CSS

Under Construction

See Also

QT Style Sheets Reference

QT Style Sheets Syntax

W3Schools CSS

Introduction

Lianja Apps can be styled using CSS to your preferred theme or themes.

Defining

Use the CSS Style Attribute in the App Inspector Attributes tab or Attributes Dialog to specify the CSS properties.

CSS Style can be set to the name of a CSS file.

Use the 'app:/' prefix for a CSS file in the App:

CSS Style: app:/myapp.css

and the 'lib:/' prefix for a CSS file in the library.

CSS Style: lib:/myapp.css

The CSS file can contain CSS property definitions for a single UI element, multiple elements or for the whole App or multiple Apps. In the App Settings, the App CSS Style file will be created in the library by default, allowing the same CSS file to be used by multiple Apps.

Alternatively, CSS Style can be set to a character string. Each property definition is terminated with a semi-colon (;), for example:

CSS Style: border: 2px solid green; font: bold italic large "Times New Roman";

To access CSS Style in code using setAttribute() and getAttribute() the attribute name is cssStyle.

Lianja.get("page1.section1.field1").setAttribute('cssStyle','border: 2px solid green; font: bold italic large "Times New Roman";')

? Lianja.get("page1.section1.field1").getAttribute('cssStyle')

As well as the primary CSS Style attribute the following sub-component styles can also be defined (the setAttribute() / getAttribute() attribute names are shown in brackets where available):

App:

• Page defaults:
  • Navigation bar CSS
  • Page menu CSS
• Section defaults:
  • Header CSS
  • Section CSS

Page:

• Navigation Panel: CSS Style (leftSidebarTreeStylesheet)

Section:

• Header: Header CSS Style (headerCssStyle)
• Subtitle: CSS Style (subtitleCssStyle)
• Footer: Footer button CSS (footerButtonCss)

Checklistview Gadget:

• Data: CSS Style (gadgetCssStyle)

Grid Gadget:

• Data: CSS Style (gadgetCssStyle)

Treeview Gadget:

• Data: CSS Style (gadgetCssStyle)

Listview Gadget:

• Data: CSS Style (gadgetCssStyle)

Custom Sections and Gadgets

In Custom Sections and Custom Gadgets using the Lianja UI Framework, the equivalent property is stylesheet (css is also supported).

Selectors

In CSS files, selectors define the individual object or type of object to be styled.

Universal Selector

The asterisk (*) selects all objects.

It can be used on its own:

* {
	font:italic bold 12px/30px Georgia, serif;
}

or following an ID or Type selector to specify that properties should be cascaded to all objects lower in the hierarchy:

lianja_ui_page * {
	font: italic bold 12px/30px Georgia, serif;	
	background:black;
	color:white;
}

or preceding a Property selector to specify that it should apply to all objects with that property value:

* [user_attr1="16"] {
	border: 20px solid red; 
}

Note that this is the default behavior, so the * is not required.

ID Selectors

The ID selector #id selects by object name. For example:

#page1_section1_field1

In an App, each UI element is given a unique object id.

Page: pageid (Page 'name' attribute).

Section: pageid + "_" + sectionid (Section 'name' attribute).

Formitem: pageid + "_" + sectionid + "_" + formitemid (Form Section Field/Gadget or Canvas Section Advanced Control 'name' attribute).

#page1 * {
	background:black;
	color:green;
}
#page1_section1 * {
	background:blue;
	color:red;
}
#page1_section1_field1 * {
	background:red;
	color:yellow;
}

Custom Sections and Gadgets

In Custom Sections and Custom Gadgets using the Lianja UI Framework, the elements use the name property that you assign to them.

#nShipperID {
	background:blue;
	color:yellow;
}

Type Selectors

Type selectors select by object type.

Pages, Sections and Formitems

The following selectors can be used for Lianja Pages, Sections and Formitems:

Page:

Selector	UI Element
lianja_ui_page	Lianja Page
[lianja_ui_page_footer]	Lianja Page footer
[lianja_ui_page_header]	Lianja Page header
[lianja_ui_page_panel]	Lianja Page main panel
[lianja_ui_page_sidebar]	Lianja Page left and right sidebars

Section:

Selector	UI Element
lianja_ui_section	Lianja Section
[lianja_ui_section_footer]	Lianja Section footer

Formitem:

Selector	UI Element
lianja_ui_section_formitem	Lianja Formitem (Fields, Gadgets, Advanced Controls)
[lianja_ui_section_formitem_data]	Lianja Formitem data
[lianja_ui_section_formitem_label]	Lianja Formitem label (caption)
[lianja_ui_section_formitem_separator]	Lianja 'Horizontal Separator' Formitem

UI Framework

The following selectors can be used for Lianja UI Framework classes in Custom Sections and Custom Gadgets:

Class	Selector
Checkbox	lianja_ui_checkbox
Combobox	lianja_ui_combobox
Commandbutton	lianja_ui_commandbutton
Container	lianja_ui_container
Control	lianja_ui_control
Datetextbox	lianja_ui_datetextbox
Datetimetextbox	lianja_ui_datetimetextbox
Editbox	lianja_ui_editbox
Editor	lianja_ui_editor
Form	lianja_ui_form
Grid	lianja_ui_grid
Grid sub-control	lianja_ui_grid::item
Header	lianja_ui_header
Label	lianja_ui_label
Listbox	lianja_ui_listbox
Menu	lianja_ui_menu
MenuBar	lianja_ui_menubar
MenuItem	lianja_ui_menuitem
Optionbutton	lianja_ui_optionbutton
Pageframe	lianja_ui_pageframe
Popupmenu	lianja_ui_popupmenu
Progressbar	lianja_ui_progressbar
Richeditbox	lianja_ui_richeditbox
Spinner	lianja_ui_spinner
Splitter	lianja_ui_splitter
Page	lianja_ui_tabpage
Textbox	lianja_ui_textbox
Toolbar	lianja_ui_toolbar
Toolbox	lianja_ui_toolbox
Tree	lianja_ui_tree
Tree sub-control	lianja_ui_tree::item

Property Selectors

Selectors may be based on the value of a 'custom attribute' or user-added property.

For example, a Form Section Field has a custom attribute defined:

Custom attributes: attr1=16

The 'Custom attributes' can be found at the bottom of the Data section in the Attributes dialog or App Inspector Attributes tab.

The CSS file has the following entry which will be applied to the Field:

[user_attr1="16"] {
	color:blue; 
}

Note that the custom attribute is 'attr1' and that it is referred to in the CSS selector as 'user_attr1'. Also, that the value should be in quotes - here "16".

Custom attributes should also have the 'user_' prefix specified when accessed using Lianja.get(), i.e.

Lianja.get("page1.section1.field1").user_attr1

The same Property Selector above will also be applied to a Checkbox Gadget where the property and its value have been set using the addProperty() method.

oCheck = Lianja.get("page1.section1.field10")
oCheck.addproperty("user_attr1","16")

Note that here the property is 'user_attr1', matching the name in the CSS selector.

UI State Selectors

UI State Selectors are special built-in Property Selectors for Canvas Section editable Advanced Controls.

Select based on whether the 'Mandatory' attribute is true or false:

[lianja_uistate_mandatory="true"]

[lianja_uistate_mandatory="false"]

Select based on whether 'Validation' returned true or false:

[lianja_uistate_valid="true"]

[lianja_uistate_valid="false"]

Pseudo-State Selectors

Selectors may contain pseudo-states. They are prefixed with a colon (:).

hover

lianja_ui_grid::item:!hover { 
	background:pink;
}
lianja_ui_grid::item:hover { 
	background:yellow;
}