NOVA - For the NeXT Workstation/NOVA - For the NeXT Workstation.iso/SourceCode/AdobeExamples/NX_Binary/DocView.m

Text File | 1992-12-19 | 10.6 KB | 425 lines

/*
 * (a)  (C) 1990 by Adobe Systems Incorporated. All rights reserved.
 *
 * (b)  If this Sample Code is distributed as part of the Display PostScript
 *    System Software Development Kit from Adobe Systems Incorporated,
 *    then this copy is designated as Development Software and its use is
 *    subject to the terms of the License Agreement attached to such Kit.
 *
 * (c)  If this Sample Code is distributed independently, then the following
 *    terms apply:
 *
 * (d)  This file may be freely copied and redistributed as long as:
 *    1) Parts (a), (d), (e) and (f) continue to be included in the file,
 *    2) If the file has been modified in any way, a notice of such
 *      modification is conspicuously indicated.
 *
 * (e)  PostScript, Display PostScript, and Adobe are registered trademarks of
 *    Adobe Systems Incorporated.
 *
 * (f) THE INFORMATION BELOW IS FURNISHED AS IS, IS SUBJECT TO
 *    CHANGE WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED
 *    AS A COMMITMENT BY ADOBE SYSTEMS INCORPORATED.
 *    ADOBE SYSTEMS INCORPORATED ASSUMES NO RESPONSIBILITY
 *    OR LIABILITY FOR ANY ERRORS OR INACCURACIES, MAKES NO
 *    WARRANTY OF ANY KIND (EXPRESS, IMPLIED OR STATUTORY)
 *    WITH RESPECT TO THIS INFORMATION, AND EXPRESSLY
 *    DISCLAIMS ANY AND ALL WARRANTIES OF MERCHANTABILITY,
 *    FITNESS FOR PARTICULAR PURPOSES AND NONINFRINGEMENT
 *    OF THIRD PARTY RIGHTS.
 */

/*
 *    DocView.m
 *
 *    This class handles the scaling of the drawing view. It repositions
 *    The drawing view within itself if the drawing view is smaller than the
 *    size of the clip view. The size of the doc view is:
 *    MAX(clip view frame, drawing view frame).
 *
 *    Version:    2.0
 *    Author:    Ken Fromm
 *    History:
 *            03-07-91        Added this comment.
 */

#import "DocView.h"

#import <appkit/NXCursor.h>
#import <appkit/NXImage.h>
#import <appkit/Matrix.h>
#import <appkit/ScrollView.h>
#import <dpsclient/wraps.h>
#import <appkit/nextstd.h>

@implementation DocView

/*
*    Since there is only one subview its easier to keep track of it as an
*    instance variable rather than in the subview list.  Returns any the
*    previous drawing view.
*/
- addDrawView:subView
{
    id        oldView;

    oldView = drawviewId;
    [oldView  removeFromSuperview];

    [self  addSubview:subView];
    drawviewId = subView;

    return oldView;
}

- setZoomControl:anObject
{
    zoomControl = anObject;

    return self;
}

- zoomControl
{
    return zoomControl;
}

- setHitSetting:(float) value
{
    hitsetting = value;

    return self;
}

/*
*    Scale the hit setting. Using an unscaled hit setting would be like
*    using a boxing glove on a 400% scale.
*/
- (float) hitSetting
{
    return hitsetting * (1.0/scale);
}

- setScale:(float)value
{
    scale = value;

    return self;
}

- (float) scale
{
    return  scale;
}

- (BOOL) isZooming
{
    return zooming;
}

/*
*    Check whether the frame of the drawingview is in the rectangle passed in.
*    If drop is true, then include the linewidth and the drop shadow as part of the
*    drawingview frame.
*/
- getDrawViewInRect:(const NXRect *) aRect  withDrop:(BOOL) drop
{
    id        aView = NULL;

    NXRect    viewRect, dropRect;

    [drawviewId  getFrame:&viewRect];
    if (drop)
    {
        dropRect = viewRect;
        NXOffsetRect(&dropRect, rint(OFFSET * scale), rint(-OFFSET * scale));
        NXOffsetRect(&viewRect, rint(LINEWIDTH/2 * scale), rint(LINEWIDTH/2 * scale));
        NXUnionRect(&dropRect, &viewRect);
    }
    if (NXIntersectsRect(aRect, &viewRect))
        aView = drawviewId;

    return  aView;
}

/*
*    This method is overridden from the View class. When the
*    user is zooming the cursor rect for the zoom cursor is set
*    the the frame of the drawing view.
*/
- resetCursorRects
{
    id            imageId, visView;

