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>Chapter 1. The various actions</H1
><P
>Each object in a form has its own programmable actions. General actions are
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>On click: script that will be executed when a mouse click on this object occurs</P
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>On doubleclick: script that will be executed when a mouse doubleclick on this object occurs</P
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>On open: script that will be executed when the form is created or put into viewmode</P
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>On close: script that will be executed when the form is closed or put into designmode</P
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>
Let's write a 'hello world' program. Create a new form and add a button. Select the button and click on the 'On click'-actionbutton
in the property editor. Now add the following program into the program editor
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>Example 1-1. Hello world-program</B
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> 1 hk_this.show_warningmessage("Hello world")
2 </PRE
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Now close the window and change to viewmode. When you push the button you will see a dialog window with "Hello world".</P
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>The global variable <SPAN
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>hk_this</I
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> is set from hk_classes and represents the current object, in this case the button.
<SPAN
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><I
CLASS="EMPHASIS"
>show_warningmessage()</I
></SPAN
> is a method of this object, that allows you to display a string in a GUI independent way (as knoda is a KDE application
it will be displayed as a KDE window but if you start it within a command line program it will be displayed on the standard output).
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>Other GUI-independent ways for user interaction are
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>show_warningmessage(message); displays 'message'</P
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>bool show_yesnodialog(message, bool default_value); displays 'message' and returns true if you answer 'yes'. The
parameter 'default_value' is used for conevience to preselect 'yes' or 'no' in dialog boxes</P
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>hk_string show_stringvaluedialog(text); displays 'text' as a question and returns your response</P
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