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/*
* tkScale.h --
*
* Declarations of types and functions used to implement the scale
* widget.
*
* Copyright (c) 1996 by Sun Microsystems, Inc.
* Copyright (c) 1999-2000 by Scriptics Corporation.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#ifndef _TKSCALE
#define _TKSCALE
#ifndef _TKINT
#include "tkInt.h"
#endif
/*
* Legal values for the "orient" field of TkScale records.
*/
enum orient {
ORIENT_HORIZONTAL, ORIENT_VERTICAL
};
/*
* Legal values for the "state" field of TkScale records.
*/
enum state {
STATE_ACTIVE, STATE_DISABLED, STATE_NORMAL
};
/*
* A data structure of the following type is kept for each scale widget
* managed by this file:
*/
typedef struct TkScale {
Tk_Window tkwin; /* Window that embodies the scale. NULL means
* that the window has been destroyed but the
* data structures haven't yet been cleaned
* up.*/
Display *display; /* Display containing widget. Used, among
* other things, so that resources can be
* freed even after tkwin has gone away. */
Tcl_Interp *interp; /* Interpreter associated with scale. */
Tcl_Command widgetCmd; /* Token for scale's widget command. */
Tk_OptionTable optionTable; /* Table that defines configuration options
* available for this widget. */
enum orient orient; /* Orientation for window (vertical or
* horizontal). */
int width; /* Desired narrow dimension of scale, in
* pixels. */
int length; /* Desired long dimension of scale, in
* pixels. */
double value; /* Current value of scale. */
Tcl_Obj *varNamePtr; /* Name of variable or NULL. If non-NULL,
* scale's value tracks the contents of this
* variable and vice versa. */
double fromValue; /* Value corresponding to left or top of
* scale. */
double toValue; /* Value corresponding to right or bottom of
* scale. */
double tickInterval; /* Distance between tick marks; 0 means don't
* display any tick marks. */
double resolution; /* If > 0, all values are rounded to an even
* multiple of this value. */
int digits; /* Number of significant digits to print in
* values. 0 means we get to choose the number
* based on resolution and/or the range of the
* scale. */
char format[16]; /* Sprintf conversion specifier computed from
* digits and other information. */
double bigIncrement; /* Amount to use for large increments to scale
* value. (0 means we pick a value). */
char *command; /* Command prefix to use when invoking Tcl
* commands because the scale value changed.
* NULL means don't invoke commands. */
int repeatDelay; /* How long to wait before auto-repeating on
* scrolling actions (in ms). */
int repeatInterval; /* Interval between autorepeats (in ms). */
char *label; /* Label to display above or to right of
* scale; NULL means don't display a label. */
TkSizeT labelLength; /* Number of non-NULL chars. in label. */
enum state state; /* Values are active, normal, or disabled.
* Value of scale cannot be changed when
* disabled. */
/*
* Information used when displaying widget:
*/
int borderWidth; /* Width of 3-D border around window. */
Tk_3DBorder bgBorder; /* Used for drawing slider and other
* background areas. */
Tk_3DBorder activeBorder; /* For drawing the slider when active. */
int sliderRelief; /* Is slider to be drawn raised, sunken,
* etc. */
XColor *troughColorPtr; /* Color for drawing trough. */
GC troughGC; /* For drawing trough. */
GC copyGC; /* Used for copying from pixmap onto screen */
Tk_Font tkfont; /* Information about text font, or NULL. */
XColor *textColorPtr; /* Color for drawing text. */
GC textGC; /* GC for drawing text in normal mode. */
int relief; /* Indicates whether window as a whole is
* raised, sunken, or flat. */
int highlightWidth; /* Width in pixels of highlight to draw around
* widget when it has the focus. <= 0 means
* don't draw a highlight. */
Tk_3DBorder highlightBorder;/* Value of -highlightbackground option:
* specifies background with which to draw 3-D
* default ring and focus highlight area when
* highlight is off. */
XColor *highlightColorPtr; /* Color for drawing traversal highlight. */
int inset; /* Total width of all borders, including
* traversal highlight and 3-D border.
