Īlso I still would like to see a sample of how to change the BackGround or Border colors in code. Public object ConvertBack(object value, Type targetType,ĭouble.Use the following to reproduce the error (Uncomment the style will produce the error). Return dValue.ToString("F0") // F1 is one decimal place and so on. convert from double to a string with no decimal places Public object Convert(object value, Type targetType, Public class DisplayTwoDecPlaces : IValueConverter You must specify the ValueConversion attribute in square brackets Private void sliderBlue_ValueChanged(object sender, RoutedPropert圜hangedEventArgs e)īelow is the Two Way Converter class: DisplayTwoDecPlaces.cs Private void sliderGreen_ValueChanged(object sender, RoutedPropert圜hangedEventArgs e) Private void sliderRed_ValueChanged(object sender, RoutedPropert圜hangedEventArgs e) Rect.Fill = new SolidColorBrush(Color.FromRgb(redByteValue, greenByteValue, blueByteValue)) to bytes and store in variables of type byte.īyte.TryParse((string)redStringValue, out redByteValue) īyte.TryParse((string)greenStringValue, out greenByteValue) īyte.TryParse((string)blueStringValue, out blueByteValue) get the values in the text boxes as strings and then convert String redStringValue, greenStringValue, blueStringValue īyte redByteValue, greenByteValue, blueByteValue / Interaction logic for MainWindow.xaml The sliders can change the text boxes and the rectangle’s colour.īelow is the code behind:.When the value changes, we call a function that adjusts the colour in the rectangle by reading values in the three text boxes and assigning them to the Color struct of the SolidColorBrush object used to Fill the rectangle. We use the ValueChanged event of the three sliders. We also need to bind the text boxes to the rectangle to display the appropriate colour. We can use a previous post on Value Converters to help with setting binding the text boxes to their sliders and not allowing any decimal places. For example, go to the site for their color picker. There are lots of colour viewers/pickers on the Internet that have many more features than this one. If the user enters a number greater than 255, and the text box loses its focus, the text box automatically adjusts to 255. If they do enter non-numeric characters and the text box loses its focus, the text box automatically adjusts to zero. You also want to prevent the user from entering invalid data such as alphabetical characters. The number range for each slider is zero to 255 and contains no fractions. When the slider is adjusted by the user, the corresponding RGB number adjusts and the rectangle’s colour adjusts. The user can press the Tab key to change the focus. However the text boxes do not update the slider until the text box loses its focus. Also, they can enter the three numbers directly into text boxes. The user is presented with three sliders that they can use to set the RGB colour numbers and view a rectangle showing the colour represented by the RGB numbers they have chosen. Here is an example of a partially complete, small Windows project that incorporates some of the WPF concepts presented in previous posts. It does the same thing but looks a bit different because the layout is different and a couple of things were changed in the code and a link to this website was added. We have an update to this program here at over at WPF RGB Color Viewer.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |