C# Class DynamicVizSegmenter.CustomControls.NumericUpDownTextBox

Constructor: initializes the TextBox, creates the buttons, and attaches event handlers for the buttons and TextBox

Called to arrange and size the content of a System.Windows.Controls.Control object.

Overrides System.Windows.Media.Visual.GetVisualChild(System.Int32), and returns a child at the specified index from a collection of child elements.

Works directly with the Value property to increment or decrement the integer value in the textbox

Handles up button click (ie increment TextBox value)

When mouse button is depressed over the up or down button, initiates the RepeatButton behaviour by setting up a timer

Resets the repeat button so no longer active when Mouse button released Does not matter if mouse is on button or not

Only does something if the Textbox contains an out of range number

Will fix value only if the value is beyond what could be a valid entry given more characters could be added to TextBox

Checks if any of the Keyboard modifier keys are pressed that might affect the change in the value of the TextBox. In this case only the shift key affects the value

Observes the button timer event for the repeat button functionality, and then starts the 'Value' dependency property change process Note: Cannot interact directly with UI from this event

Checks that mouse cursor is in the button, and if so updates the 'Value' dependency property

Checks if the keypress is the up or down key, and then handles keyboard input

Ensures that keypress is a valid character (numeric or negative sign) - negative sign ('-') only allowed if Minimum value less than 0, the entry is at the beginning of the text and there is not already a negative sign - number only allowed if not beginning of text and there is a negative sign