Composing your Gallery app

Alright, we completed AlbumListWidget, AlbumWidget, and PictureWidget. If you remember correctly, AlbumListWidget and AlbumWidget are contained in a widget called GalleryWidget.

Let's take a look at the GalleryWidget.ui file:

This widget does not contain any standard Qt widgets, only our created widgets. Qt provides two ways to use your own widgets in the Qt designer:

• Promoting widgets: This is the fastest and easiest way
• Creating widget plugin for Qt designer: This is more powerful but more complex

In this chapter, we will use the first way, which consists of placing a generic QWidget as a placeholder and then promoting it to our custom widget class. You can follow these steps to add the albumListWidget and albumWidget objects to the GalleryWidget.ui file from the Qt designer:

1. Drag and drop a Widget from Containers to your form
2. Set the objectName (for example, albumListWidget) from the Property Editor
3. Select Promote to... from the widget contextual menu
4. Set the promoted...