Designer scripts

Erel

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Staff member
Licensed User
Background

One of the most common issues that Android developers face is the need to adopt the user interface to devices with different screen sizes.
As described in the visual designer tutorial, you can create multiple layout variants to match different screens.
However it is not feasible nor recommended to create many layout variants.

Designer4android includes a tool named "designer scripts" that will help you fine tune your layout and easily adjust it to different screens and resolutions.

The idea is to combine the usefulness of the visual designer with the flexibility and power of programming code.

You can write a simple script to adjust the layout based on the dimensions of the current device and immediately see the results. No need to compile and install the full program each time.

You can also immediately see the results on the abstract designer. This allows you to test your layout on many different screen sizes.

How to

Every layout file can include script code. The script is written inside the visual designer under the Designer Scripts tab:



Their are two types of scripts: the general script that will be applied to all variants, and a script specific to the current variant.

Once you press on the Run Script button (or F5), the script is executed and the connected device / emulator and abstract designer will show the updated layout.

The same thing happens when you run your compiled program. The (now compiled) script is executed after the layout is loaded.

The general script is first executed followed by the variant specific script.

The script language is very simple and is optimized for managing the layout.

Lets start with an example.

Example

In this example we will build the following layout:


btnLeft and btnRight should be located in the top corners.
btnDown should be located at the bottom and fill the entire width.
ListView1 should fill the entire available area.
ToggleButton1 should be located exactly in the center.

The first step is to add the views and position them with the visual designer (you do not need to be 100% accurate).
Now we will select the designer scripts tab and add the code.
Note that the views are locked when the designer scripts tab is selected.

The code in this case is:
B4X:
'All variants script
btnRight.Right = 100%x 

btnDown.Bottom = 100%y
btnDown.Width = 100%x

EditText1.Width = 100%x
EditText1.Bottom = btnDown.Top - 5dip

ListView1.Width = 100%x
ListView1.SetTopAndBottom(btnLeft.Bottom, EditText1.Top)

ToggleButton1.HorizontalCenter = 50%x
ToggleButton1.VerticalCenter = 50%y
The result:



10'' tablet:




Reference

The following properties are supported:

- Left / Right / Top / Bottom / HorizontalCenter / VerticalCenter - Gets or sets the view's position. The view's width or height will not be changed.

- Width / Height - Gets or Sets the view's width or height.

- TextSize - Gets or sets the text size. You should not used 'dip' units with this value as it is already measured in physical units.

- Text - Gets or sets the view's text.
TextSize and Text properties are only available to views that show text.

- Image - Sets the image file (write-only). Only supported by ImageView.

- Visible - Gets or sets the view's visible property.

Methods:

- SetLeftAndRight (Left, Right) - Sets the view's left and right properties. This method changes the width of the view based on the two values.

- SetTopAndBottom (Top, Bottom) - Sets the view's top and bottom properties. This method changes the height of the view based on the two values.

Notes and tips

- %x and %y values are relative to the size of the main parent.


- Use 'dip' units for all specified sizes (except of TextSize). By using 'dip' units the values will be scaled correctly on devices with higher or lower resolution.

- In most cases it is not recommended to create variants with scales other than 1.0. When you add such a variant you will be given an option to add a normalized variant instead with a scale of 1.0.

- Variables - You can use variables in the script. You do not need to declare the variables before using them.
 

Erel

Administrator
Staff member
Licensed User
You are posting in the wrong place. Please start a new thread in Basic4android questions forum.
 
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