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Custom Classes II

D101 Software Developmemt. Custom Classes II. Content. Custom Class Methods Returning Derived Values Area Height Picture Box Positioning Absolute Positioning Relative Positioning ToolTips. Learning Outcomes.

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Custom Classes II

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  1. D101 Software Developmemt Custom Classes II

  2. Content • Custom Class Methods • Returning Derived Values • Area • Height • Picture Box Positioning • Absolute Positioning • Relative Positioning • ToolTips

  3. Learning Outcomes • Write custom class methods that return derived values (e.g. area, total height) • Use absolute positioning to position picture boxes • Use relative positioning to position picture boxes • Implement static and dynamic tool tip text

  4. Custom Class Methods • Derived Values: • A derived value is a value that can be figured out based on another information • It therefore does not need to be stored as it’s own value • Using derived values increase efficiency and accuracy of code

  5. Derived Values VS

  6. Derived Values VS

  7. Derived Values VS

  8. Derived Values • What is the area of these two picture boxes? • Blue is: • 10 wide • 70 high • Red is: • 70 wide • 10 high

  9. Positioning • Every C# Control has a location property • The location property consists of an X and Y integer value • These are coordinates • The X and Y values determine the location of the top left corner of the control • X is the number of pixels across • Y is the number of pixels down

  10. Positioning • The position of a picture box can be set as follows: X Y

  11. Positioning • The X and Y coordinates can be set individually using the Left and Top properties • X = Left • Y = Top

  12. Positioning • Picture Box at location 0,0

  13. Positioning • Picture Box at location 0, 40

  14. Positioning • Picture box at location 40, 0

  15. Positioning • Picture Box at location 40, 40

  16. Positioning • Example Application (absolute positioning) tbxX tbxY

  17. Positioning • Location 0,0 is in the top left corner of the From • However, for controls located inside a panel, Location 0,0 becomes the top left corner of the Panel

  18. Positioning • The Picture Box is in Location 40, 0

  19. Positioning • Horizontally centering a picture box How do we figure out where the top left corner should be? Are there other values we can derive it from?

  20. Positioning • Horizontally centering a picture box in a panel Good Reminder - Follow this link

  21. Positioning • Horizontally centering a picture box relative to another picture box

  22. Positioning • Relative Positioning

  23. Positioning • Horizontally centering a picture box relative to another picture box (relative positioning)

  24. Tool Tips • Introducing the ToolTip control

  25. ToolTips • Once a ToolTip control has been added to the project it can be used to add tool tips to multiple controls • This text shows up when the mouse hovers

  26. ToolTips • Changing the ToolTip Text dynamically at runtime

  27. Review • Can you: • Write custom class methods that return derived values (e.g. area, total height)? • Use absolute positioning to position picture boxes? • Use relative positioning to position picture boxes? • Implement static and dynamic tool tip text?

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