DIRECTORY
Cursors USING [CursorType],
GraphicsBasic USING [Color, white],
Imager USING [Box, Color, Context, MaskBox, SetColor],
ImagerOps USING [Color, ColorFromGraphicsColor, ImagerFromGraphics],
InputFocus USING [CaptureButtons, ReleaseButtons],
Process USING [Detach, Milliseconds, MsecToTicks, SetTimeout],
Sliders USING [FilterProc, NormalizedSliderValue, Reason, Slider, sliderGray, SliderOrientation, SliderProc],
TIPUser USING [InstantiateNewTIPTable, TIPScreenCoords, TIPScreenCoordsRec],
ViewerClasses USING [GetProc, NotifyProc, PaintProc, SetProc, Viewer, ViewerClass, ViewerClassRec, ViewerRec],
ViewerOps USING [CreateViewer, GetViewer, MouseInViewer, PaintViewer, RegisterViewerClass, SetViewer, UserToScreenCoords],
WindowManager USING [RestoreCursor];


SlidersImpl: CEDAR MONITOR
IMPORTS Imager, ImagerOps, InputFocus, Process, TIPUser, ViewerOps, WindowManager
EXPORTS Sliders
= BEGIN OPEN Sliders;

SliderState: TYPE = {inputDisabled, inputEnabled};
SliderValue: TYPE = REAL;					-- in range [0.0, 1.0]
SliderData: TYPE = REF SliderDataRec; 
SliderDataRec: TYPE = RECORD [
sliderProc: SliderProc _ NIL,			-- client procedure called when slider value changed
filterProc: FilterProc _ NIL,			-- client procedure for filtering slider updates
orientation: SliderOrientation,			-- orientation of slider image (horizontal or vertical)
foreground: Imager.Color,				-- color of slider foreground
background: Imager.Color,				-- color of slider background
normalizedSliderValue: NormalizedSliderValue _ 0.0,	-- in range [0.0, 1.0]
mouseValue: SliderValue _ 0.0,		-- mouse position in slider
sliderValue: SliderValue _ 0.0,		-- slider value in viewer screen coordinates
maxSliderValue: SliderValue _ 0.0,	-- maximum slider value in viewer screen coordinates
oldSliderValue: SliderValue _ 0.0,		-- previous value in viewer screen coordinates
savedSliderValue: SliderValue _ 0.0,	-- value to rollback to if operation aborted
reason: Reason _ move,					-- reason for calling client proc
oldReason: Reason _ move,				-- reason for calling client proc the last time
state: SliderState _ inputDisabled,		-- indicates whether mouse input is being accepted
clientData: REF ANY
];

Create: PUBLIC PROCEDURE [info: ViewerClasses.ViewerRec _ [], sliderProc: SliderProc _ NIL, filterProc: FilterProc _ NIL, orientation: SliderOrientation _ vertical, foreground: GraphicsBasic.Color _ sliderGray, background: GraphicsBasic.Color _ GraphicsBasic.white, value: NormalizedSliderValue _ 0.0, clientData: REF ANY _ NIL, paint: BOOL _ TRUE] RETURNS [slider: Slider] = {
sliderData: SliderData _ NEW[SliderDataRec _ [
sliderProc: sliderProc, filterProc: filterProc, orientation: orientation,
foreground: ImagerOps.ColorFromGraphicsColor[foreground],
background: ImagerOps.ColorFromGraphicsColor[background],
normalizedSliderValue: value, clientData: clientData]];
info.data _ sliderData;
info.scrollable _ FALSE;
RETURN[ViewerOps.CreateViewer[flavor: $Slider, info: info, paint: paint]];
};

GetContents: PUBLIC PROCEDURE [slider: Slider] RETURNS [contents: NormalizedSliderValue] = {
RETURN[NARROW[ViewerOps.GetViewer[viewer: slider], REF NormalizedSliderValue]^];
};

