Difference between revisions of "Event Sequences in Visual Basic VB6"
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Revision as of 10:07, 17 January 2008
| Action | Events triggered (in order) | |
| form load | Form_Load Form_Resize Form_Activate firsttabindexcontrol_GotFocus Form_Paint | |
| form minimize | Form_Resize | |
| form restore from icon | Form_Paint (note: no Form_Resize) | |
| form maximize | Form_Resize Form_MouseMove (note: even with no mouse movement!) Form_Paint | |
| form restore from max | Form_Resize | |
| form move by drag | Form_MouseMove... | |
| form resize by drag | Form_MouseMove... Form_Resize Form_Paint Form_MouseMove... (note 2nd 'relative' move) | |
| form close | Form_QueryUnload Form_Unload | |
| click in text box | Text1_MouseMove... (only when Text1.Enabled is True) (sets Text1.SelStart BEFORE MouseDown event) Text1_MouseDown (note: before LostFocus!) prevcontrol_LostFocus Text1_GotFocus Text1_MouseUp Text1_Click | |
| single character in text box | Text1_MouseMove... Form_KeyDown (if Form.KeyPreview is True) Text1_KeyDown Form_KeyPress (if Form.KeyPreview is True) Text1_KeyPress Text1_Change Form_KeyUp (if Form.KeyPreview is True) Text1_KeyUp | |
| combo box set by listindex | Combo1_Click (note: no Change event!) | |
| single character in combo box | Combo1_GotFocus Combo1_KeyDown Combo1_KeyPress Combo1_Change Combo1_KeyUp | |
| combo box select | Combo1_DropDown (note: before GotFocus!) Combo1_GotFocus Combo1_Click (note: no Change event!) | |
| click on grid cell | Grid1_RowColChange (note: before GotFocus!) Grid1_MouseDown Grid1_GotFocus Grid1_SelChange Grid1_MouseUp Grid1_Click | |
| click on Command1 while in Text1 | Form_MouseMove... Command1_MouseDown (note: before LostFocus!) Text1_LostFocus Command1_GotFocus Command1_Click (note: before MouseUp!) Command1_MouseUp | |
| tab from Text1 to Text2 | Text1_LostFocus (note: LostFocus before GotFocus) Text2_GotFocus | |
- When you click on a control other than the current one, the MouseDown event happens BEFORE the previous control's LostFocus event, and BEFORE the new control's GotFocus event. One valuable use of this is that you can detect the user clicking the Cancel button and programatically avoid running data validation in the LostFocus event of whatever field they were in before clicking Cancel.
- The Click event for a Command button happens BEFORE the MouseUp event, while for most other controls, it happens AFTER the MouseUp event.
- A number of controls have events that happen BEFORE the GotFocus event. For example, you can build or adjust the list of a ComboBox in the DropDown event before GotFocus. In the Grid control, you get a RowColChange event before the GotFocus event.
- When you click in a TextBox, the SelStart property is set (based on the position of the mouse) before ANY other event takes place.
