diff options
Diffstat (limited to 'macosx/tkMacOSXDraw.c')
-rw-r--r-- | macosx/tkMacOSXDraw.c | 113 |
1 files changed, 81 insertions, 32 deletions
diff --git a/macosx/tkMacOSXDraw.c b/macosx/tkMacOSXDraw.c index 1aba8f4..5512669 100644 --- a/macosx/tkMacOSXDraw.c +++ b/macosx/tkMacOSXDraw.c @@ -8,6 +8,7 @@ * Copyright (c) 1995-1997 Sun Microsystems, Inc. * Copyright 2001-2009, Apple Inc. * Copyright (c) 2006-2009 Daniel A. Steffen <das@users.sourceforge.net> + * Copyright 2014 Marc Culler. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. @@ -217,8 +218,6 @@ XCopyArea( display->request++; - TkMacOSXDbgMsg("XCopyArea"); - if (!width || !height) { /* This happens all the time. TkMacOSXDbgMsg("Drawing of empty area requested"); @@ -239,7 +238,7 @@ XCopyArea( img = [bitmap_rep CGImage]; } } else { - TkMacOSXDbgMsg("Invalid source drawable"); + TkMacOSXDbgMsg("Invalid source drawable - neither window nor pixmap."); } if (img) { @@ -249,11 +248,11 @@ XCopyArea( CGRectMake(dest_x, dest_y, width, height)); CFRelease(img); } else { - TkMacOSXDbgMsg("Invalid source drawable"); + TkMacOSXDbgMsg("Failed to construct CGImage."); } } else { - TkMacOSXDbgMsg("Invalid destination drawable"); + TkMacOSXDbgMsg("Invalid destination drawable - no context."); return; } @@ -1478,43 +1477,93 @@ TkScrollWindow( int dx, int dy, /* Distance rectangle should be moved. */ TkRegion damageRgn) /* Region to accumulate damage in. */ { - MacDrawable *macDraw = (MacDrawable *) Tk_WindowId(tkwin); + Drawable drawable = Tk_WindowId(tkwin); + MacDrawable *macDraw = (MacDrawable *) drawable; NSView *view = TkMacOSXDrawableView(macDraw); - CGRect visRect, srcRect, dstRect; - CGFloat boundsH; - HIShapeRef dmgRgn, dstRgn; + CGRect visRect, srcRect, dstRect, scroll_src, scroll_dst; + HIShapeRef dmgRgn = NULL; + NSRect bounds; int result; - if (view && !CGRectIsEmpty(visRect = NSRectToCGRect([view visibleRect]))) { - boundsH = [view bounds].size.height; - srcRect = CGRectMake(macDraw->xOff + x, boundsH - height - - (macDraw->yOff + y), width, height); - dstRect = CGRectIntersection(CGRectOffset(srcRect, dx, -dy), visRect); - srcRect = CGRectIntersection(srcRect, visRect); - if (!CGRectIsEmpty(srcRect) && !CGRectIsEmpty(dstRect)) { + if ( view ) { + /* Get the scroll area in NSView coordinates (origin at bottom left). */ + bounds = [view bounds]; + scroll_src = CGRectMake( + macDraw->xOff + x, + bounds.size.height - height - (macDraw->yOff + y), + width, height); + scroll_dst = CGRectOffset(scroll_src, dx, -dy); + /* Limit scrolling to the window content area. */ + visRect = NSRectToCGRect([view visibleRect]); + scroll_src = CGRectIntersection(scroll_src, visRect); + scroll_dst = CGRectIntersection(scroll_dst, visRect); + + if ( !CGRectIsEmpty(scroll_src) && !CGRectIsEmpty(scroll_dst) ) { + + /* + * Mark the difference between source and destination as damaged. + * This region is described in the Tk coordinate system, after shifting by dy. + */ + + srcRect = CGRectMake(x - macDraw->xOff, y - macDraw->yOff, + width, height); + dstRect = CGRectOffset(srcRect, dx, dy); + dmgRgn = HIShapeCreateMutableWithRect(&srcRect); + HIShapeRef dstRgn = HIShapeCreateWithRect(&dstRect); + ChkErr(HIShapeDifference, dmgRgn, dstRgn, (HIMutableShapeRef) dmgRgn); + CFRelease(dstRgn); + + /* Scroll the rectangle. */ + [view scrollRect:NSRectFromCGRect(scroll_src) by:NSMakeSize(dx, -dy)]; + [view displayRect:NSRectFromCGRect(scroll_dst)]; + + /* + * When a Text widget contains embedded images, scrolling generates + * lots of artifacts involving multiple copies of the images + * displayed on top of each other. Extensive experimentation, with + * very little help from the Apple documentation, indicates that + * whenever an image is displayed it gets added as a subview, which + * then gets automatically redisplayed in its original location. + * + * We do two things to combat this. First, each subview that meets + * the scroll area is added as a damage rectangle. Second, we + * redisplay the subviews after the scroll. + */ + /* - CGRect sRect = CGRectIntersection(CGRectOffset(dstRect, -dx, dy), - srcRect); - NSCopyBits(0, NSRectFromCGRect(sRect), - NSPointFromCGPoint(CGRectOffset(sRect, dx, -dy).origin)); - */ - [view scrollRect:NSRectFromCGRect(srcRect) by:NSMakeSize(dx, -dy)]; + * Step 1: Find any subviews that meet the scroll area and mark + * them as damaged. Use Tk coordinates, shifted to account for the + * future scrolling. + */ + + for (NSView *subview in [view subviews] ) { + NSRect frame = [subview frame]; + CGRect subviewRect = CGRectMake( + frame.origin.x - macDraw->xOff + dx, + (bounds.size.height - frame.origin.y - frame.size.height) - macDraw->yOff + dy, + frame.size.width, frame.size.height); + /* Rectangles with negative coordinates seem to cause trouble. */ + if (subviewRect.origin.y < 0 && subviewRect.origin.y + subviewRect.size.height > 0) { + subviewRect.origin.y = 0; + } + CGRect intersection = CGRectIntersection(srcRect, subviewRect); + if (! CGRectIsEmpty(intersection) ){ + dstRgn = HIShapeCreateWithRect(&subviewRect); + ChkErr(HIShapeUnion, dmgRgn, dstRgn, (HIMutableShapeRef) dmgRgn); + CFRelease(dstRgn); + } + } + } - srcRect.origin.y = boundsH - srcRect.size.height - srcRect.origin.y; - dstRect.origin.y = boundsH - dstRect.size.height - dstRect.origin.y; - srcRect = CGRectUnion(srcRect, dstRect); - dmgRgn = HIShapeCreateMutableWithRect(&srcRect); - dstRgn = HIShapeCreateWithRect(&dstRect); - ChkErr(HIShapeDifference, dmgRgn, dstRgn, (HIMutableShapeRef) dmgRgn); - CFRelease(dstRgn); - TkMacOSXInvalidateViewRegion(view, dmgRgn); - } else { + } + + if ( dmgRgn == NULL ) { dmgRgn = HIShapeCreateEmpty(); } + //TkMacOSXInvalidateViewRegion(view, dmgRgn); TkMacOSXSetWithNativeRegion(damageRgn, dmgRgn); result = HIShapeIsEmpty(dmgRgn) ? 0 : 1; CFRelease(dmgRgn); - return result; } |