SetContents: PUBLIC PROCEDURE [slider: Slider, contents: NormalizedSliderValue] = {
value: REF NormalizedSliderValue _ NEW[NormalizedSliderValue _ contents];
ViewerOps.SetViewer[viewer: slider, data: value];
};

SlidersPaint: PRIVATE ViewerClasses.PaintProc = {
min, max: REAL;
imager: Imager.Context ~ ImagerOps.ImagerFromGraphics[context];
sliderData: SliderData _ NARROW[self.data];
box: Imager.Box _ [0, 0, self.cw, self.ch];
SELECT whatChanged FROM
NIL => {
Imager.SetColor[imager, sliderData.background];
Imager.MaskBox[imager, box];
SetMaxSliderValue[self];
SetSliderValue[sliderData, sliderData.normalizedSliderValue];
min _ 0.0;
max _ sliderData.sliderValue;
Imager.SetColor[imager, sliderData.foreground];
};
$sliderValue => {
IF sliderData.oldSliderValue <= sliderData.sliderValue THEN {
min _ sliderData.oldSliderValue;
max _ sliderData.sliderValue;
Imager.SetColor[imager, sliderData.foreground];
}
ELSE {
min _ sliderData.sliderValue;
max _ sliderData.oldSliderValue;
Imager.SetColor[imager, sliderData.background];
};
};
ENDCASE => ERROR;
IF sliderData.orientation = horizontal THEN {
box.xmin _ min;
box.xmax _ max;
}
ELSE {
box.ymin _ min;
box.ymax _ max;
};
Imager.MaskBox[imager, box]; 
sliderData.oldSliderValue _ sliderData.sliderValue;
};

SetMaxSliderValue: PROCEDURE [slider: Slider] = {
sliderData: SliderData _ NARROW[slider.data];
sliderData.maxSliderValue _ IF sliderData.orientation = horizontal THEN slider.cw ELSE slider.ch;
IF sliderData.maxSliderValue < 1.0 THEN sliderData.maxSliderValue _ 1.0;
};

SlidersGet: PRIVATE ViewerClasses.GetProc = {
sliderData: SliderData _ NARROW[self.data];
RETURN[NEW[NormalizedSliderValue _ sliderData.normalizedSliderValue]];
};

SlidersSet: PRIVATE ENTRY ViewerClasses.SetProc = {
dataValue: REF NormalizedSliderValue _ NARROW[data];
sliderData: SliderData _ NARROW[self.data];
SetSliderValue[sliderData, dataValue^];
ViewerOps.PaintViewer[viewer: self, hint: client, clearClient: FALSE, whatChanged: $sliderValue];
};

SetSliderValue: PRIVATE PROCEDURE [sliderData: SliderData, normalizedValue: NormalizedSliderValue] = {
SELECT normalizedValue FROM
< 0.0 => normalizedValue _ 0.0;
> 1.0 => normalizedValue _ 1.0;
ENDCASE;
sliderData.normalizedSliderValue _ normalizedValue;
sliderData.sliderValue _ sliderData.normalizedSliderValue * sliderData.maxSliderValue;
};

