DIRECTORY Buttons USING [Button, ButtonProc, Create, ReLabel, SetDisplayStyle], ChoiceButtons, Containers USING [ChildXBound], Labels USING [Create, Label, Set], Rope USING [ROPE, Equal], ViewerClasses USING [Viewer], ViewerOps USING [AddProp, EnumProc, EnumerateChildren, FetchProp], ViewerTools USING [MakeNewTextViewer, SetContents, SetSelection], VFonts USING [CharWidth, Font, FontHeight, StringWidth, defaultFont]; ChoiceButtonsImpl: CEDAR PROGRAM IMPORTS Buttons, Containers, Labels, Rope, ViewerOps, ViewerTools, VFonts EXPORTS ChoiceButtons = BEGIN OPEN ChoiceButtons; entryHeight: CARDINAL = 15; -- how tall to make each line of items entryHSpace: CARDINAL = 10; -- horizontal space between title and selections fudge: CARDINAL = 5; -- fudge factor so that the baselines of text viewers are aligned with -- their corresponding labels on: ATOM = $WhiteOnBlack; off: ATOM = $BlackOnWhite; DefaultDoesntExist: PUBLIC SIGNAL = CODE; ChoiceDoesntExist: PUBLIC SIGNAL = CODE; ButtonsCannotBeUpdated: PUBLIC SIGNAL = CODE; ---- ---- ---- ---- ---- ---- ---- ---- BuildEnumTypeSelection: PUBLIC PROC [viewer: ViewerClasses.Viewer, x, y: CARDINAL, title: Rope.ROPE, buttonNames: ButtonList, default: Rope.ROPE, borderOnButtons: BOOLEAN, notifyClientProc: SelectionNotifierProc, permit: EnumPermissionProc, clientdata: REF ANY, style: StyleChoice, allInOneRow: BOOLEAN, maxWidth: INTEGER] RETURNS [EnumTypeRef] = BEGIN foundDefault: BOOLEAN _ FALSE; stateInfo: EnumTypeRef _ NEW[EnumTypeRec]; DefaultFound: PROC[currentName, defaultName: Rope.ROPE] RETURNS [BOOLEAN] = BEGIN IF Rope.Equal[currentName, defaultName, FALSE] THEN RETURN [foundDefault _ TRUE] ELSE RETURN [FALSE]; END; BuildMenuSelection: PROC = BEGIN border: INTEGER _ 10; startButtons: CARDINAL; startX: INTEGER _ 0; -- keeps a running tally of where the next x position is tempButton: Buttons.Button; eachButton: ButtonList; stateInfo.type _ menuStyle; IF title # NIL THEN { titleLabel: Labels.Label_ Labels.Create[[ name: title, parent: viewer, wx: x, wy: y, wh: entryHeight, border: FALSE ]]; startButtons _ titleLabel.wx + titleLabel.ww + entryHSpace; } ELSE startButtons _ x; startX _ startButtons; FOR eachButton _ buttonNames, eachButton.rest UNTIL eachButton = NIL DO IF ~allInOneRow THEN { IF startX + VFonts.StringWidth[eachButton.first, VFonts.defaultFont] + border >= maxWidth THEN { startX _ startButtons; stateInfo.nexty _ stateInfo.nexty + entryHeight; }; }; tempButton _ Buttons.Create[info: [ name: eachButton.first, wx: startX, wy: stateInfo.nexty, -- default the width so that it will be computed for us wh: entryHeight, -- specify rather than defaulting so line is uniform parent: viewer, border: borderOnButtons ], proc: MenuSelectionProc, clientData: stateInfo ]; ViewerOps.AddProp[tempButton, $ChoiceButtons, stateInfo]; IF DefaultFound[eachButton.first, default] THEN { stateInfo.buttonOn _ tempButton; Buttons.SetDisplayStyle[button: tempButton, style: on]; }; startX _ tempButton.wx + tempButton.ww; ENDLOOP; stateInfo.nextx _ startX; END; BuildFlipThru: PROCEDURE = BEGIN eachButton: ButtonList; titleButton: Buttons.Button; nextx: INTEGER _ x; IF title # NIL THEN { -- create a title button stateInfo.type _ flipThruWithTitle; titleButton _ Buttons.Create[ info: [name: title, parent: viewer, wx: nextx, wy: y, wh: entryHeight, border: TRUE ], proc: