/// <summary>
/// Sets the contrast scheme to the given value.
/// </summary>
/// <param name="contrastScheme">The contrast scheme to use.</param>
public override void SetContrast(ContrastLevel contrastScheme)
{
try
{
HtmlPage.Window.CreateInstance("SetContrastClass", contrastScheme.ToString());
}
catch(Exception)
{
}
}
/// <summary>
/// Changes the contrast level of the surface. Typically this is a matter of
/// changing the background and foreground colours. This could be acheived by
/// setting CSS classes on the DivContainer.
/// </summary>
/// <param name="contrast">The contrast level to set on the surface.</param>
public override void SetContrast(ContrastLevel level)
{
Container.CssClass = level.ToString();
}
/// <summary>
/// Constructor for the ContrastSchemeEventArgs, this EventArgs will be used to pass
/// the contrast scheme.
/// </summary>
/// <param name="contrastScheme"></param>
public ContrastSchemeEventArgs(ContrastLevel contrastScheme)
{
ContrastScheme = contrastScheme;
}
// Public Methods (9)
/// <summary>
/// Applies the contrast setting to the entire interface.
/// </summary>
/// <param name="contrastScheme">The contrast scheme.</param>
public void ApplyContrastSetting(ContrastLevel contrastScheme)
{
_displayAttributes.HighlightBackground = DisplayAttributes.YellowBrush;
_displayAttributes.HighlightForeground = DisplayAttributes.BlackBrush;
switch(contrastScheme)
{
case ContrastLevel.WhiteTextOnBlue:
{
_displayAttributes.DefaultBackground = DisplayAttributes.DarkBlueBrush;
_displayAttributes.DefaultForeground = DisplayAttributes.LightWhiteBrush;
_displayAttributes.ControlSectionBackground = DisplayAttributes.DarkBlueBrush;
_displayAttributes.SelectionBackground = DisplayAttributes.YellowBrush;
_displayAttributes.SelectionBorderBrush = DisplayAttributes.YellowBrush;
_displayAttributes.SelectionForeground = DisplayAttributes.BlackBrush;
break;
}
case ContrastLevel.BlackTextOnWhite:
{
_displayAttributes.DefaultBackground = DisplayAttributes.LightWhiteBrush;
_displayAttributes.DefaultForeground = DisplayAttributes.BlackBrush;
_displayAttributes.ControlSectionBackground = DisplayAttributes.LightWhiteBrush;
_displayAttributes.SelectionBackground = DisplayAttributes.BlackBrush;
_displayAttributes.SelectionBorderBrush = DisplayAttributes.YellowBrush;
_displayAttributes.SelectionForeground = DisplayAttributes.YellowBrush;
break;
}
case ContrastLevel.YellowTextOnBlack:
{
_displayAttributes.DefaultBackground = DisplayAttributes.BlackBrush;
_displayAttributes.DefaultForeground = DisplayAttributes.YellowBrush;
_displayAttributes.ControlSectionBackground = DisplayAttributes.BlackBrush;
_displayAttributes.SelectionBackground = DisplayAttributes.YellowBrush;
_displayAttributes.SelectionBorderBrush = DisplayAttributes.LightWhiteBrush;
_displayAttributes.SelectionForeground = DisplayAttributes.BlackBrush;
break;
}
}
DisplaySurface.SetContrast(contrastScheme);
navigation.RefreshContrast();
}
/// <summary>
/// Applies the given contrast scheme to the UI.
/// </summary>
/// <param name="contrastScheme">The contrast scheme to be applied.</param>
private void ApplyContrastScheme(ContrastLevel contrastScheme)
{
View.ApplyContrastSetting(contrastScheme);
}
// Public Methods (2)
/// <summary>
/// Updates the reported contrast scheme in the display settings. Called by the Presenter.
/// </summary>
/// <param name="contrastScheme">The contrast scheme.</param>
public void UpdateContrastScheme(ContrastLevel contrastScheme)
{
ListBoxItem selectedItem = (ListBoxItem)contrastSchemeSelector.Items.FirstOrDefault(
currentItem => ((ListBoxItem)currentItem).Tag.ToString() == contrastScheme.ToString());
//Don't want the event to fire to re-update this in the Model.
contrastSchemeSelector.SelectionChanged -= contrastSchemeSelectionChanged;
if(selectedItem != null)
{
contrastSchemeSelector.SelectedItem = selectedItem;
}
contrastSchemeSelector.SelectionChanged += contrastSchemeSelectionChanged;
}
