11/10/2022 0 Comments Delphi 7 listbox selected item![]() You don't determine the character to display, but whether to echo the entered text or display an asterisk instead. Another is that the PasswordChar property is replaced by the EchoMode property. If it's not, you change the value of the key to the null character ( #0), so that it won't be processed by the edit control and will produce a warning beep:īegin // check if the key is a number or backspace if not (Key in ) then beginĪ minor difference of CLX is that the Edit control has no built-in Undo mechanism. For example, you can write a method that tests whether the character is a number or the Backspace key (which has a numerical value of 8). If you want to accept only specific characters, you can handle the OnKeyPress event of the edit box. The only condition you can impose on user input is the number of characters to accept. ![]() The Edit component uses the Text property, whereas many other controls use the Caption property to refer to the text they display. ![]() In CLX, there is also a native LCD digit control you can use to display numbers. ![]() You can also display a single line of text with a Label or a StaticText control, but these components are generally used only for fixed text or program-generated output, not for input. The Edit component allows the user to enter a single line of text. For example, in an Edit control you use the Text property, whereas in a DBEdit component you access the Value of the related field object. As you'll see in Chapter 13, "Delphi's Database Architecture," the DB version of a control typically serves a role similar to that of its "standard" equivalent but the properties and the ways you use it are often quite different. For this reason, I've provided a highly condensed summary of alternative options for a few common tasks.įor some of the controls described in the following sections, Delphi also includes a data-aware version, usually indicated by the DB prefix. There are many considerations, depending on what you want your application to do. Which should you use? That's difficult to say. For example, you can show a list of values using a list box, a combo box, a radio group, a string grid, a list view, or even a tree view if there is a hierarchical order. The problem is that for every operation, there are multiple alternatives. You open a new Delphi project and find yourself faced with a large number of components. _, you want to write a Delphi application. _TfrxListBoxControl := TfrxListBoxControl(Instance) adds new properties and methods to the scriptĬvClass := GlobalScriptObj.FindClass('TfrxListBoxControl') ĬvClass.AddIndexProperty('Selected', 'Integer', 'Boolean', CallMethod, False) įunction TdtmRelatorios.CallMethod(Instance: TObject ClassType: TClass Ĭonst MethodName: String var Params: Variant): Variant Create of the dataModule that I'm using as a Reports' repository I put the folowing lines: ![]() So I found out a way after hours of research: () īut my boss is really nitty-greedy and wanted me to find out a way of doing this with that very component (TfrxListBoxControl). Here is Script example (simply get up script in report). Somebody other time told me to use the AddMethod and AddClass thing but I don't even know what that is supposed to be. I appreciate any helpful answer, however, as I said, I'm still a beginner to delphi and I wont understand if the answer is too generic. This is an example of what I'm trying to do:įunction GetFirstSelection(List: TfrxListBoxControl): Integer įor Result := 0 to - 1 do Probably the main problem is that I'm a beginner in Delphi and programming stuffs but I'm pretty sure that property is not doing what it is suposed to do.ĭoes anybody know a workaround for that or maybe a way of using that property itself? and for that, I need to use that property "SELECTED" so that I am able to know from which do I have to take off of the Source listbox and send to the Destination Listbox. I'm trying to do the classical "what do I have" and the "what do I want" listbox type of wizard. I'm having a lot of troubles with this property "SELECTED" (at least that is the property when I use the TListBox class in delphi). I'm building this report that contains a dual list type of wizard in order to get some parameters prior to showing the report. ![]()
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