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Document: ggi

Purpose: Describes Ggi, the GIPSY graphical user interface

Category: USER-INTERFACE, SYSTEM

File: ggi.src

Author: J.P. Terlouw

Description: Ggi (``GIPSY graphical interface'') is a collection of
routines which allows the programmer to construct a graphical
user interface for a task. It is based on the X Toolkit
and the almost universally available Athena widgets.
It makes use of GIPSY's event-handling facilities.

The following routines are available:

1. routines which define some global setting:
--------------------------------------------
GgiAutoLayout
sets Ggi's layout policy, either automatic or explicit.
GgiPostponeRealize
causes Ggi to postpone realization of elements on the screen
until this is explicitly requested.
GgiRealize
realize created elements.
GgiSetHeight
set the application's main window height.
GgiSetWidth
set the application's main window width.
GgiConfigure
for automatic layout policy, set a number of dimensions.
GgiSetResources
set the application's fallback resources.
void GgiSetDisplay
override the default display name.

2. routines which create a user interface element:
--------------------------------------------------
a. simple elements
------------------
GgiTextField
create a text input field.
GgiEditor
create a text editor element.
GgiButton
create a push-down button.
GgiMenu
create a roll-down menu.
GgiList
create a list-selector element.
GgiGauge
create a bar-shaped analog valuator.
GgiDial
create a dial-shaped analog valuator.
GgiLabel
create a text output field.
GgiLogo
create the GIPSY logo.
GgiProgress
create a "progress bar".
GgiPlotField
create a PGPLOT-compatible plot area.
GgiCanvas
create an element without built-in behaviour.
GgiShell
create a secondary window containing other elements.
GgiDialog
like GgiShell, but interaction limited to this window.
GgiForm
create a container element for other elements.
GgiViewport
create a scrollable container element.

b. elements constructed from other elements
-------------------------------------------
GgiPrompter
prompter element implementing a simple dialog.
GgiPlotPrompter
prompter element for selecting a plot device.
GgiVerify
question pop-up window waiting for user action.
GgiPlotColorEditor
colormap editing element for plot fields.
GgiFileBrowser
directory browser and file selector.
GgiInset
set, subset and box input element.
GgiHelpMenu
configurable menu with associated help text pop-up.
GgiColorMenu
menu for selecting standard PGPLOT colors
GgiTextMenu
menu for selecting text items
GgiHeaderButton
button with associated GDS set header text pop-up.

3. routines which manipulate a user interface element:
------------------------------------------------------
GgiActivate
make the element sensitive to user interaction.
GgiDeactivate
make the element insensitive to user interaction.
GgiHelpText
set or modify the element's help text ('tip').
GgiSetLabel
set or modify the element's descriptive label.
GgiSetBitmap
set or modify a bitmap in the element's label.
GgiAlignLabel
modify the label's alignment (left, center, right).
GgiSetPosition
set or modify the element's position.
GgiSetRange
modify the range of an analog valuator element.
GgiSetFormat
modifies an analog valuator's output format.
GgiSetCircular
cause an analog valuator to wrap around outside its range.
GgiSetKeyword
modifies an element's associated user input keyword
GgiMenuLabels
modify the entry labels of a menu element.
GgiListLabels
modify the entry labels of a list element.
GgiDelete
delete the element.
GgiUseShell
specify secondary window in which to create elements.
GgiShowShell
make secondary window visible or invisible.
GgiPlotXor
set non-destructive plotting mode.
GgiPlotColors
obtain colors for the plotfields master table.
GgiPlotMapColors
map plotfield colors to colors from the master table.
GgiPlotFrames
create off-screen pixmaps associated with plot field.
GgiPlotRecord
record current plot in specified pixmap.
GgiPlotShow
copy specified pixmap to current plot window.
GgiPlotColorEditor
modify parameters in colormap editing element.
ScheduleGgiPlotCursor
register function receiving coordinates from a plot field.
DescheduleGgiPlotCursor
de-register coordinate function.

4. miscellaneous routines:
--------------------------
GgiWidth
return the element's width in pixels.
GgiHeight
return the element's height in pixels.
GgiShowDoc
pop up a document.
GgiDisplay
return the X11 display identification.
GgiWindow
return the element's X11 window identification.
GgiWidget
return the element's active widget.
GgiContext
return the Xt application context.
GgiIsRealized
test whether element is realized.
GgiHandleEvents
explicitly process outstanding events.
GgiKeyIdent
return a user input keyword's identification number.

