Author: Gu Zhu

Title — Dropdown title. You must first set the Title Widget.
Icon — Dropdown icon. You must first set the Icon Widget.
Title Color — Color of the title text.
Title Font Size — Font size of the title.
Items — Titles of each item in the dropdown.
Values — Values for each item, used in code logic.
Icons — Icons for each item.
Popup Direction — Direction the dropdown opens:
- Auto — Automatically determines direction based on dropdown position. For example, if the dropdown is near the bottom of the stage, it will open upwards to avoid clipping content.
- Up — Opens upward.
- Down — Opens downward.
Visible Item Count — Limits the number of visible items. Items exceeding this count are scrollable.
Selected Controller — See Controller and Dropdown Interaction.

These properties bind the dropdown’s functional sub-components. Note: if the dropdown node is part of a prefab instance, these properties are hidden.

Dropdown Res — Dropdown resource, which is a prefab. Typically designed as a background + list. The background should adapt to the container’s width and height. The list must be named "list" and usually requires vertical scrolling.
Title Widget — Sets the text sprite.
Icon Widget — Sets the icon sprite.

The dropdown usually contains a controller named "button", since its behavior is similar to a button. Design it like a button:

When the dropdown is clicked and expanded, the "button" controller stays on the "down" page.
When the dropdown collapses, the "button" controller returns to "up" or "over" page.

GComboBox Component

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