Modal Window
The Modal Window is a Container type widget that displays a window and blocks touch events to the underlying view and widgets. The Modal Window consists of a background Image and a Box that acts as a shade over the underlying view and widgets with adjustable alpha. The Modal Window will fill up the entire screen and should always be added as the last element such that it is always on top of all other elements.
Modal Window running in the simulator
Widget Group
The Modal Window can be found in the Containers widget group in TouchGFX Designer.
Modal Window in TouchGFX Designer
Properties
The properties for a Modal Window in TouchGFX Designer.
| Property Group | Property Descriptions |
|---|---|
| Name | Name of the widget. Name is the unique identifier used in TouchGFX Designer and code. |
| Modal Image Location | X and Y specify the top left corner of the image within the Modal Window. W and H specify the width and height of the container within the Modal Window. The size of the container within the Modal Window is taken from the size of the associated image and cannot be altered except by changing the image. Lock specifies if the widget should be locked in its current X, Y, W and H. Locking the widget also disables interacting with the widget through the screen. Visible specifies the visibility of the widget. Making the widget invisible also disables interacting with the widget through the screen. |
| Appearance | Window Image specifies which image the Modal Window should use. Shade Color specifies the color of the overlay shade. Shade Alpha specifies the transparency of the overlay shade. The alpha value ranges between 0 and 255 for the widget. 0 is fully transparent and 255 is solid. |
Interactions
The actions and triggers supported by the Modal Window are described in the following sections.
Actions
| Standard widget action | Description |
|---|---|
| Hide widget | Hides a widget (sets visibility to false). |
| Show widget | Make a hidden widget visible (sets visibility to true). |
Triggers
The Modal Window does not emit any triggers.
Performance
A Modal Window is a Container type that consists of a Box, a Container and an Image. The Modal Window does not per default appear in the draw chain. Therefore, the performance is mostly dependent on the childrens drawing performance.
For more general details on drawing performance, read the General UI Component Performance section.
Examples
Generated Code
In the generated code for the View base class we can see how TouchGFX Designer sets up a Modal Window.
mainViewBase.cpp
#include <gui_generated/main_screen/mainViewBase.hpp>
#include "BitmapDatabase.hpp"
#include <texts/TextKeysAndLanguages.hpp>
#include <touchgfx/Color.hpp>
mainViewBase::mainViewBase() :
buttonCallback(this, &mainViewBase::buttonCallbackHandler)
{
modalWindow.setBackground(touchgfx::BitmapId(BITMAP_BLUE_BACKGROUNDS_MAIN_BG_320X240PX_ID), 80, 16);
modalWindow.setShadeColor(touchgfx::Color::getColorFrom24BitRGB(0, 0, 0));
modalWindow.setShadeAlpha(150);
modalWindow.hide();
add(modalWindow);
}
void mainViewBase::setupScreen()
{
}
Tip
modalWindow.invalidate() if you change the appearance of the widget.TouchGFX Designer Examples
To further explore the Modal Window, try creating a new application within TouchGFX Designer with one of the following UI templates:
Modal Window Example UI template in TouchGFX Designer