All 'active' elements are associated with a user input keyword
through which user inputs are transferred to the
application. Once the user interface has been constructed,
the task normally only communicates with the user through
keywords. This communication is bi-directional: e.g. when
the user makes a change in a text input field,
this is notified to the application code,
but when the application changes the keyword value by
calling wkey_c(), the text input field is also updated.
This also works for analog valuators, buttons, etc.

It is possible to have more than one element associated
with a particular keyword, e.g. both a valuator and a text
field. In this case, when one element is manipulated, the
other element(s) will follow it.

Ggi must be initialized before scheduling any event handlers.
Creating any element implicitly initializes Ggi.

Updates: Jan 14, 1998: JPT, Document created.
Feb 24, 1998: JPT, GgiWidget and GgiContext added.
Feb 26, 1998: JPT, Plot field added.
Mar 4, 1998: JPT, GgiPlotXor added. Improved help pop-up.
Mar 9, 1998: JPT, GgiMenuLabels, GgiWidth and GgiHeight added.
Mar 16, 1998: JPT, Bug in plot initialization fixed.
Mar 23, 1998: JPT, Bug fixed in GgiMenuLabels, plotcursor improved.
Mar 25, 1998: JPT, GgiSetBitmap added.
Mar 31, 1998: JPT, Shell element added.
Apr 17, 1998: JPT, Use Slider2 widget for gauge.
May 13, 1998: JPT, Form element added.
Jun 8, 1998: JPT, Small improvements.
Jun 22, 1998: JPT, Small improvements.
Jun 24, 1998: JPT, GgiDialog added.
Jul 2, 1998: JPT, Improved XOR plot mode; special menu entries.
Aug 26, 1998: JPT, Small improvements.
Sep 11, 1998: JPT, Improved plot driver, added GgiHandleEvents.
Nov 9, 1998: JPT, Plot driver modified for PGPLOT 5.2.0.
Feb 8, 1999: JPT, Updated document for new features.
Feb 19, 1999: JPT, Textfields now always generate event on RETURN.
Mar 31, 1999: JPT, Recursive deletion. GgiPrompter added.
Apr 27, 1999: JPT, GgiSetKeyword added.
May 3, 1999: JPT, Fixed bug in SHELLdelete method
May 28, 1999: JPT, GgiPlotPrompter added.
Jun 23, 1999: JPT, Merge resource strings.
Jul 1, 1999: JPT, GgiProgress added.
Aug 4, 1999: JPT, GgiVerify added.
Sep 20, 1999: JPT, GgiPlotMapColors, GgiPlotColorEditor
and GgiIsRealized added.
Nov 2, 1999: JPT, GgiViewport, GgiList and GgiListLabels added.
Nov 25, 1999: JPT, GgiFileBrowser and GgiInset added.
Feb 17, 2000: JPT, GgiHelpMenu added.
Feb 18, 2000: JPT, Prevent window manager close.
Apr 18, 2000: JPT, Changed plotcursor and other small improvements.
Jun 23, 2000: JPT, Canvas now Simple widget instead of Label.
Jul 12, 2000: JPT, Documented GgiHelpMenu, GgiHeaderButton and
GgiKeyIdent.
Aug 21, 2000: JPT, Added GgiColorMenu and GgiTextMenu.
Sep 5, 2000: JPT, Added ggiGetMap to GgiPlotColorEditor.
Jan 10, 2001: JPT, Check for pseudocolor visual;
added GgiSetDisplay.
Feb 1, 2001: JPT, Support for non-default visuals.
Mar 12, 2001: JPT, Support for TrueColor visuals.
Mar 15, 2001: JPT, Improved keyboard mapping for plots.
Mar 22, 2001: JPT, Added arrow keys for plots.
Apr 24, 2001: JPT, Logging feature added.
May 9, 2001: JPT, General options pop-up.
Oct 9, 2001: JPT, Keyword interaction for GgiViewport.
Nov 12, 2001: JPT, Fixed visual bug in GgiMenuLabels.
Nov 23, 2001: JPT, Allow multiple X server screens