public QuestionsScreen()
{
//instantiates the camera class for use
//to take images
cameraOps = new Camera();
//creating layouts to store each of the images within the grid
//without this the background of the grid is white when we want
//it to be black
#region imageIconLayouts
StackLayout logoLayout = new StackLayout
{
BackgroundColor = Color.Black,
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
Padding = new Thickness(4, 0, 0, 0)
};
StackLayout questionIconLayout = new StackLayout
{
BackgroundColor = Color.Black,
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
Padding = new Thickness(0, 2, 0, 0)
};
StackLayout triviaIconLayout = new StackLayout
{
BackgroundColor = Color.Black,
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
Padding = new Thickness(0, 2, 0, 0)
};
StackLayout taskIconLayout = new StackLayout
{
BackgroundColor = Color.Black,
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
Padding = new Thickness(0, 2, 0, 0)
};
StackLayout cameraIconLayout = new StackLayout
{
BackgroundColor = Color.Black,
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
Padding = new Thickness(0, 2, 0, 0)
};
#endregion
//stacklayout to host the questions editor, and scrollview
//this is necessary because without it the scrollview
//will override the grid layout and flow out of the grid
StackLayout questionContent = new StackLayout
{
Padding = new Thickness(3, 0, 4, 0),
BackgroundColor = Color.Black
};
MyEditor questions = new MyEditor
{
Text = "",
Keyboard = Keyboard.Default,
BackgroundColor = Color.Black,
};
questionTypeLabel = new Label
{
Text = "Activity Tasks",
TextColor = Color.White,
BackgroundColor = Color.Black,
FontSize = 20
};
//try load from file
loadText(questions, currentFile);
//when questions editor is unfocused save
questions.Unfocused += (sender, e) =>
{
saveText(questions, currentFile);
};
//scrollview for the question editor
ScrollView questionText = new ScrollView
{
IsClippedToBounds = true,
Content = questions
};
questionContent.Children.Add(questionTypeLabel);
questionContent.Children.Add(questionText);
//questionContent.Children.Add(scrollViewFix);
//creating each of the image icons for
//the grid with their tap commands to load
//correct file
#region imageIcons
Image logo = new Image
{
Source = "QutLogoWhite.png",
HeightRequest = (App.screenHeight / 12) - 4,
HorizontalOptions = LayoutOptions.StartAndExpand,
VerticalOptions = LayoutOptions.CenterAndExpand
};
Image cameraIcon = new Image
{
Source = "cameraIcon.png",
HeightRequest = (App.screenHeight / 12) - 4,
WidthRequest = 30
};
Image questionIcon = new Image
{
Source = "questionIcon.png",
HeightRequest = (App.screenHeight / 12) - 4,
WidthRequest = 30
};
Image triviaIcon = new Image
{
Source = "triviaIcon.png",
BackgroundColor = Color.Black,
HeightRequest = (App.screenHeight / 12) - 4,
WidthRequest = 30
};
Image taskIcon = new Image
{
Source = "taskIcon.png",
HeightRequest = (App.screenHeight / 12) - 4,
WidthRequest = 30
};
questionIcon.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(() => loadText(questions, "activity" + App.currentActivity + "Questions.txt"))
});
triviaIcon.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(() => loadText(questions, "activity" + App.currentActivity + "Trivia.txt"))
});
taskIcon.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(() => loadText(questions, "activity" + App.currentActivity + "Tasks.txt")),
});
cameraIcon.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(() => takePicture()),
});
#endregion
//adding each of the image icons to the relevant layout
questionIconLayout.Children.Add(questionIcon);
triviaIconLayout.Children.Add(triviaIcon);
taskIconLayout.Children.Add(taskIcon);
cameraIconLayout.Children.Add(cameraIcon);
