TLabel

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Revision as of 21:46, 15 May 2014 by Michl (talk | contribs) (Translation)
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>> LCL Components >> TLabel

This page explains how to use the TLabel component. When I mention to click on something, unless I explicitly say to right-click, you always left-click on the item in question.

Description

Control to show static text, possibly in multiple lines.

Comp Standard TLabel.png

Usage

A TLabel is one of the most basic components that you can put on a form. Most labels are the marking of other components, such as Edit fields, Memos, StringGrids and so on. TLabels provide a variety of events available to you but not required in most cases.

To change the default label Label of a new inserted TLabel on a form, you can proceed as follows:

  • On your form with one click, select the TLabel.
  • Go on properties in the Object Inspector tab.
  • Select the property Caption and change it in the next edit field.
  • In the same way, you can select the property Name and give the label a better name.

Change caption at run time

Of course, you can change the caption (the text displayed) during run time.

The following example demonstrates this:

  • Create a new GUI application with the form Form1. Add this form still a TButton Button1 and a TLabel Label1 by selecting the appropriate components on the Standard Component Tab and clicking on Form1 (the label should be above the button).
  • Create now a event handler for Button1, by simply double clicking on Button1.
  • Insert following lines of code in the OnClick event handler of Button1:
procedure TForm1.Button1Click(Sender: TObject);
const Cnt: Integer = 0;                     //Counter to determine how many times the button has been clicked
begin
  inc(Cnt);                                 //Increment the counter by 1
  Label1.Caption:='Button was clicked ' +   //Write the text on the caption of Label1
    IntToStr(Cnt) + ' times';
end;
  • Start your program and test the change of the label caption by clicking the button.

Comments

Um einen mehrzeiligen Text darzustellen, müssen Sie an die entsprechende Stelle im anzuzeigenden String ein #13 als Zeilenumbruchsignal setzen.
Beispiel: Label1.Caption:='Das'#13'ist'#13'ein'#13'mehrzeiliger'#13'Text';



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LCL Components
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Standard TMainMenu • TPopupMenu • TButton • TLabel • TEdit • TMemo • TToggleBox • TCheckBox • TRadioButton • TListBox • TComboBox • TScrollBar • TGroupBox • TRadioGroup • TCheckGroup • TPanel • TFrame • TActionList
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Data Controls TDBNavigator • TDBText • TDBEdit • TDBMemo • TDBImage • TDBListBox • TDBLookupListBox • TDBComboBox • TDBLookupComboBox • TDBCheckBox • TDBRadioGroup • TDBCalendar • TDBGroupBox • TDBGrid • TDBDateTimePicker
Data Access TDataSource • TCSVDataSet • TSdfDataSet • TBufDataset • TFixedFormatDataSet • TDbf • TMemDataset
System TTimer • TIdleTimer • TLazComponentQueue • THTMLHelpDatabase • THTMLBrowserHelpViewer • TAsyncProcess • TProcessUTF8 • TProcess • TSimpleIPCClient • TSimpleIPCServer • TXMLConfig • TEventLog • TServiceManager • TCHMHelpDatabase • TLHelpConnector
Misc TColorButton • TSpinEdit • TFloatSpinEdit • TArrow • TCalendar • TEditButton • TFileNameEdit • TDirectoryEdit • TDateEdit • TTimeEdit • TCalcEdit • TFileListBox • TFilterComboBox • TComboBoxEx • TCheckComboBox • TButtonPanel • TShellTreeView • TShellListView • TXMLPropStorage • TINIPropStorage • TJSONPropStorage • TIDEDialogLayoutStorage • TMRUManager • TStrHolder
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RTTI TTIEdit • TTIComboBox • TTIButton • TTICheckBox • TTILabel • TTIGroupBox • TTIRadioGroup • TTICheckGroup • TTICheckListBox • TTIListBox • TTIMemo • TTICalendar • TTIImage • TTIFloatSpinEdit • TTISpinEdit • TTITrackBar • TTIProgressBar • TTIMaskEdit • TTIColorButton • TMultiPropertyLink • TTIPropertyGrid • TTIGrid
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Pascal Script TPSScript • TPSScriptDebugger • TPSDllPlugin • TPSImport_Classes • TPSImport_DateUtils • TPSImport_ComObj • TPSImport_DB • TPSImport_Forms • TPSImport_Controls • TPSImport_StdCtrls • TPSCustomPlugin
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Chart TChart • TListChartSource • TRandomChartSource • TUserDefinedChartSource • TCalculatedChartSource • TDbChartSource • TChartToolset • TChartAxisTransformations • TChartStyles • TChartLegendPanel • TChartNavScrollBar • TChartNavPanel • TIntervalChartSource • TDateTimeIntervalChartSource • TChartListBox • TChartExtentLink • TChartImageList
IPro TIpFileDataProvider • TIpHtmlDataProvider • TIpHttpDataProvider • TIpHtmlPanel
Virtual Controls TVirtualDrawTree • TVirtualStringTree • TVTHeaderPopupMenu


--Michl 21:42, 15 May 2014 (CEST)