SlidersNotify: PRIVATE ViewerClasses.NotifyProc = TRUSTED {
ENABLE UNWIND => { InputFocus.ReleaseButtons[]; WindowManager.RestoreCursor[] };
v: ViewerClasses.Viewer;
c: BOOLEAN;
mouse: TIPUser.TIPScreenCoords;
mouseValue: SliderValue;
mouseScreenCoords: TIPUser.TIPScreenCoords _ NEW[TIPUser.TIPScreenCoordsRec];
sliderData: SliderData _ NARROW[self.data];
FOR list: LIST OF REF ANY _ input, list.rest UNTIL list = NIL DO
WITH list.first SELECT FROM
x: ATOM => SELECT x FROM
$Enable => {
InputFocus.CaptureButtons[proc: SlidersNotify, tip: slidersClass.tipTable, viewer: self];
sliderData.state _ inputEnabled;
sliderData.savedSliderValue _ sliderData.sliderValue;
mouseValue _ IF sliderData.orientation = horizontal THEN mouse.mouseX ELSE mouse.mouseY;
SetNewSliderValue[sliderData: sliderData, value: mouseValue, reason: move];
CreateSliderProcess[self];
};
$Abort => {
InputFocus.ReleaseButtons[];
sliderData.state _ inputDisabled;
SetNewSliderValue[sliderData: sliderData, value: sliderData.savedSliderValue, reason: abort];
sliderProcessData.state _ dying;
};
$Move => IF sliderData.state = inputEnabled THEN {
mouseScreenCoords^ _ mouse^;
[v, c] _ ViewerOps.MouseInViewer[mouse];
IF v = self AND c THEN
 mouseValue _ 
 IF sliderData.orientation = horizontal THEN mouse.mouseX ELSE mouse.mouseY
ELSE IF MouseAboveSlider[self: self, coords: mouseScreenCoords] THEN
 mouseValue _ sliderData.maxSliderValue
ELSE IF MouseBelowSlider[self: self, coords: mouseScreenCoords] THEN
 mouseValue _ 0.0
ELSE mouseValue _ sliderData.mouseValue;
SetNewSliderValue[sliderData: sliderData, value: mouseValue, reason: move];
};
$Set => IF sliderData.state = inputEnabled THEN {
reason: Reason _ set;
InputFocus.ReleaseButtons[];
sliderData.state _ inputDisabled;
mouseScreenCoords^ _ mouse^;
[v, c] _ ViewerOps.MouseInViewer[mouse];
IF v = self AND c THEN
 mouseValue _ 
 IF sliderData.orientation = horizontal THEN mouse.mouseX ELSE mouse.mouseY
ELSE IF MouseAboveSlider[self: self, coords: mouseScreenCoords] THEN
 mouseValue _ sliderData.maxSliderValue
ELSE IF MouseBelowSlider[self: self, coords: mouseScreenCoords] THEN
 mouseValue _ 0.0
ELSE {
mouseValue _ sliderData.savedSliderValue;
reason _ abort;
};
SetNewSliderValue[sliderData: sliderData, value: mouseValue, reason: reason];
sliderProcessData.state _ dying;
};
ENDCASE	=> NULL;
z: TIPUser.TIPScreenCoords => mouse _ z;
ENDCASE => ERROR;
ENDLOOP;
};
SetNewSliderValue: PRIVATE ENTRY PROCEDURE [sliderData: SliderData, value: SliderValue, reason: Reason] = {
sliderData.mouseValue _ value;
sliderData.reason _ reason;
};

MouseAboveSlider: PRIVATE PROCEDURE [self: Slider, coords: TIPUser.TIPScreenCoords] RETURNS [above: BOOLEAN] = {
cornerX, cornerY: INTEGER;
sliderData: SliderData _ NARROW[self.data];
IF sliderData.orientation = horizontal THEN {
[cornerX, cornerY] _ ViewerOps.UserToScreenCoords[self: self, vx: self.ww-2, vy: 0];
IF coords.mouseX > cornerX AND coords.mouseY >= cornerY AND coords.mouseY < cornerY + self.wh THEN RETURN[TRUE];
}
ELSE {
[cornerX, cornerY] _ ViewerOps.UserToScreenCoords[self: self, vx: 0, vy: self.wh-2];
IF coords.mouseY > cornerY AND coords.mouseX >= cornerX AND coords.mouseX < cornerX + self.ww THEN RETURN[TRUE];
};
RETURN[FALSE];
};

MouseBelowSlider: PRIVATE PROCEDURE [self: Slider, coords: TIPUser.TIPScreenCoords] RETURNS [below: BOOLEAN] = {
cornerX, cornerY: INTEGER;
sliderData: SliderData _ NARROW[self.data];
[cornerX, cornerY] _ ViewerOps.UserToScreenCoords[self: self, vx: 0, vy: 0];
IF sliderData.orientation = horizontal THEN {
IF coords.mouseX < cornerX AND coords.mouseY >= cornerY AND coords.mouseY < cornerY + self.wh THEN RETURN[TRUE];
}
ELSE {
IF coords.mouseY < cornerY AND coords.mouseX >= cornerX AND coords.mouseX < cornerX + self.ww THEN RETURN[TRUE];
};
RETURN[FALSE];
};

