Settings, Resizing window, Zoom recenter

[autistukral]

The last 3 things that I think would make this the "Best Photos App" that I have on mind are:
(That is if you have some free time to spare)

• Exporting / Importing settings for when you install qView on some other device

• I know this has been in the feature requests in the main qView for a few years, which is, when resizing the window clamp the aspect ratio of the window to that of the photo, so when you resize the window, there are no blank spots

• I have noticed that I think is only in this fork that zooming in and out the photo resizes it in some direction and then after like half a second it recenters itself, i think it should just stay centered without moving sideways unless you move the image

• Kind of a bonus: There could be an option for arrows on both horizontal ends of the window for next and previous images, but I can just use the arrows on keyboard anyway.

Thank you so much for all the work you put into this fork <3

[jdpurcell]

@autistukral The "bonus" feature has been partially possible for a while now with the "Side navigation regions" checkbox in Mouse settings. It is completely invisible (no arrow icons), but it reserves areas on the sides that navigate when clicked, as illustrated here:

Perhaps not ideal, but I didn't want to deal with the UI complexity of implementing visible arrows.

[jdpurcell]

• I know this has been in the feature requests in the main qView for a few years, which is, when resizing the window clamp the aspect ratio of the window to that of the photo, so when you resize the window, there are no blank spots

Probably not going to happen, I couldn't figure out how to make it work properly. Here's a little prototype in C# WinForms:

public partial class Form1 : Form {
	public Form1() {
		InitializeComponent();
		Resize += Form1_Resize;
	}

	private bool _isAdjusting;

	private void Form1_Resize(object sender, EventArgs e) {
		if (_isAdjusting)
			return;
		const double aspectRatio = 16.0 / 9.0;
		Size size = Size;
		int recomputedWidth = (int)Math.Round(size.Height * aspectRatio);
		int recomputedHeight = (int)Math.Round(size.Width / aspectRatio);
		if (recomputedWidth < size.Width)
			size.Width = recomputedWidth;
		else
			size.Height = recomputedHeight;
		_isAdjusting = true;
		Size = size;
		_isAdjusting = false;
	}
}

Aside from the annoying flickering, it only works when resizing diagonally from the bottom-right corner. If you try to resize from only the right edge or bottom edge, it only lets you go smaller, not bigger. I can't figure out what the correct algorithm is or if it's even possible with the limited information available during the resize event - it might depend on knowing other things like which specific edge or corner of the window is being dragged.

[jdpurcell]

• I have noticed that I think is only in this fork that zooming in and out the photo resizes it in some direction and then after like half a second it recenters itself, i think it should just stay centered without moving sideways unless you move the image

Yes it's only in this fork, that was an intentional change that makes zooming play nice with the "zoom towards cursor" setting. It ensures that the cursor always stays over the same position in the image even if it's zoomed smaller than the viewport.

follow.cursor.mov

I implemented an option to disable it in b973207 but there is no UI checkbox for it. If you'd like to try it, change the Registry via:
reg add HKEY_CURRENT_USER\SOFTWARE\qView\qView-JDP\options /v disabledelayedconstraint /f /t REG_SZ /d true

Or for macOS users:
defaults write com.qview.qView-JDP options.disabledelayedconstraint -bool TRUE