Injecting input in UWP apps

One of the less known capabilities of UWP apps is the ability to inject input. This is especially useful if you want to give the user a guided tour through the app, offer immediate feedback to users with assistive technologies or implement a remote help functionality into your app. In this article we will explore what the Windows.UI.Input.Preview.Injection namespace has to offer and how can you use it in your app. Continue reading “Injecting input in UWP apps”

Connect(); 2017

Another year has come and with it the fourth annual on-line Microsoft Connect conference. Between 15th and 17th November you could watch the newest goodness from Microsoft for all developers on all platforms.

Two main keynotes were dedicated to intelligent cloud and building intelligent applications of the future. Let’s see what Scott Guthrie (of course in his favourite red polo shirt) and other speakers have unveiled. Continue reading “Connect(); 2017”

Quick tip: Always implement all VisualStates!

I have come across an interesting oddity while building a UWP app.

XAML VisualStates define the visual look of control in different states. Even though you sometimes don’t need to make distinction for all of them, you should still implement them however (even if they are just a simple copy-paste of another style) or you might meet some inexplicable problems.

In my case I have customized the ListViewItem  style and forgot to include implementations for the PointerOverSelected  and PressedSelected  states. Surprisingly everything worked as expected on my devices, as the visual used the Selected  state as fallback. However, I have later found out the same did not happen on other devices and the list view items stayed in the PointerOver state until the mouse cursor moved away (which also makes sense).

This difference in behavior is especially interesting, as the problem did not originally occur on the stable builds of Windows 10 Creators Update, but now it seems to occur as well (maybe after some patches?).

Resource behavior inconsistency for ItemTemplates of list controls in Anniversary Update

It appears that the Anniversary Update has a hidden buggy behavior concerning Resources in ItemTemplates of list controls. I have hit this problem while working on an UWP app and I will describe the problem along with a workaround, which you can use to make sure your app will behave correctly on all versions of Windows 10. Continue reading “Resource behavior inconsistency for ItemTemplates of list controls in Anniversary Update”

When a single transparent color is simply not enough

There are countless times in the life of a Universal Windows Platform app developer when the “Transparent” color comes handy. However, it is good to remember that “Transparent” is still just a color, otherwise you can encounter some unwelcome surprises.

Animation of "Transparent" color
On the left is the animation from “Transparent” to White, on the right from “Transparent” to Black

Continue reading “When a single transparent color is simply not enough”