Activity 3: Designing the form in VB.NET

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Activity 3: Designing the form
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The main control on the WPMCalculator form will be a TextBox with its MultiLine property set to True so that it can display a large block of text Apart from this, we will need only buttons to Stop and Reset a typing trial, and some Label controls for displaying results The form layout is shown in Figure A82 To create this form, add controls and set properties as shown in Table A81
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Figure A82
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Form layout for the WPMCalculator
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Table A81
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Controls on the WPMCalculator form, and their settings
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Control Form TextBox
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Property Name Text Name Text Multiline Anchor
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Setting frmWPM "WPMCalculator" txtTypeText "" <blank> True Top, Bottom, Left, Right btnStop "Stop" False btnReset "Reset" lblTime "Time =" lblWords "Words =" lblRate "Rate =" Tick 500 False
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Comment
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Programmatic name for the form Caption on the form The user s typing area The initial text when the control is rst displayed Allows text to be entered and displayed over a number of lines Sets the edges of the TextBox so that they stay a xed distance from the edges of the form (TextBox resizes with form) Used to stop the timer so that WPM count does not continue Caption on the button Initially disable the button Used to reset the WPM count by destroying the WPMTimer and disabling the Stop button Caption on the button Display element for time Initial display text Display element for word count Display text Display element for WPM count Display text A Timer control to initiate periodic WPM calculations 500 milli-seconds, so the timer will re the Tick event twice a second Initially the timer is disabled (default)
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Label Label Label Timer
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Name Text Name Text Name Text Name Interval Enabled
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Practical Activities
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Once you have added and set the controls on the form as per Table A81, run the application and make sure the TextBox resizes as you would expect it to (it should maintain an even distance to all four form edges as the form is resized) Note that the Timer control is con gured to re a Tick event every half-second This will ensure that the seconds count in the elapsed time display is up to date We can now go on to the nal stage, which is to create event-handlers to perform the operations necessary to manage a WPM count
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Activity 4: Event-handlers for the form
All of the event-handlers on the form will have some effect on a WMPTimer object, and so we will need to declare this as a Private form member variable Immediately after the class code (ie after End Class), add the statement:
Private T As WPMTimer
This will be the reference variable that will allow access to an instance of the WPMTimer class for performing calculations All of the manipulations of this object will be in response to events from the form controls The events we need to deal with are: 1 The user presses a key while the TextBox is in focus This will create a new WPMTimer object and initiate WPM calculation if the event has not been red before Otherwise, it will do nothing It is much easier for the user to simply start counting at the rst key-press than to expect the user to press a button and then start typing The Stop button should also be enabled so the user can end the WPM timing and calculation 2 The Timer control res a Tick event every half-second This will cause the WPMTimer object to recalculate elapsed time, word count and WPM values for display on the form The appropriate values will be transferred to the Label controls 3 The user presses the Stop button This should disable the timer to stop WPM calculations from being made and the display from being updated 4 The user presses the Reset button This should return the program to its initial state, disabling the Stop button and destroying the WPMTimer object Coding for these (and the WPMTimer variable declaration) is shown in Listing A83 Remember that you should not enter the rst or last lines of an event-handler, but simply double-click on the control that is to re the event, and for non-default events, select the control and event from the combo boxes at the top of the Code window
: Private T As WPMTimer Private Sub txtTypeText_KeyPress(ByVal sender As Object, _ ByVal e As SystemWindowsFormsKeyPressEventArgs) _ Handles txtTypeTextKeyPress