FlipThruButtonProc, clientData: stateInfo ]; nextx _ titleButton.wx + titleButton.ww + 3; } ELSE stateInfo.type _ flipThruNoTitle; FOR eachButton _ buttonNames, eachButton.rest UNTIL (eachButton = NIL) OR DefaultFound[eachButton.first, default] DO -- do nothing ENDLOOP; -- now set up the initial button IF title # NIL THEN stateInfo.flipLabel _ Labels.Create[[ name: eachButton.first, wx: nextx, wy: y, ww: MaxNameWidth[buttonNames], -- first find the longest name so we can set up the -- width properly (unfortunately when re-labeling a button, the width remains the same) wh: entryHeight, parent: viewer, border: FALSE ]] ELSE stateInfo.flipLabel _ Buttons.Create[ info: [name: eachButton.first, wx: nextx, wy: y, ww: MaxNameWidth[buttonNames], wh: entryHeight, parent: viewer, border: borderOnButtons ], proc: FlipThruButtonProc, clientData: stateInfo ]; stateInfo.nextx _ stateInfo.flipLabel.wx + stateInfo.flipLabel.ww; END; stateInfo.nextx _ x; stateInfo.nexty _ y; stateInfo.proc _ notifyClientProc; stateInfo.namesOfButtons _ buttonNames; stateInfo.clientdata _ clientdata; stateInfo.permission _ permit; IF default = NIL THEN -- set it to be the first name of the list of button names default _ buttonNames.first; SELECT style FROM menuSelection => BuildMenuSelection; flipThru => BuildFlipThru; ENDCASE => ERROR; -- signal that the default didn't exist if necessary IF ~foundDefault THEN SIGNAL DefaultDoesntExist; stateInfo.nexty _ stateInfo.nexty + entryHeight; RETURN[stateInfo]; END; MenuSelectionProc: Buttons.ButtonProc = BEGIN info: EnumTypeRef _ NARROW[clientData]; viewer: ViewerClasses.Viewer _ NARROW[parent]; IF info.permission # NIL THEN { IF info.permission[info] THEN { -- don't do anything without permission first SwitchButtons[info.buttonOn, viewer]; -- viewer is the button which was just selected info.buttonOn _ viewer; -- Notify client that change has taken place if the client provided a proc for doing this IF info.proc # NIL THEN info.proc[viewer.name, info.clientdata]; }} ELSE { SwitchButtons[info.buttonOn, viewer]; -- viewer is the button which was just selected info.buttonOn _ viewer; -- Notify client that change has taken place if the client provided a proc for doing this IF info.proc # NIL THEN info.proc[viewer.name, info.clientdata]; }; END; SwitchButtons: PRIVATE PROCEDURE[oldButton, newButton: Buttons.Button] = BEGIN -- merely changes the physical appearance of the buttons -- Switch off the previously selected button Buttons.SetDisplayStyle[button: oldButton, style: off]; -- switch "on" the newly selected button Buttons.SetDisplayStyle[button: newButton, style: on]; END; FlipThruButtonProc: Buttons.ButtonProc = BEGIN info: EnumTypeRef _ NARROW[clientData]; IF info.permission # NIL THEN { IF info.permission[info] THEN { -- don't do anything without permission first IF mouseButton=red THEN -- Display the next name in succession ViewerTools.SetContents[viewer: info.flipLabel, contents: GetNextName[info.namesOfButtons, info.flipLabel.name]] ELSE -- Display the previous name ViewerTools.SetContents[viewer: info.flipLabel, contents: GetPrevName[info.namesOfButtons, info.flipLabel.name]]; -- Notify client that change has taken place if the client provided a proc for doing this IF info.proc # NIL THEN info.proc[info.flipLabel.name, info.clientdata]; }} ELSE { IF mouseButton=red THEN -- Display