BasicDialog (3U)

#include <Unidraw/dialogs.h>

BasicDialog is the base class for subclasses that implement simple but common dialog boxes. AcknowledgeDialog simply displays a one or two line message with a PushButton for dismissing the dialog. ConfirmDialog displays one or two lines of descriptive text with three pushbuttons marked ``Yes,'' ``No,'' and ``Cancel'', all of which dismiss the dialog. ConfirmDialog also provides an interface for retrieving the button pushed. GridDialog lets the user specify the resolution of a cartesian grid. PrintDialog is a FileChooser for specifying the name of a file or a printer. Finally, UChooser extends the StringChooser protocol to provide additional useful features, including support for alphabetizing its StringBrowser's contents and for embellishing the dialog with descriptive text.

void SetTitle(const char*)

void SetSubtitle(const char*)

BasicDialogs can display one or two lines of descriptive text. These functions change the text appearing in these lines. The change appears immediately if the dialog is visible.

BasicDialog(

ButtonState*, const char* title = ``'',

const char* subtitle = ``'', Alignment = Center

)

BasicDialog(

const char*, ButtonState*, const char* title = ``'',

const char* subtitle = ``'', Alignment = Center

)

Instantiate a BasicDialog, supplying an optional instance name, a button state, title and subtitle strings, and the dialog's alignment, which is used by its Popup operation. These operations will initialize two protected MarginFrame member variables, _title and _subtitle, which will contain either a Message instance with the specified string or a piece of glue if the string is null. These MarginFrames will be composed vertically at the top of the dialog, and no vertical space will be taken up by a null title or subtitle string.

virtual void Forward(Event&)

boolean IsAChild(Interactor*)

These functions are useful for rejecting spurious events while the dialog is visible, effectively locking out the rest of the application. If Forward's event argument has x and y coordinates that fall within the dialog's canvas, then Forward calls Handle on the event's target. Otherwise the BasicDialog's Handle is called. IsAChild returns true if the given interactor is a child of the dialog.

AcknowledgeDialog(const char* title, const char* subtitle)

Construct an AcknowledgeDialog instance with the given title and subtitle.

virtual void Acknowledge()

Call this function when the application should wait for the user to acknowledge the dialog. It returns when the user has pressed and released the dialog's push button. This function does not pop up the dialog.

ConfirmDialog(const char* title, const char* subtitle)

Construct a ConfirmDialog instance with the given title and subtitle.

virtual char Confirm()

Call this function when the application should wait for the user to confirm the dialog. It returns 'y', 'n', or '^G' ('\007'), depending whether the ``Yes,'' ``No,'' or ``Cancel'' push button was pressed, respectively. This function does not pop up the dialog.

GridDialog()

Construct a GridDialog instance. The GridDialog contains a MatchEditor instance for specifying the size of the grid's graduations in the x and y axes. The user can specify these values in pixels, points, centimeters, or inches by clicking on the appropriate radio button.

virtual void GetValues(float& xincr, float& yincr)

Return the user-specified values for the size of the grid's graduations, in pixel units.

void SelectMessage()

Highlight the values in the dialog's MatchEditor.

PrintDialog(boolean to_printer = true)

Construct a PrintDialog instance, optionally specifying whether the dialog should prompt for a printer name or a file name.

void ToPrinter(boolean)

boolean ToPrinter()

Specify and Return whether or not the string specified in the PrintDialog refers to a printer name.

UChooser(

const char* title, const char* subtitle,

const char* acceptLabel, const char* sample

)

Construct a UChooser instance. The title and subtitle parameters specify the descriptive text at the top of the dialog box. This constructor initializes two protected MarginFrame member variables _title and _subtitle that are analogous to the corresponding BasicDialog members described above.

void Clear()

Removes all strings from the UChooser's string browser.

void Include(const char*)

void Exclude(const char*)

Include inserts a string into the string browser at a position defined by the UChooser's Position function, described below. Exclude removes the given string from the string browser. If the string browser contains more than one copy of the string, then Exclude removes the one with the smallest index.

void SetTitle(const char*)

void SetSubtitle(const char*)

These functions change the text appearing in UChooser's title or subtitle. The change appears immediately if the dialog is visible.

UChooser(ButtonState*, int rows, int cols, Alignment)

Direct the UChooser to initialize itself with a string browser of the given size without initializing the MarginFrame members. Subclasses that require a different look-and-feel can use this constructor to avoid creating MarginFrames or Messages they don't need. The Init, Interior, and AddScroller functions (described below) factor out different parts of the default look and feel, allowing subclasses to use parts of it.

void Init(const char* title, const char* subtitle)

Explicitly initialize the MarginFrame members to display the given title and/or subtitle strings.

Interactor* Interior(const char* acceptLabel)

Return an interactor that composes the UChooser's default look and feel.

Interactor* AddScroller(Interactor*)

Return a composition containing the given interactor with a vertical scroll bar and adjusters along its right side, initializing them to scroll the interactor. The Interior function uses this operation to provide the string browser's scrolling interface.

virtual int Position(const char*)

Return an appropriate string browser index for the given string. By default, this function returns the index that will place the string in alphabetical order among those in the string browser.

Button(3I), Dialog(3I), Event(3I), FileChooser(3I), Frame(3I), MatchEditor(3I), Message(3I), StringBrowser(3I), StringChooser(3I), StringEditor(3I)