    NXPoint        hotspot;

    NXRect        cursorRect, visRect;

    if (zooming)
    {
        if (!zoomCursor)
        {
            hotspot.x = hotspot.y = 8.0;
            imageId = [NXImage  newFromSection:"zoom.tiff"];
            zoomCursor = [NXCursor  newFromImage:imageId];
            [zoomCursor setHotSpot:&hotspot];
        }

        [self getVisibleRect:&visRect];
        visView = [self getDrawViewInRect:&visRect  withDrop:NO];
        if (visView)
        {
            [visView getFrame:&cursorRect];
            NXIntersectionRect(&visRect, &cursorRect);
            [self addCursorRect:&cursorRect  cursor:zoomCursor];
        }
        else
            zooming = NO;
    }

    return self;
}

/*
*    Messaged from the zoom matrix. Starts the zoom loop. At the next
*    mouse down in the drawing view, the scaleDrawView:toPoint: method
*    will be called.
*/
- zoom:sender
{
    zooming = YES;
    [self  setZoomControl:sender];
    [self  resetCursorRects];

    [window makeKeyAndOrderFront:self];

    return self;
}

/*
*    Sizes the drawing view from the old scale to the newscale.
*    The frame of the view is used instead of the bounds because
*    the bound will always be the same whereas the frame will
*    provide the size in default coordinates.
*/
- sizeView:viewId withScale:(float) newscale
{
    float            scalefactor, sizewidth, sizeheight;

    NXRect        viewFrame;

    [viewId  getFrame:&viewFrame];
    scalefactor = newscale/scale;
    sizewidth = viewFrame.size.width*scalefactor;
    sizeheight = viewFrame.size.height*scalefactor;
    [viewId sizeTo:rint(sizewidth) :rint(sizeheight)];

    return self;
}

/*
*    Scales the drawing view from the old scale to the new scale.
*    The scale method is relative so we use the ratio
*    of the old scale to the new scale to obtain the scaling factor.
*/
- scaleView:viewId  withScale:(float) newscale
{
    float     scalefactor;

    scalefactor = newscale/scale;
    [viewId scale:scalefactor  :scalefactor];

    return self;
}

/*
*    Place the view passed in in the center of the doc view
*    if it is smaller than the size of the ClipView. Two passes are made
*    through the loop because adding or removing a horizontal or
*    vertical scrollbar will affect the size of the remaining dimension .
*/
- placeView:viewId
{
    BOOL        vert = NO, horiz = NO, done = NO;

    int            passes = 0, border_type;

    float            margin;

    NXSize        contSize, newSize, insetSize, delta;

    NXRect         viewFrame, scrollFrame;

    margin = 4 * OFFSET * scale;

    [viewId  getFrame:&viewFrame];
    [[superview superview]  getFrame:&scrollFrame];
    border_type = [[superview superview]  borderType];

    while (!done && ++passes <= 2)
    {
        [ScrollView getContentSize:&contSize forFrameSize:&scrollFrame.size
            horizScroller:horiz  vertScroller:vert borderType:border_type];

        newSize.width = MAX(viewFrame.size.width, contSize.width);
        newSize.height = MAX(viewFrame.size.height, contSize.height);

        delta.width = newSize.width - viewFrame.size.width;
        delta.height = newSize.height - viewFrame.size.height;
        if (delta.width != 0.0 || delta.height != 0.0)
        {
            if (delta.width < margin)
                newSize.width += margin - delta.width;
            if (delta.height < margin)
                newSize.height += margin - delta.height;
        }

        horiz = (newSize.width != contSize.width);
        vert = (newSize.height != contSize.height);
        if ((horiz && vert) || (!horiz && !vert))
            done = YES;
        else
            done = NO;
    }

