From a433c6c39bdaa5a53238596853617228be8ad07f Mon Sep 17 00:00:00 2001
From: xue <>
Date: Mon, 26 Dec 2005 03:18:00 +0000
Subject:
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.../protected/pages/chap2/KeyConcepts.page | 37 ++++++++++++++++++++++
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diff --git a/demos/quickstart/protected/pages/chap2/KeyConcepts.page b/demos/quickstart/protected/pages/chap2/KeyConcepts.page
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+
+A component is an instance of
+A property can be viewed as a public variable describing a specific aspect of the component, such as the background color, the font size, etc. A property is defined by the existence of a getter and/or a setter method of a component class. For example, in Key Concepts
+
+Components
+TComponent
or its child class. The base class TComponent
implements the mechanism of component properties and events.
+Component Properties
+TControl
, we have
+
+class TControl extends TComponent {
+ public function getID() {
+ ...
+ }
+ public function setID($value) {
+ ...
+ }
+}
+
+This defines a property named ID
. Reading the property (e.g. echo $component->ID;
) is equivalent to invoking the getter method (e.g. echo $component->getID();
); and writing the property (e.g. $component->ID='Button';
) is equivalent to invoking the setter method (e.g. $component->setID('Button');
).
+
+A property is read-only if it only has a getter method and no setter method. Since PHP method names are case-insensitive, property names are also case-insensitive. +
+ +
+A control is an instance of class TControl
or its subclass. A control is a component defined in addition with user interface. The base class TControl
defines the parent-child relationship among controls which reflects the containment relationship among user interface elements.
+