the next name in succession ViewerTools.SetContents[viewer: info.flipLabel, contents: GetNextName[info.namesOfButtons, info.flipLabel.name]] ELSE -- display the previous name ViewerTools.SetContents[viewer: info.flipLabel, contents: GetPrevName[info.namesOfButtons, info.flipLabel.name]]; -- Notify client that change has taken place if the client provided a procedure for doing this IF info.proc # NIL THEN info.proc[info.flipLabel.name, info.clientdata]; }; END; UpdateChoiceButtons: PUBLIC PROCEDURE [viewer: ViewerClasses.Viewer, enumTypeInfo: EnumTypeRef, newName: Rope.ROPE] = BEGIN newButton: Buttons.Button _ NIL; GetDesiredButton: ViewerOps.EnumProc = BEGIN IF (Rope.Equal[v.name, newName, FALSE]) AND (ViewerOps.FetchProp[v, $ChoiceButtons] = enumTypeInfo) THEN { newButton _ v; RETURN [FALSE]; }; END; IF enumTypeInfo = NIL THEN SIGNAL ButtonsCannotBeUpdated; SELECT enumTypeInfo.type FROM menuStyle => {ViewerOps.EnumerateChildren[viewer, GetDesiredButton]; IF newButton # NIL THEN { SwitchButtons[enumTypeInfo.buttonOn, newButton]; enumTypeInfo.buttonOn _ newButton; } ELSE SIGNAL ChoiceDoesntExist; }; flipThruWithTitle => Labels.Set[label: enumTypeInfo.flipLabel, value: newName]; flipThruNoTitle => Buttons.ReLabel[button: enumTypeInfo.flipLabel, newName: newName]; ENDCASE => ERROR; END; GetSelectedButton: PUBLIC PROC [handle: EnumTypeRef] RETURNS [Rope.ROPE] = { IF handle.type = menuStyle THEN { IF handle.buttonOn = NIL THEN ERROR ELSE RETURN [handle.buttonOn.name] } ELSE { IF handle.flipLabel = NIL THEN ERROR ELSE RETURN[handle.flipLabel.name] }; }; GetNextName: PRIVATE PROC[listOfNames: ButtonList, currentName: Rope.ROPE] RETURNS [Rope.ROPE] = BEGIN eachButton: ButtonList _ listOfNames; WHILE (eachButton # NIL) AND (eachButton.first # currentName) DO eachButton _ eachButton.rest; ENDLOOP; IF eachButton = NIL THEN ERROR; -- This shouldn't happen; we should always be able to -- find the current button name in list of button names IF eachButton.rest = NIL THEN -- we are at the end of our list, cycle around to the beginning RETURN [listOfNames.first] ELSE RETURN [(eachButton.rest).first]; END; GetPrevName: PRIVATE PROC[listOfNames: ButtonList, currentName: Rope.ROPE] RETURNS [Rope.ROPE] = BEGIN prev: Rope.ROPE _ listOfNames.first; eachName: ChoiceButtons.ButtonList _ listOfNames.rest; WHILE (eachName # NIL) AND ~Rope.Equal[eachName.first, currentName, FALSE] DO prev _ eachName.first; eachName _ eachName.rest; ENDLOOP; RETURN[prev]; END; MaxNameWidth: PRIVATE PROC[listOfNames: ButtonList] RETURNS [CARDINAL] = BEGIN eachButton: ButtonList _ listOfNames; maxWidth: CARDINAL; IF eachButton # NIL THEN { maxWidth _ VFonts.StringWidth[string: eachButton.first, font: VFonts.defaultFont]; eachButton _ eachButton.rest } ELSE RETURN [0]; WHILE (eachButton # NIL) DO IF VFonts.StringWidth[string: eachButton.first, font: VFonts.defaultFont] > maxWidth THEN maxWidth _ VFonts.StringWidth[string: eachButton.first, font: VFonts.defaultFont]; eachButton _ eachButton.rest; ENDLOOP; maxWidth _ maxWidth + VFonts.CharWidth['M]; -- add on a little extra just to be sure RETURN[maxWidth]; END; BuildTriStateButton: PUBLIC PROCEDURE [viewer: ViewerClasses.Viewer, x,y: INTEGER, name: Rope.ROPE] RETURNS [stateInfo: ThreeStateRef, nextX: INTEGER] = { tempButton: Buttons.Button; stateInfo _ NEW[ThreeState]; tempButton _ Buttons.Create[ info: [name: name, wx: x, wy: y, -- default the width so that it will be computed for us wh: entryHeight, -- specify rather than defaulting so line is uniform parent: viewer, border: TRUE ], proc: TriSwitchProc, clientData: stateInfo -- this will be passed to our button proc ]; stateInfo.button _ tempButton; nextX _ tempButton.wx + tempButton.ww + 4; }; SetButtonState: PUBLIC PROC [buttonSelected: Buttons.Button, state: StateType] = BEGIN SELECT state FROM on => Buttons.SetDisplayStyle[button: buttonSelected, style: $WhiteOnBlack]; off => Buttons.SetDisplayStyle[button: buttonSelected, style: $BlackOnWhite]; default => Buttons.SetDisplayStyle[button: buttonSelected, style: $BlackOnGrey]; ENDCASE => ERROR; END; NextState: PROC [state: StateType] RETURNS [StateType] = BEGIN IF state = LAST[StateType] THEN RETURN[FIRST[StateType]] ELSE RETURN[SUCC[state]]; END; TriSwitchProc: Buttons.ButtonProc = BEGIN handle: ThreeStateRef _ NARROW[clientData]; handle.state _ NextState[handle.state]; -- Indicate which state this button is in. SetButtonState[handle.button, handle.state]; END; BuildTextPrompt: PUBLIC PROCEDURE [viewer: ViewerClasses.Viewer, x,y: CARDINAL, title: Rope.ROPE, default: Rope.ROPE, font: VFonts.Font, textViewerWidth: INTEGER, clientdata: REF ANY, notify: SelectionNotifierProc, permit: PromptPermissionProc] RETURNS [promptData: PromptDataRef] = BEGIN height: INTEGER _ VFonts.FontHeight[font] + 6; promptData _ NEW[PromptDataRec]; promptData.promptButton _ Buttons.Create[info: [name: title, wx: x, wy: y, wh: height, parent: viewer, border: FALSE], font: font, proc: PromptProc, clientData: promptData]; promptData.textViewer _ ViewerTools.MakeNewTextViewer [[ parent: viewer, wx: promptData.promptButton.wx + promptData.promptButton.ww + entryHSpace, wy: y + fudge, ww: textViewerWidth, wh: height - fudge, name: title, -- give it the name of the prompt associated with it data: default, scrollable: FALSE, border: FALSE ]]; IF textViewerWidth = LAST[INTEGER] THEN { Containers.ChildXBound[viewer, promptData.textViewer]; promptData.newx _ LAST[INTEGER]; } ELSE promptData.newx _ promptData.textViewer.wx + promptData.textViewer.ww; IF default # NIL THEN ViewerTools.SetContents[promptData.textViewer, default]; promptData.clientdata _ clientdata; promptData.notify _ notify; promptData.permission _ permit; promptData.newy _ y + height; END; PromptProc: Buttons.ButtonProc = BEGIN handle: PromptDataRef _ NARROW[clientData]; viewer: ViewerClasses.Viewer _ NARROW[parent]; IF handle.permission # NIL THEN { IF handle.permission[handle] THEN { -- dont do anything without permission IF mouseButton=red THEN -- make pending delete ViewerTools.SetSelection[handle.textViewer] ELSE -- notify the client if proc provided. IF handle.notify # NIL THEN handle.notify[viewer.name, handle.clientdata]; }} ELSE { IF mouseButton=red THEN -- make pending delete ViewerTools.SetSelection[handle.textViewer] ELSE -- notify the client if proc provided. IF handle.notify # NIL THEN handle.notify[viewer.name, handle.clientdata]; } END; END. N ChoiceButtonsImpl.mesa Written by Linda Gass on August 30, 1982 1:21 pm Last Edit by McGregor October 5, 1982 12:28 pm Last Edited by: Maxwell, January 3, 1983 12:35 pm force the selection into the user input field (the text viewer). 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