Version 8.3.4
 —  Special Development Topics  —

ROWABSAREA

It is possible to define flexible areas in which absolutely positioned controls are displayed. There are three possibilities:

The following topics provide more details on how to use each possibility.


All Controls Directly Inside the Page Tag

This is the easiest way to use absolutely positioned controls - and it is used in the example previously in this part. Each coordinate of a control relates to the whole generated HTML page, i.e. the coordinate "(0;0)" positions a control at the left-top corner of the page.

Though this is the fastest way to start with, there are some disadvantages:

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All Controls Inside the Page Body

The page body (PAGEBODY tag) typically reflects the area between header and status bar. It is possible to add a ROWABSAREA control inside the page body. Inside the ROWABSAREA container, you can position your controls.

If you do not define any further parameters by this ROWABSAREA control, it will occupy the whole page body if necessary. Defining the vscroll and hscroll properties (set to true) inside the PAGEBODY tag, you can scroll to any control that is outside the visible range of the page body.

Look at the following example: it contains two absolutely positioned icons inside the page body. If the window size is too small to show both icons, the scroll bars are shown accordingly.

Absolute positioning

Absolute positioning

The layout definition of this example looks as follows:

<pagebody vscroll="true" hscroll="true">
    <rowabsarea>
        <absfolder>
            <absicon image="images/logo.gif" x="150" y="100" z="10">
            </absicon>
            <absicon image="images/logo.gif" x="250" y="200" z="10">
            </absicon>
        </absfolder>
    </rowabsarea>
</pagebody>

The controls are positioned relative to the page body's coordinates. I.e. the coordinate "(0;0)" is the left-top corner of the page body.

Use this method to position the controls within a page where the page body is used for positioned controls absolutely.

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Explicit Areas for Absolute Positioning

Use the ROWABSAREA container, which is explained above, to define areas inside a page where you want to position controls.

Have a look at the following example:

Absolute positioning

An area was embedded for absolute positioning inside the normal flow of controls of a page. The corresponding XML layout definition looks as follows:

<rowarea name="Titel">
    <rowabsarea width="100%" height="350">
        <absfolder>
            <absicon image="images/logo.gif" x="50" y="50" z="100">
            </absicon>
            <absicon image="images/new.gif" x="120" y="120" z="100">
            </absicon>
            <absicon image="images/logo.gif" x="150" y="150" z="100">
            </absicon>
        </absfolder>
    </rowabsarea>
    <vdist height="5">
    </vdist>
    <itr>
        <label name="Parameter" width="120" asplaintext="false">
        </label>
        <field valueprop="factor1" length="20">
        </field>
    </itr>
</rowarea>

Inside the ROWAREA definition, a ROWABSAREA is placed - holding a defined width and size. Below the ROWABSAREA, the normal definition of a set of absolutely positioned controls are defined, i.e. an ABSFOLDER with some ABSICON definitions.

In the row following the ROWABSAREA, normal controls are defined - just as usual.

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Properties

Basic
width

Width of the control.

There are three possibilities to define the width:

(A) You do not define a width at all. In this case the width of the control will either be a default width or - in case of container controls - it will follow the width that is occupied by its content.

(B) Pixel sizing: just input a number value (e.g. "100").

(C) Percentage sizing: input a percantage value (e.g. "50%"). Pay attention: percentage sizing will only bring up correct results if the parent element of the control properly defines a width this control can reference. If you specify this control to have a width of 50% then the parent element (e.g. an ITR-row) may itself define a width of "100%". If the parent element does not specify a width then the rendering result may not represent what you expect.

Optional

100

120

140

160

180

200

50%

100%

height

Height of the control.

There are three possibilities to define the height:

(A) You do not define a height at all. As consequence the control will be rendered with its default height. If the control is a container control (containing) other controls then the height of the control will follow the height of its content.

(B) Pixel sizing: just input a number value (e.g. "20").

(C) Percentage sizing: input a percantage value (e.g. "50%"). Pay attention: percentage sizing will only bring up correct results if the parent element of the control properly defines a height this control can reference. If you specify this control to have a height of 50% then the parent element (e.g. an ITR-row) may itself define a height of "100%". If the parent element does not specify a width then the rendering result may not represent what you expect.

Optional

100

150

200

250

300

250

400

50%

100%

comment

Comment without any effect on rendering and behaviour. The comment is shown in the layout editor's tree view.

Optional  

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