Ope n in g On e W in dow s For m w it h An ot h e r in VB.NET

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Ope n in g On e W in dow s For m w it h An ot h e r
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A form can open anot her form as a m odal form or a m odeless form . A m odal form doesn t allow t he user t o act ivat e anot her form unt il t he m odal form is closed. A m essage box is an exam ple of a m odal form . Users hav e t o respond t o t he m essage box before t hey can proceed t o any ot her form . A m odeless form does allow users t o act ivat e anot her form befor e t hey close t he m odeless form . A t oolbar is an exam ple of a m odeless form . The Find dialog box t hat you can open by choosing Find And Replace and t hen Find from t he Edit m enu in Visual St udio is an exam ple of a m odeless form . You can search for a st r ing, sw it ch t he focus away from t he Find dialog box, and t hen t ransfer t he focus back t o t he Find dialog box t o search for anot her incidence of a st ring. A form doesn t hav e a m odal or m odeless propert y . I nst ead, you can open a form wit h m et hods t hat expose it as eit her a m odal or a m odeless form . I nv oke t he ShowDialog m et hod for a form t o open it as a m odal form . To open a for m as a m odeless form , inv oke it s Show m et hod. Figur e 9- 4 shows a pair of form s wit h t he capt ions Form 1 and Form 2. These for m s belong t o a Windows applicat ion nam ed CallOneForm From Anot her. When a user clicks t he but t on on Form 1, t he but t on s Click ev ent procedure inv ok es a procedur e nam ed OpenForm 2. This procedure can open Form 2 as eit her a m odal or a m odeless form . For m 1 also has a label cont rol. This label cont r ol accent uat es t he form s nam e beyond t he inform at ion in t he form capt ion. Form 2 cont ains t hr ee cont rols: a label, a t ext box, and a but t on. The label in Form 2 ser ves t he sam e purpose as t he one in Form 1. The t ext box in Form 2 is for display ing whet her t he form is open as a m odal or a m odeless form . The applicat ion assigns t he Text pr opert y of Tex t Box1 at r un t im e. But t on1 closes Form 2 in r esponse t o a click.
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Figu r e 9 - 4 . A de sign view of a p a ir of form s u se d in t h e Ca llOn e For m From An ot h e r sa m ple.
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Som e of t he form cont r ols for t he Windows applicat ion have st at ic propert y set t ings t hat don t change at run t im e. When y ou have cont rols lik e t his, you can assign t he propert y set t ings at design t im e. For exam ple, you can change t he Text pr opert y of Label1 in eit her form in t he Propert ies w indow. When a form or it s cont rols have dy nam ic pr opert y set t ings t hat can change at run t im e in response t o user act ions, your applicat ion s code m ak es t he propert y set t ings. The follow ing list ing cont ains t w o ev ent procedures and a sub procedur e. These procedur es, which m ak e up t he cust om code behind Form 1, m ak e dy nam ic propert y set t ings and handle int eract ion w it h t he user. The Form 1_Load ev ent procedur e m akes t hr ee dy nam ic pr opert y set t ings. First it posit ions t he form t ow ard t he upper left cor ner of t he deskt op w it h a set t ing t hat is 100 pix els dow n and 100 pix els t o t he left from t he upper left corner . Next t he procedur e widens t he widt h of But t on1 from it s default set t ing of 75 pix els t o a new set t ing of 85 pix els. This ext ra w idt h perm it s t he display of t he full Text propert y set t ing for But t on1, w hich t he pr ocedur e s last line assigns. The But t on1_Click ev ent procedure cont ains a single line of code t hat invok es t he OpenForm 2 procedure. This st andard sub pr ocedur e present s as m any as t wo m essage box es. The first m essage box asks whet her t o open Form 2 as a m odal for m . I f t he user clicks t he Yes but t on, t he procedur e execut es a block of code t o achiev e t hat purpose. Not ice t he use of t he ShowDialog m et hod t o open t he form in t his code block. Ot herw ise, t he second m essage box appears w it h a prom pt t o open Form 2 as a m odeless form . I f t he user clicks t he OK but t on, t he applicat ion opens Form 2 as a m odeless form w it h t he Show m et hod. The user can close t he m essage box w it hout opening Form 2 by click ing t he Cancel but t on. Recall t hat a m essage box is a m odal form . Therefore, y ou m ust offer an opport unit y t o close a m essage box for an applicat ion t o proceed. Private Sub Form1_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Position the form toward top left area of desktop, widen Button1 s width from its default setting of 75 pixels and assign a caption for Button1 as its Text property. Me.DesktopLocation = New Point(100, 100) Button1.Width = 85 Button1.Text = Open Form 2" End Sub Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click
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Invoke the OpenForm2 procedure. OpenForm2() End Sub Sub OpenForm2() Declare a pointer reference for Form2. Dim MyFormPointer As New Form2() Assign Text property for Button1 in Form2. MyFormPointer.Button1.Text = Close" Open a new instance of Form2 as a modal form or a modeless form. When opening Form2 as a modal form, 1. Assign a value to the Text property of TextBox1. 2. Assign a start position 400 pixels down the page. 3. Use the ShowDialog method for the object reference. pointing at Form2 When opening Form2 as a modeless form, 1. Assign a start position 200 pixels down the page 2. Use the Show method for the object reference pointing at Form2. 3. Assign a value to the Text property of TextBox1. If MsgBox( Open Form2 as Modal", MsgBoxStyle.YesNo) = _ MsgBoxResult.Yes Then MyFormPointer.TextBox1.Text = I am modal." MyFormPointer.Downpix = 400 MyFormPointer.ShowDialog() ElseIf MsgBox( OK, I am opening Form2 as a Modeless form.", _ MsgBoxStyle.OKCancel) = MsgBoxResult.OK Then MyFormPointer.Downpix = 200 MyFormPointer.Show() MyFormPointer.TextBox1.Text = I am modeless." End If End Sub The code blocks for opening Form 2 as a m odal or m odeless form vary in m or e way s t han j ust t he use of t he m et hod t o open t he form . For t he block t hat opens Form 2 as a m odal form , t he block st art s by set t ing t he Text pr opert y of Text Box1 on Form 2. Visual Basic doesn t allow y ou t o dy nam ically set t he Text propert y of Text Box1 when Form 2 is open as a m odal form . Therefore, t he applicat ion m ak es t he set t ing befor e opening t he form . I n t he case of a m odeless form , t he applicat ion set s t he Tex t propert y for Text Box1 aft er t he form opens. Downpix is t he cust om Form 2 propert y t hat det erm ines how far dow n on t he desk t op Form 2 appears. By vary ing t he value of Dow npix depending on w het her Form 2 opens as a m odal or m odeless form , t he applicat ion m ak es it easier t o ident ify how Form 2 is open. Because t he Downpix propert y det erm ines w her e t he form opens on t he deskt op, you nat urally have t o specify t he propert y s value before opening t he for m . The cust om code behind Form 2 consist s of t he t wo ev ent procedures in t he follow ing code sam ple along wit h a Public var iable declarat ion. The Public declarat ion is for t he Downpix var iable. The For m 2_Load ev ent pr ocedure uses t he value of t his var iable t o specify t he posit ion for opening Form 2 on t he deskt op. The ev ent pr ocedur e also dy nam ically set s t he Text pr opert y for But t on1. The But t on1_Click ev ent procedur e dem onst rat es t he synt ax for closing a form program m at ically wit hout using t he st andard Close but t on on form s. Using
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t he Close m et hod is appropr iat e for sit uat ions in which you have t o per form som e special funct ions at t he t im e t hat a form closes.
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