logoLayout.Children.Add(logo);
//creating a new 5x8 grid
Grid pageGrid = new Grid
{
VerticalOptions = LayoutOptions.CenterAndExpand,
HorizontalOptions = LayoutOptions.CenterAndExpand,
BackgroundColor = Color.White,
Opacity = 0.8,
//row and column spacing creates a "bordered"
//effect around each element
RowSpacing = 2,
ColumnSpacing = 2,
IsClippedToBounds = true,
Padding = new Thickness(.5, 1, .5, 0),
//all row heights, and column widths are relative to
//the devices screen size/resolution so they should
//be an appropriate size on each type of device
RowDefinitions = {
new RowDefinition {Height = 0},
new RowDefinition {Height = App.screenHeight / 12},
new RowDefinition {Height = App.screenHeight / 1.35},
new RowDefinition {Height = App.screenHeight / 12},
new RowDefinition {Height = 0}
},
ColumnDefinitions =
{
new ColumnDefinition {Width = 0},
new ColumnDefinition {Width = App.screenWidth / 10},
new ColumnDefinition {Width = App.screenWidth / 5 - 32},
new ColumnDefinition {Width = App.screenWidth / 5},
new ColumnDefinition {Width = App.screenWidth / 5},
new ColumnDefinition {Width = App.screenWidth / 5},
new ColumnDefinition {Width = App.screenWidth / 10},
new ColumnDefinition {Width = 0}
}
};
Label backLbl = new Label
{
Text = "<",
BackgroundColor = Color.Black,
TextColor = Color.White,
FontSize = 24,
XAlign = TextAlignment.Center,
YAlign = TextAlignment.Center
};
backLbl.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(() => goBack())
});
Label nextLbl = new Label
{
Text = ">",
BackgroundColor = Color.Black,
TextColor = Color.White,
FontSize = 24,
XAlign = TextAlignment.Center,
YAlign = TextAlignment.Center
};
nextLbl.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(() => goToNextActivity()),
});
//adding each element to the grid
pageGrid.Children.Add(backLbl, 1, 1); //back button
pageGrid.Children.Add(logoLayout, 2, 7, 1, 2); //qut logo
pageGrid.Children.Add(questionContent, 1, 7, 2, 3); //scrolling editor text
pageGrid.Children.Add(questionIconLayout, 1, 3, 3, 4); //questions button
pageGrid.Children.Add(triviaIconLayout, 3, 3); //trivia button
pageGrid.Children.Add(taskIconLayout, 4, 3); //tasks button
pageGrid.Children.Add(cameraIconLayout, 5, 3); //camera button
pageGrid.Children.Add(nextLbl, 6, 3); //next activity button
//creating a stacklayout and adding the grid to it
StackLayout innerContent = new StackLayout
{
HorizontalOptions = LayoutOptions.Center,
VerticalOptions = LayoutOptions.Center,
};
innerContent.Children.Add(pageGrid);
//making the pages content the stacklayout with the grid
this.Content = innerContent;
//add padding to account for the iOS status bar
this.Padding = new Thickness(0, Device.OnPlatform(20, 0, 0), 0, 0);
this.BackgroundImage = "background.png";
//when the editor with the questions is unfocused
//invalidate it so that it reformats the height
questions.TextChanged += (s, e) =>
{
reformatEditorHeight(questions);
};
//on iOS when you click the text in the editor, it doesn't
//automatically scroll the editor down to where the text is
//with this added functionality when the question editor is
//focused it should scroll to the position the user clicked
//and when unfocused scroll back to the beginning of the
//editor element.
if (Device.OS == TargetPlatform.iOS)
{
questions.Focused += (s, e) =>
{
double scrollPosition = questions.Y;
questionText.ScrollToAsync(0, scrollPosition, false);
};
questions.Unfocused += (s, e) =>
{
questionText.ScrollToAsync(0, 0, false);
};
}
}
/*
* function to reformat the question editors
* height when text is entered that would
* exceed the current editor height
* i.e. makes the editor height grow dynamically
*/
private void reformatEditorHeight(MyEditor questionElement)
{
questionElement.InvalidateLayout();
}