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CST238 Week 4

CST238 Week 4. Questions / Concerns? Announcements Start thinking about project ideas Test#1 next Monday, 4/28/14 Recap Check-off Take Home Lab#3 New topics Dialogs (user-defined dialogs) Timer control DateTime object Richtextbox MDI (Multiple Document Interface)

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CST238 Week 4

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  1. CST238 Week 4 • Questions / Concerns? • Announcements • Start thinking about project ideas • Test#1 next Monday, 4/28/14 • Recap • Check-off Take Home Lab#3 • New topics • Dialogs (user-defined dialogs) • Timer control • DateTime object • Richtextbox • MDI (Multiple Document Interface) • Parent/child form relationship • Richtextbox – open, save, cut, copy, paste • In-Class Exercise #4 • Take Home Lab#4

  2. Recap • Picturebox • Image property • Load method • Layout controls • Table • Flow layout • Menu • Toolbar • Status bar • Working with C# arrays

  3. Dialog • Forms that: • Provide information to the user, or • Request information from the user • Generally modal • Cannot switch forms until dialog is closed. • Several dialogs included with Windows Forms • MessageBox, Color, OpenFile, SaveFile, Print, etc. • You can create your own custom dialog

  4. Working with Dialogs • Simple Dialogs • Just a function call • MessageBox.Show() • Common/Custom Dialog • Create instance of dialog • Set properites • Show dialog using ShowDialog method • Returns a meber of the DialogResult enumeration • Take action based on dialog result

  5. Working with Dialog OpenFieDialog openFile1 = new OpenFileDialog(); openFile1.Filter = “JPEG Files (*.jpg)|*.jpg|PNG Files (*.png)|*.png|BMP Files (*.bmp)|*.bmp|All files (*.*)|*.*”; if (openFile1.ShowDialog() == DialogResults.OK) { //Do something with OpenFile1.FileName //which is the filename selected by the user if (openFile1.ShowDialog() == DialogResult.OK) { pictureBox1.Load(openFile1.FileName); } }

  6. Working with Color Dialog ColorDialog colorDialog1 = new ColorDialog(); if (colorDialog1.ShowDialog() == DialogResult.OK) pictureBox1.BackColor = colorDialog1.Color; //selected color

  7. Custom Dialog • Create form as you would any other • Set form properties to add dialog look, feel and behavior • Set FormBorderStyle to FixedDialog • Disables resizing of dialog • Set ControlBox property to false • Removes minimize, maximize and close buttons from title bar • Set AcceptButton and CancelButton properties • AcceptButton - pressing Enter is the same as clicking the button • CancelButton – pressing Escape is the same as clicking the button • Set dialog return value on button clicks • In event handler, or • Using the DialogResult property of the button

  8. Timer Control • Add a timer control to the form • Set its interval – 1000 ms = 1 second • Set its Tick event handler to handle the timer event at every interval

  9. DateTime • DateTime object in C# returns the current date and time. • Custom Date and Time Format Strings: http://msdn.microsoft.com/en-us/library/8kb3ddd4(v=vs.110).aspx • Example: private DateTimetimeOfDay; Private string timeString; private string hour; private string minute; timeOfDay= DateTime.Now; timeString = timeOfDay.ToString("hh:mm:ss"); hour = timeOfDay.Hour.ToString("00"); minute = timeOfDay.Minute.ToString("00");

  10. Richtextbox • Supports • Cut • Copy • Paste • SelectAll • SaveFile(filename) • LoadFile(filename) • SelectionColor • SelectionFont

  11. MDI

  12. Multiple Document Interface (MDI)

  13. MDI Apps • Main Form • Set IsMdiContainer to true • Use ActiveMdiChild to get reference to active child form • Use MdiChildren to get collection of child forms • Use LayoutMdi to arrange child forms • Child forms • Set MdiParent to main form on creation • Use MdiParent to get reference back to main form

  14. MDI • Windows menu • Arrange the windows in Cascade • Arrange the windows in Tile Horizontally • Arrange the windows in Tile Vertically • Menustrip Control • Set MdiWindowList • This will show a list of active child windows

  15. Access the Active Child form if (this.ActiveMdiChild != null) { //cast the ActiveMdiChild to the right form type ChildForm child=(ChildForm)this.ActiveMdiChild; //do something with childform’s control child.documentTextbox.Undo(); } documentTextboxis private. It needs to be internal. Change its modifier in the Properties window.

  16. private vs. internal • All controls on a form are default to private modifier. • Only available to the containing form • In order for the Main Form to access the Childform’s control, the control’s modifier would have to be changed. • internal means that they are in the same assembly (.exe or .dll)

  17. Modifiers

  18. In-Class Lab#4 • Finish the MDI application by finishing the Open, Save, Cut, Copy,Paste, Change Font and Change Color menu options. • When open a new childForm window, set its title appropriately. • Be sure to change the childForm window title to the saved/opened filename.

  19. Take-Home Exercise #4 • Build a Tix Clock • This is a Tix Clock showing 15:43.

  20. Tix Clock • Use pictureboxes to simulate color LEDs. • Use random number to randomly color squares. • Tix clocks are updated every 4 seconds. • Use DateTime to get the current time. Be sure to grab 2 digits for hour and 2 digits for minute.

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