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Code Issues Activity Actions

MacPDF: Change current page with arrow left/right

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This commit is contained in:
Nico Weber 2023-07-23 10:13:09 -04:00 • committed by Andreas Kling
parent c4c4ead9d2
commit ef91ced481
1 changed files with 40 additions and 6 deletions
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46
Meta/Lagom/Contrib/MacPDF/LagomPDFView.mm
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@ -20,13 +20,12 @@
RefPtr<Core::MappedFile> _file;
RefPtr<PDF::Document> _doc;
NSBitmapImageRep* _rep;
int _page_index;
}
@end
static PDF::PDFErrorOr<NonnullRefPtr<Gfx::Bitmap>> render(PDF::Document& document, NSSize size)
static PDF::PDFErrorOr<NonnullRefPtr<Gfx::Bitmap>> render(PDF::Document& document, int page_index, NSSize size)
{
NSLog(@"num pages %@", @(document.get_page_count()));
int page_index = 0;
auto page = TRY(document.get_page(page_index));
Gfx::IntSize page_size;
@ -79,16 +78,24 @@ static NSBitmapImageRep* ns_from_gfx(NonnullRefPtr<Gfx::Bitmap> bitmap_p)
return document;
}
- (void)pageChanged
{
if (!_doc || _doc->get_page_count() == 0)
return;
NSSize pixel_size = [self convertSizeToBacking:self.bounds.size];
if (auto bitmap_or = render(*_doc, _page_index, pixel_size); !bitmap_or.is_error())
_rep = ns_from_gfx(bitmap_or.value());
}
- (void)drawRect:(NSRect)rect
{
static bool did_load = false;
if (!did_load) {
NSSize pixel_size = [self convertSizeToBacking:self.bounds.size];
_page_index = 0;
did_load = true;
if (auto doc_or = [self load]; !doc_or.is_error()) {
_doc = doc_or.value();
if (auto bitmap_or = render(*_doc, pixel_size); !bitmap_or.is_error())
_rep = ns_from_gfx(bitmap_or.value());
[self pageChanged];
} else {
NSLog(@"failed to load: %@", @(doc_or.error().message().characters()));
}
@ -96,4 +103,31 @@ static NSBitmapImageRep* ns_from_gfx(NonnullRefPtr<Gfx::Bitmap> bitmap_p)
[_rep drawInRect:self.bounds];
}
- (BOOL)acceptsFirstResponder
{
return YES;
}
- (void)keyDown:(NSEvent*)event
{
[self interpretKeyEvents:@[ event ]];
}
- (IBAction)moveLeft:(id)sender
{
if (_page_index > 0) {
_page_index--;
[self pageChanged];
[self setNeedsDisplay:YES];
}
}
- (IBAction)moveRight:(id)sender
{
if (_page_index < _doc->get_page_count() - 1) {
_page_index++;
[self pageChanged];
[self setNeedsDisplay:YES];
}
}
@end