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

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

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

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

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); }

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

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

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

DateTime DateTime object in C# returns the current date and time. Custom Date and Time Format Strings: Example: private DateTime timeOfDay; 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");

Richtextbox Supports – Cut – Copy – Paste – SelectAll – SaveFile(filename) – LoadFile(filename) – SelectionColor – SelectionFont

MDI

Multiple Document Interface (MDI)

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

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

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(); } documentTextbox is private. It needs to be internal. Change its modifier in the Properties window.

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)

Modifiers

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.

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

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.