SliderProcessData: TYPE = REF SliderProcessDataRec;
SliderProcessDataRec: TYPE = RECORD [
slider: Slider _ NIL,
timerCondition: CONDITION,
state: SliderProcessState _ alive
];
SliderProcessState: TYPE = {alive, dying};

sliderProcessData: SliderProcessData _ NIL;

CreateSliderProcess: PRIVATE PROCEDURE [slider: Slider] = {
sliderProcessData _ NEW[SliderProcessDataRec];
sliderProcessData.slider _ slider;
TRUSTED {Process.Detach[FORK SliderProcess[sliderProcessData]]};
};

SliderProcess: PRIVATE PROCEDURE [myData: SliderProcessData] = {
UpdateSliderValue: PROCEDURE [self: Slider] = {
sliderData: SliderData _ NARROW[self.data];
notifyClient: BOOLEAN;
reason: Reason;
normalizedValue: NormalizedSliderValue;
[notifyClient, reason, normalizedValue] _ UpdateSlider[self];
IF sliderData.sliderProc # NIL AND notifyClient THEN sliderData.sliderProc[slider: self, reason: reason, value: normalizedValue, clientData: sliderData.clientData];
};
timerPeriod: Process.Milliseconds = 40;
WHILE myData.state = alive DO
UpdateSliderValue[myData.slider];
Wait[myData, timerPeriod];
ENDLOOP;
UpdateSliderValue[myData.slider];
};

UpdateSlider: PRIVATE ENTRY PROCEDURE [self: Slider] RETURNS [notifyClient: BOOLEAN, reason: Reason, normalizedValue: NormalizedSliderValue] = {
sliderData: SliderData _ NARROW[self.data];
value: NormalizedSliderValue;
notifyClient _ FALSE;
IF sliderData.mouseValue # sliderData.oldSliderValue THEN {
notifyClient _ TRUE;
value _ sliderData.mouseValue / sliderData.maxSliderValue;
IF sliderData.filterProc # NIL THEN value _ sliderData.filterProc[value, sliderData.clientData];
SetSliderValue[sliderData, value];
IF sliderData.sliderValue # sliderData.oldSliderValue THEN {
notifyClient _ TRUE;
ViewerOps.PaintViewer[viewer: self, hint: client, clearClient: FALSE, whatChanged: $sliderValue];
};
};
IF sliderData.reason # sliderData.oldReason THEN notifyClient _ TRUE;
sliderData.oldReason _ sliderData.reason;
RETURN[notifyClient, sliderData.reason, sliderData.normalizedSliderValue];
};

Wait: PRIVATE ENTRY PROCEDURE [data: SliderProcessData, milliseconds: Process.Milliseconds] = {
TRUSTED {Process.SetTimeout[@data.timerCondition, Process.MsecToTicks[milliseconds]]};
WAIT data.timerCondition;
};
slidersClass: ViewerClasses.ViewerClass _ NEW[ViewerClasses.ViewerClassRec _ [
paint: SlidersPaint,
get: SlidersGet,
set: SlidersSet,
notify: SlidersNotify,
tipTable: TIPUser.InstantiateNewTIPTable["Slider.tip"],
cursor: crossHairsCircle
]];

ViewerOps.RegisterViewerClass[$Slider, slidersClass];

END.

œSlidersImpl.mesa
Copyright c 1983, 1984 Xerox Corporation.  All rights reserved.
Written by Darlene Plebon on June 22, 1983 1:16 pm
Last Edited by: Beach, June 22, 1983 6:15 pm
Doug Wyatt, September 5, 1984 3:13:38 pm PDT


slidersClass is a record containing the procedures and data common to all slidersClass viewer instances (class record).
Register the Sliders class of viewer with the Window Manager
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