Panda3D Manual: DirectDialog
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DirectDialog objects are popup windows to alert or interact with the user. It is invoked just like the other DirectGUI objects, but it also has some unique keywords. Integral to DirectDialog are dialogName, buttonTextList, buttonImageList, and buttonValueList. The dialogName should ideally be the name of the NodePath created to hold the object. The button lists contain the various properties of the buttons within the dialog box. No maximum number of buttons needs to be declared. Panda3D contains a number of shortcuts for common dialog options. For example, rather than specifying the rather common text list ("Yes","No"), there is a YesNoDialog that functions exactly like a normal dialog but has buttonTextList already defined. The other similar dialogs are OkCancelDialog, OkDialog, RetryCancelDialog, and YesNoCancelDialog.
Keyword | Definition | Value
dialogName | Name of the dialog | String
buttonTextList | List of text to show on each button | [Strings]
buttonGeomList | List of geometry to show on each button | [NodePaths]
buttonImageList | List of images to show on each button | [Image Paths]
buttonValueList | List of values sent to dialog command for each button. If value is [] then the ordinal rank of the button is used as its value | [Numbers]
buttonHotKeyList | Shortcut key for each button (the button must have focus) | [Characters]
buttonSize | 4-tuple used to specify custom size for each button (to make bigger then geom/text for example) | (Left,Right,Bottom,Top)
topPad | Extra space added above text/geom/image | Number
midPad | Extra space added between text/buttons | Number
sidePad | Extra space added to either side of text/buttons | Number
buttonPadSF | Scale factor used to expand/contract button horizontal spacing | Number
command | Callback command used when a button is pressed. Value supplied to command depends on values in buttonValueList | Function
extraArgs | Extra arguments to the function specified in command | [Extra Arguments]
fadeScreen | If 1, fades screen to black when the dialog appears | 0 or 1
## YesNo Dialog Example
    import direct.directbase.DirectStart
    from direct.gui.OnscreenText import OnscreenText
    from direct.gui.DirectGui import *
    from direct.task import Task
    from direct.actor import Actor
    from direct.interval.IntervalGlobal import *

    #add some text
    bk_text = "DirectDialog- YesNoDialog Demo"
    textObject = OnscreenText(text = bk_text, pos = (0.85,0.85),
    scale = 0.07,fg=(1,0.5,0.5,1),align=TextNode.ACenter,mayChange=1)

    #add some text
    output = ""
    textObject = OnscreenText(text = output, pos = (0.95,-0.95),
     scale = 0.07,fg=(1,0.5,0.5,1),align=TextNode.ACenter,mayChange=1)

    #callback function to set  text
    def itemSel(arg):
    	if(arg):
    		output = "Button Selected is: Yes"
    	else:
    		output = "Button Selected is: No"
    	textObject.setText(output)

    #create a frame
    dialog = YesNoDialog(dialogName="YesNoCancelDialog", command=itemSel)

    base.camera.setPos(0,-20,0)
    #run the tutorial
    run()
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