Back to Home Visual Graph Home TriSun Software Inc. Home Visual Graph Site Menu Home What is Visual Graph? Screenshots 50 Technical Features Getting Started Abundant Graphic Libraries File Format FAQ Online Demo (IE Only) Common Applications Visual Graph Getting Started Use VG Component in Delphi 6 Use VG Component in VB6 Use Graphic Library Change Element's Shape Customize Property Make Graphic Button Get the Selected Elements Dynamically Create Graph Movable Label Link Point Access Properties Use Line Vertexes Call Windows API Functions Call Visual Graph Functions Callback Control Event in Script Drag Graph in Run Mode Detail Report Make and Use Dialog Box |
Visual Graph Getting Started - Callback Control Event in ScriptAs you know, Visual Graph allows you to declare functions in a .tbl file (via Program -> Add function... menu item), and you can call them in element's event script. Besides, it provides you with DoCommand and OnCommand matching callback mechanism.DoCommand is a function in Visual Graph scripting language, it has two parameters, the first is current document, the second is a string that will be transfered to the document's related ActiveX control OnCommand event. Now, we demonstrate it through a VB6 example. 1. Create a new file in Visual Graph IDE, and then draw a circle (basic element in library group) in this document. 2. Select this circle, and then double-click OnClick event in the Functions view at left to write the follow script: DoCommand( Owner, "Hello" ) 3. Save current document as h:\test.tbl. 4. Create a new project in VB6, right-click on Toolbox and select Components, and then check Visual Graph ActiveX Control and click <OK>. 5. Click vgctrl in Toolbox, and then draw an instance on Form1. 6. Write the following code in Form_Load event: vgctrl1.Run "h:\test.tbl" 7. Write the following code in vgctrl1_OnCommand event: MsgBox ACommand 8. Run this project, click the circle, you will get a message box with Hello prompt. |
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