    [self  sizeTo:newSize.width  :newSize.height];

    insetSize.width = floor((newSize.width - viewFrame.size.width)/2);
    insetSize.height =  floor((newSize.height - viewFrame.size.height)/2);
    [viewId  moveTo:insetSize.width  :insetSize.height];
    if (insetSize.width != 0 || insetSize.height != 0)
        [viewId  setClipping:YES];
    else
        [viewId setClipping:NO];

    if (horiz)
        [[superview superview] setHorizScrollerRequired:YES];
    else
        [[superview superview] setHorizScrollerRequired:NO];

    if (vert)
        [[superview superview] setVertScrollerRequired:YES];
    else
        [[superview superview] setVertScrollerRequired:NO];

    return self;
}

/*
*    Scales the view to the tag of the selected matrix cell and then
*    scrolls to the point. The point is in window coordinates so
*    it must be converted to the drawing view  coordinates in order
*    to position it in the same relative place in the view.
*/
- scaleDrawView:hitView  toPoint:(NXPoint *) p;
{
    float            newscale;

    NXPoint        viewPt;

    [window invalidateCursorRectsForView:self];
    newscale = [zoomControl  selectedTag] * 0.01;
    if (hitView && newscale != scale)
    {
        viewPt = *p;
        [self convertPoint:&viewPt fromView:nil];
        [self convertPoint:&viewPt  toView:hitView];
        [window disableDisplay];
            /* Size and then scale the drawing view. The frame of the */
            /* drawing view must reflect the changed size. Scaling */
            /* alone will not change the frame. */
            [self  sizeView:hitView  withScale:newscale];
            [self  scaleView:hitView  withScale:newscale];
            [self  setScale:newscale];

            [self  placeView:hitView];
            [self  scrollPoint:&viewPt  inView:hitView  to:p];
        [window reenableDisplay];
        [[window contentView]  display];
    }
    zooming = NO;

    return self;
}


/*
 *    Use the point location relative to the window versus the point relative
 *    to the drawing view (before the scale) to determine where to scroll
 *    the drawing view. We want the same location in the drawing view to
 *    appear where the mouse downed occurred.  The window coordinates
 *    are used and then adjusted by the position of the scrolling frame
 *    because the presence or absence of scrollbars throws the use
 *    of the doc views coordinates awry.
 */
- scrollPoint:(const NXPoint *) aPt  inView:hitView  to:(const NXPoint *) windowPt
{
    NXPoint        viewPt;

    NXSize        contSize;

    NXRect         viewFrame, visRect, scrollFrame;

    [[superview superview]  getContentSize:&contSize];
    [hitView  getFrame:&viewFrame];

    if (viewFrame.size.width > contSize.width || viewFrame.size.height > contSize.height)
    {
        viewPt = *aPt;
        [self  convertPoint:&viewPt  fromView:hitView];
        [self getVisibleRect:&visRect];
        [[superview superview] getFrame:&scrollFrame];

        if (viewFrame.size.width > contSize.width)
            viewPt.x  -= windowPt->x - (scrollFrame.origin.x +scrollFrame.size.width -
                            visRect.size.width);

        if (viewFrame.size.height > contSize.height)
            viewPt.y  -= windowPt->y - (scrollFrame.origin.y + scrollFrame.size.height -
                            visRect.size.height);

        [self  scrollPoint:&viewPt];
    }

    return self;
}

/*
 * This drawSelf method draws a border around the drawing view as well as a
 * drop shadow.  This is only done if it will be visible however. We tell if it is visible
 * if the rectangle passed in is not contained entirely within drawingView frame.
*/
- drawSelf:(NXRect *)r :(int) count
{
    id            visView;

    NXRect        drawRect, dropRect;

    visView = [self getDrawViewInRect:r  withDrop:YES];
    if (visView)
    {
        [visView  getFrame:&drawRect];
        if (!NXContainsRect(&drawRect, r))
        {
            dropRect = drawRect;
            NXOffsetRect(&dropRect, rint(OFFSET * scale), rint(-OFFSET * scale));

            PSgsave();
            PSsetgray(NX_BLACK);
            PSsetlinewidth(LINEWIDTH * scale);
            PSrectclip(r->origin.x, r->origin.y, r->size.width, r->size.height);
            PSrectfill(dropRect.origin.x, dropRect.origin.y,
                dropRect.size.width, dropRect.size.height);
            PSrectstroke(drawRect.origin.x, drawRect.origin.y,
                drawRect.size.width, drawRect.size.height);
            PSgrestore();
        }
    }

    return self;
}

@end