* Indicates how much interior stuff must be
* offset from outside edges to leave room for
* borders. */
int sliderLength; /* Length of slider, measured in pixels along
* long dimension of scale. */
int showValue; /* Non-zero means to display the scale value
* below or to the left of the slider; zero
* means don't display the value. */
/*
* Layout information for horizontal scales, assuming that window gets the
* size it requested:
*/
int horizLabelY; /* Y-coord at which to draw label. */
int horizValueY; /* Y-coord at which to draw value text. */
int horizTroughY; /* Y-coord of top of slider trough. */
int horizTickY; /* Y-coord at which to draw tick text. */
/*
* Layout information for vertical scales, assuming that window gets the
* size it requested:
*/
int vertTickRightX; /* X-location of right side of tick-marks. */
int vertValueRightX; /* X-location of right side of value string. */
int vertTroughX; /* X-location of scale's slider trough. */
int vertLabelX; /* X-location of origin of label. */
/*
* Miscellaneous information:
*/
int fontHeight; /* Height of scale font. */
Tk_Cursor cursor; /* Current cursor for window, or None. */
Tcl_Obj *takeFocusPtr; /* Value of -takefocus option; not used in the
* C code, but used by keyboard traversal
* scripts. May be NULL. */
int flags; /* Various flags; see below for
* definitions. */
} TkScale;
/*
* Flag bits for scales:
*
* REDRAW_SLIDER - 1 means slider (and numerical readout) need to
* be redrawn.
* REDRAW_OTHER - 1 means other stuff besides slider and value
* need to be redrawn.
* REDRAW_ALL - 1 means the entire widget needs to be redrawn.
* REDRAW_PENDING - 1 means any sort of redraw is pending
* ACTIVE - 1 means the widget is active (the mouse is in
* its window).
* INVOKE_COMMAND - 1 means the scale's command needs to be
* invoked during the next redisplay (the value
* of the scale has changed since the last time
* the command was invoked).
* SETTING_VAR - 1 means that the associated variable is being
* set by us, so there's no need for ScaleVarProc
* to do anything.
* NEVER_SET - 1 means that the scale's value has never been
* set before (so must invoke -command and set
* associated variable even if the value doesn't
* appear to have changed).
* GOT_FOCUS - 1 means that the focus is currently in this
* widget.
* SCALE_DELETED - 1 means the scale widget is being deleted
*/
#define REDRAW_SLIDER (1<<0)
#define REDRAW_OTHER (1<<1)
#define REDRAW_ALL (REDRAW_OTHER|REDRAW_SLIDER)
#define REDRAW_PENDING (1<<2)
#define ACTIVE (1<<3)
#define INVOKE_COMMAND (1<<4)
#define SETTING_VAR (1<<5)
#define NEVER_SET (1<<6)
#define GOT_FOCUS (1<<7)
#define SCALE_DELETED (1<<8)
/*
* Symbolic values for the active parts of a slider. These are the values that
* may be returned by the ScaleElement procedure.
*/
#define OTHER 0
#define TROUGH1 1
#define SLIDER 2
#define TROUGH2 3
/*
* Space to leave between scale area and text, and between text and edge of
* window.
*/
#define SPACING 2
/*
* Declaration of procedures used in the implementation of the scale widget.
*/
MODULE_SCOPE void TkEventuallyRedrawScale(TkScale *scalePtr, int what);
MODULE_SCOPE double TkRoundToResolution(TkScale *scalePtr, double value);
MODULE_SCOPE TkScale * TkpCreateScale(Tk_Window tkwin);
MODULE_SCOPE void TkpDestroyScale(TkScale *scalePtr);
MODULE_SCOPE void TkpDisplayScale(ClientData clientData);
MODULE_SCOPE int TkpScaleElement(TkScale *scalePtr, int x, int y);
MODULE_SCOPE void TkScaleSetValue(TkScale *scalePtr, double value,
int setVar, int invokeCommand);
MODULE_SCOPE double TkScalePixelToValue(TkScale *scalePtr, int x, int y);
MODULE_SCOPE int TkScaleValueToPixel(TkScale *scalePtr, double value);
#endif /* _TKSCALE */
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