Cascades Development

[vladest]

is there is already implemented some kind of container, which shows Qimage and supporting scrolling and resizing?

If not, where to look at examples how to implement such kind of containers for Cascades?

May be I dont need a container but something else?

[martin78]

Have you looked at this knowledge base article? it may help point you in the correct direction

http://supportforums.blackberry.com/t5/Cascades-Development-Knowledge/Using-QImage-and-QPainter-to-P...

Martin

[vladest]

thanks, unfortunately, the page with sources on github doesnt exists anymore

[vladest]

I think to create CustomControl, where QImpage will be converted to Image

Do I moving to right direction?

[martin78]

Hmm that is odd, they did take it out..I'll have to look into it, the recommended way may have changed :/

[vladest]

thanks. waiting for new recommended way

[vladest]

I think its removed cause bb::cascades:ixelBufferData api doesnt exists anymore

so, the question still remains - how to show a pixel buffer in QML?

ImageData will not work because: "ImageData based images are different from other images in that they don't report state changes and they are not trackable through ImageTracker. They are also not available from QML."

[Dredvard]

Try this

//returns unmirroed image
static bb::cascades::Image fromQImage(const QImage &qImage) {
	bb::ImageData imageData(bb::PixelFormat::RGBA_Premultiplied, qImage.width(),
			qImage.height());

	unsigned char *dstLine = imageData.pixels();
	for (int y = 0; y < imageData.height(); y++) {
		unsigned char * dst = dstLine;
		for (int x = 0; x < imageData.width(); x++) {
			QRgb srcPixel = qImage.pixel(x, y);
			*dst++ = qRed(srcPixel);
			*dst++ = qGreen(srcPixel);
			*dst++ = qBlue(srcPixel);
			*dst++ = qAlpha(srcPixel);
		}
		dstLine += imageData.bytesPerLine();
	}

	return imageData;
}

 Now you'll have an Image intested of a QImage.

[vladest]

ok, but how to propagate the Image to ImageView ?

[Dredvard]

Bunch of ways you can do it.  I made an imageScaler class based on an ImageTracker and then onLoaded  then set imageviewID.image=imagescaler.image

In cpp you can use:

Q_SLOT voidsetImage (const Image &image)