// updateScreen method
// Standardized update routine to write the form depending on the current state.
// It sets form controls and properties redundantly for the sake of simplicity.
// There's no noticeable performance penalty from doing so.
private void updateScreen()
{
// set the form caption from the application name "Cyryx Self Study" and the course name
// courseName is a private property of Slide
Text = appName + " - " + course.Name;
// make the session panel visible if in session view
sessions.Visible = course.View == View.sessions;
// session view
if (sessions.Visible)
{
// disable callbacks for session view so they're not triggered when set here
rename.TextChanged -= rename_TextChanged;
listBox.SelectedIndexChanged -= listBox1_SelectedIndexChanged;
// set the text box for renaming a session
rename.Text = course.CurrentSession.Title;
// set the list box that lists sessions in session view
listBox.Items.Clear();
listBox.Items.AddRange(course.SessionItems);
listBox.SelectedIndex = course.Session;
// re-enable the calbacks
rename.TextChanged += rename_TextChanged;
listBox.SelectedIndexChanged += listBox1_SelectedIndexChanged;
}
else // slide or student view
// set the title of the current session
// session numbering is added automatically
{
title.Text = ((1 + course.Session).ToString()) + ". " + course.CurrentSession.Title;
// set the "Slide n of p" message
slideNumber.Text = course.SlideNumber;
// set the screen image
picture.Image = course.CurrentScreen.Image;
// set the screen text
text.Rtf = course.CurrentScreen.Text;
// change the text cursor to arrow when in student view
text.Cursor = (course.View == View.student) ? Cursors.Arrow : Cursors.IBeam;
// the question panel is visible only if this screen is a question
// make text read only in student view
text.ReadOnly = course.View == View.student;
questions.Visible = course.CurrentScreen.Question;
// set up the question's answer panel if this is a question screen
// the question itself is given in the text field
if (questions.Visible)
{
// set the answer text
answer1.Text = course.CurrentScreen.Answer(1);
answer2.Text = course.CurrentScreen.Answer(2);
answer3.Text = course.CurrentScreen.Answer(3);
answer4.Text = course.CurrentScreen.Answer(4);
// set the cursor to arrow for student view
answer1.Cursor = (course.View == View.student) ? Cursors.Arrow : Cursors.IBeam;
answer2.Cursor = (course.View == View.student) ? Cursors.Arrow : Cursors.IBeam;
answer3.Cursor = (course.View == View.student) ? Cursors.Arrow : Cursors.IBeam;
answer4.Cursor = (course.View == View.student) ? Cursors.Arrow : Cursors.IBeam;
// reset normal background color which changes for correct/incorrect answers
answer1.BackColor = text.BackColor;
answer2.BackColor = text.BackColor;
answer3.BackColor = text.BackColor;
answer4.BackColor = text.BackColor;
// disable radio button callbacks so they're not triggered when setting them here
radioButton1.CheckedChanged -= radioButton1_CheckedChanged;
radioButton2.CheckedChanged -= radioButton2_CheckedChanged;
radioButton3.CheckedChanged -= radioButton3_CheckedChanged;
radioButton4.CheckedChanged -= radioButton4_CheckedChanged;
// set all radio buttons to false initially
radioButton1.Checked = false;
radioButton2.Checked = false;
radioButton3.Checked = false;
radioButton4.Checked = false;
// set answer text to read only in student view
answer1.ReadOnly = course.View == View.student;
answer2.ReadOnly = course.View == View.student;
answer3.ReadOnly = course.View == View.student;
answer4.ReadOnly = course.View == View.student;
// set choice to correct choice if not in instructor view
if (course.View != View.student)
{
choice = course.CurrentScreen.Correct;
}
// set radio button and answer text background color depending on choice
RadioButton rb = null;
TextBox tb = null;
// get the radio button and answer control for the choice
switch (choice)
{
case 1: rb = radioButton1; tb = answer1; break;
case 2: rb = radioButton2; tb = answer2; break;
case 3: rb = radioButton3; tb = answer3; break;
case 4: rb = radioButton4; tb = answer4; break;
}
if (rb != null) // if there is a valid choice
{
rb.Checked = true; // set checked to true
// if in authoring (slide) view, green background indicates correct choice
if (course.View != View.student)
{
tb.BackColor = Color.LightGreen;
}
else // in student view, background and sound depend on whether selection is correct or not
if (course.CurrentScreen.Correct != choice)
{
tb.BackColor = Color.LightPink;
course.GBSound(false);
}
else
{
tb.BackColor = Color.LightGreen;
course.GBSound(true);
}
}
// re-enable radio button callbacks
radioButton1.CheckedChanged += radioButton1_CheckedChanged;
radioButton2.CheckedChanged += radioButton2_CheckedChanged;
radioButton3.CheckedChanged += radioButton3_CheckedChanged;
radioButton4.CheckedChanged += radioButton4_CheckedChanged;
}
// enable context menus only in slide view
contextMenuStrip1.Enabled = course.View == View.slide;
contextMenuStrip2.Enabled = course.View == View.slide;
// initialized text and answer modified states to false, to detect when they change
text.Modified = false;
answer1.Modified = false;
answer2.Modified = false;
answer3.Modified = false;
answer4.Modified = false;
}
// make the question toggle button visible only in slide view
questionsShow.Visible = course.View == View.slide;
// disable callback for button to toggle question panel on and off
questionsShow.CheckedChanged -= checkBox1_CheckedChanged;
// set the toggle
questionsShow.Checked = questions.Visible;
// re-enable the callback
questionsShow.CheckedChanged += checkBox1_CheckedChanged;
// turn "Student View" label on or off
StudentView.Visible = course.View == View.student;
// set menu checked states for the 3 different views
toolStripMenuItemSessions.CheckState =
(course.View == View.sessions) ? CheckState.Checked : CheckState.Unchecked;
toolStripMenuItemSlides.CheckState =
(course.View == View.slide) ? CheckState.Checked : CheckState.Unchecked;
toolStripMenuItemStudent.CheckState =
(course.View == View.student) ? CheckState.Checked : CheckState.Unchecked;
// enable or disable undo and redo depending on the undo state
undoToolStripMenuItem.Enabled = course.UnDoCtr > -1;
redoToolStripMenuItem.Enabled = course.UnDoPos <= course.UnDoCtr;
// enable or disable session menu items depending on view
cutToolStripMenuItem.Enabled = course.View == View.slide;
copyToolStripMenuItem.Enabled = course.View == View.slide;
pasteToolStripMenuItem.Enabled = course.View == View.slide;
insertToolStripMenuItem.Enabled = course.View == View.slide;
// "Sound" menu item is enabled if there is a sound available for this screen
// clicking it plays the sound clip, which normally doesn't play automatically
soundToolStripMenuItem.Enabled =
course.CurrentScreen.SoundFile != "" &&
course.CurrentScreen.SoundFile != null;
// make the panel at the bottom of the screen (with Back and Next buttons) invisible in session view
panel1.Visible = course.View != View.sessions;
// when the screen changes...
if (course.Directory != courseDirectory ||
course.Session != session ||
course.Screen != screen ||
course.View != view)
{
choice = -1; // set the question response to invalid
course.Sound(); // play the sound clip for this screen
// save the navigation state so we can detect screen change next time
courseDirectory = course.Directory;
session = course.Session;
screen = course.Screen;
view = course.View;
// set initial focus to the Next button
nextButton.Focus();
}
}
