Customizing Forms
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Gum Forms controls provide standardized functionality which can be fully customized. Forms controls place very few restrictions on their appearance and behavior. Even though a typical Button has a Text and NineSlice, it could be made of anything (really).
This tutorial shows how to customize Forms controls
This tutorial continues from previous tutorials, but initially it deletes all instances from the TitleScreen except a single ButtonStandard instance.
This tutorial modifies the default Gum Forms components. You may want to make a copy of your current project or use version control such as Git to undo your changes in case in case you want to start over.
The simplest form of customization is to modify the instance directly in Gum. Since the ButtonStandardInstance is a regular Gum object, any of its properties can be modified as expected. For example we can modify its X, Y, Width, Height, and Button Display Text properties in Gum and these changes show up in game.
While we technically have modified variables on the ButtonStandardInstance, this is usually not what we mean by customizing.
We can make modifications to ButtonStandard directly in Gum. We can select the ButtonStandard in Gum to see its individual components.
Notice that by default the Default state is selected.
If we make modifications to the ButtonStandard, every instance reflects these changes. For example, we can select TextInstance and set the following values:
Font = Impact
Font Size = 18
Is Bold = false (unchecked)
Now our instance in TitleScreen also reflects these changes, both in Gum and also in our game
If we try to change the background color on our Button, it doesn't apply in our game. For example, we can change the Background's color value in Gum. the ButtonStandard background changes in Gum:
However, if we run the game, the color reverts back to the default teal color. This happens because the button has multiple colors, not just one. Which color is displayed depends on whether the button is enabled, disabled, hovered, or pressed. We can see some of these states by running the game, moving the mouse over the button, and clicking on it.
These colors are all controlled by the ButtonStandard's states inside of its ButtonCategory. We can expand the category and click on each of the states to preview them in the Editor tab.
Since one of the states is always active, the maroon color we set in the default state is overridden immediately by the Enabled state when the app runs.
Note that only the color value was overridden by the ButtonCategory states - the changes we made to Font and Font Size showed up in game. We can see which variables are modified by the ButtonCategory states by selecting ButtonCategory.
Any change we make to the ButtonStandard component can be either done in the Default state if it is not associated with a particular state, or it can be made in the specific ButtonCategory state.
We can modify the variables that are already set in the states, or we can remove the variables completely. For simplicity we will clear the states and start from scratch. To do this, select the ButtonCategory, then press the X button next to each variable to clear it from all states in that category.
Now we can select each of the states and modify the background color as desired. Feel free to experiment as you create states. Keep in mind you can modify anything on the ButtonStandard including TextInstance and Background. If you want to revert variable changes, select the ButtonCategory and press the X button to remove the variable assignments on all states.
As before, Gum lets us preview the states by selecting them.
Once these states have been changed, we can run the game and see the states in game.
For more information on states and categories, see the States and State Categories tutorials.
All Forms components can be customized in Gum. As with the ButtonStandard component, the first thing to check is whether a component has states. For example, to modify TextBox, first check which variables are modified in TextBoxCategory.
After determining which variables are controlled by the TextBoxCategory, make the changes to the TextBox either in the default state (if the variable is not set in TextBoxCategory), or select the desired state in TextBoxCategory (if the variable is in TextBoxCategory).
