Chapter 2. General object methods- the class hk_visible
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## Chapter 2. General object methods- the class hk_visible

Each visible object of hk_classes is inherited from a class called hk_visible, so we will now have a look on the general available methods

Figure 2.1. Geometry specific methods

> set_size(x, y,width,height)

>   lets you to set position and size of an object

> set_size(width,height)

>   lets you to set size of an object

> set_position(x,y)

>   lets you to set position of an object

> set_x(x)

>   lets you to set the horizontal position of an object

> set_y(y)

>   lets you to set the vertical position of an object

> set_width(width)

> set_height(height)

> x()

>   returns the x co-ordinate of the object

> y()

>   returns the y co-ordinate of the object

> width()

>   returns the width of the object

> height()

>   returns the height of the object

Figure 2.2. Look and Feel methods

> set_font(fontname,size)

>   sets the font, e.g. set_font("Arial",12)

> set_font(font)

> hk_font font()

>   returns a font object

> set_foregroundcolour(colour)

> foregroundcolour()

> set_backgroundcolour(colour)

> hk_colour backgroundcolour()

Figure 2.3. Miscelleanous methods

> set_label(labeltext)

> label()

> enum enum_visibletype {textlabel,button,rowselector,boolean,lineedit,memo,combobox,grid,form,report,reportsection,reportdata,other}

> enum_visibletype type(void)

> identifier()

> hk_presentation* presentation()

>   returns the parent presentation object (either a form or a report)

The following example shows how to move the button within the form, how to change the colour and how to display different text on the button.

Example 2.1. Changing colour and position

    redcolour =hk_colour(255,0,0)
    greencolour =hk_colour(0,255,0)
    if hk_this.foregroundcolour().red()!=255:
    	hk_this.set_foregroundcolour(redcolour)
    	hk_this.set_backgroundcolour(greencolour)
    	hk_this.set_label("green button")
    else:
    	hk_this.set_foregroundcolour(greencolour)
    	hk_this.set_backgroundcolour(redcolour)
    	hk_this.set_label("red button")

    hk_this.set_position(hk_this.x()+50,hk_this.y()+10)

Figure 2.4. Predefined colour names

> - hk_aqua

> - hk_beige

> - hk_black

> - hk_blue

> - hk_brown

> - hk_fuchsia

> - hk_darkgrey

> - hk_green

> - hk_grey

> - hk_lightgrey

> - hk_lime

> - hk_maroon

> - hk_navy

> - hk_olive

> - hk_orange

> - hk_pink

> - hk_purple

> - hk_red

> - hk_silver

> - hk_teal

> - hk_white

> - hk_yellow

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