(cellFrame) - dotSize.height) / 2.0;
        !            41: 
        !            42:     [dotImage composite:NX_SOVER toPoint:&imageOrigin];
        !            43:       
        !            44:     NX_WIDTH(&rect) -= (dotSize.width + IMAGEMARGIN * 2.0 - NX_X(&rect));
        !            45:     NX_X(&rect) += dotSize.width + IMAGEMARGIN * 2.0;
        !            46: 
        !            47:     if (!sharedTextCell) {
        !            48:         sharedTextCell = [[Cell alloc] init];
        !            49:        [sharedTextCell setWrap:NO];
        !            50:     }
        !            51:     [sharedTextCell setFont:[self font]];
        !            52:     [sharedTextCell setStringValue:[self stringValue]];
        !            53:     [sharedTextCell drawInside:&rect inView:controlView];
        !            54:     
        !            55:   /* all drawing from now on will be in dark gray */
        !            56:     PSsetgray(NX_DKGRAY);
        !            57:     
        !            58:   /* draw the two dark gray lines above and below the cell */
        !            59:     if (cFlags1.state || cFlags1.highlighted) {
        !            60:         NXRect rectArray[2];
        !            61:       /*
        !            62:        * draw 1-pixel tall rectangles instead of lines (this is faster than
        !            63:        * PSmoveto(); PSlineto()).
        !            64:        */
        !            65:        NXSetRect(&(rectArray[0]), NX_X(cellFrame), NX_Y(cellFrame),
        !            66:                NX_WIDTH(cellFrame), 1.0);
        !            67:        NXSetRect(&(rectArray[1]), NX_X(cellFrame), NX_MAXY(cellFrame) - 1.0,
        !            68:                NX_WIDTH(cellFrame), 1.0);
        !            69: 
        !            70:       /* using NXRectFillList is faster than separate calls to NXRectFill */
        !            71:        NXRectFillList(rectArray, 2);
        !            72:     }
        !            73: 
        !            74:     return self;
        !            75: }
        !            76: 
        !            77: - highlight:(const NXRect *)cellFrame inView:controlView lit:(BOOL)flag
        !            78: {
        !            79:     if (cFlags1.highlighted != flag) {
        !            80:        cFlags1.highlighted = flag;
        !            81:        [self drawInside:cellFrame inView:controlView];
        !            82:     }
        !            83:     return self;
        !            84: }
        !            85: 
        !            86: @end

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