/// <summary>
/// Handles the <see cref="ButtonBase.Click"/> event for the "Browse…" <see cref="Button"/>.
/// </summary>
/// <param name="sender">
/// The <see cref="Object"/> where the event handler is attached.</param>
/// <param name="args">
/// A <see cref="RoutedEventArgs"/> object containing event data.</param>
/// <remarks>
/// <b>OnPathBrowse</b> shows an <see cref="FileDialogs.OpenImageDialog"/> allowing the user
/// to select a new <see cref="OverlayImage.Path"/>, and sets the <see cref="DataChanged"/>
/// flag if the user selects a valid new file path.</remarks>
private void OnPathBrowse(object sender, RoutedEventArgs args)
{
args.Handled = true;
// ask user to enter an existing image
RootedPath path = FileDialogs.OpenImageDialog(this._overlay.Path);
// quit if user cancelled, or entered old or invalid path
if (path == null || path.IsEmpty || path.Equals(this._overlay.Path) ||
!File.Exists(path.AbsolutePath))
{
return;
}
// disable dialog while image loads
IsEnabled = false;
Dispatcher.DoEvents();
// try loading overlay image
this._overlay.Path = path.AbsolutePath;
if (!AreasTabContent.MapView.ShowOverlay(this, this._editing))
{
path.Clear();
}
// broadcast data changes
ShowImagePath();
ShowImageSize();
DataChanged = true;
IsEnabled = true; // reenable dialog
}
/// <summary>
/// Shows an <see cref="SaveFileDialog"/> allowing the user to enter or select a file to
/// save.</summary>
/// <param name="title">
/// The title bar text for the <see cref="SaveFileDialog"/>.</param>
/// <param name="filter">
/// The file type filter for displayed files.</param>
/// <param name="index">
/// The index of the initially selected file type filter.</param>
/// <param name="extension">
/// The default extension for files entered by the user.</param>
/// <param name="path">
/// A <see cref="RootedPath"/> wrapping the absolute file path initially selected in the
/// dialog.</param>
/// <param name="directory">
/// The directory initially shown in the dialog if <paramref name="path"/> is empty.</param>
/// <returns>
/// A <see cref="RootedPath"/> wrapping the absolute file path selected by the user, or an
/// empty path if the user cancelled the dialog.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="path"/> is a null reference.</exception>
/// <remarks>
/// The specified <paramref name="path"/> may be empty to indicate that no file should be
/// initially selected. In this case, the dialog initially shows the specified <paramref
/// name="directory"/>, which is otherwise ignored.</remarks>
private static RootedPath SaveDialog(string title, string filter,
int index, string extension, RootedPath path, string directory)
{
if (path == null)
{
ThrowHelper.ThrowArgumentNullException("path");
}
SaveFileDialog dialog = new SaveFileDialog();
dialog.DefaultExt = extension;
dialog.Filter = filter;
dialog.FilterIndex = index;
dialog.InitialDirectory = directory ?? "";
dialog.RestoreDirectory = true;
dialog.Title = title;
dialog.ValidateNames = true;
// pre-select specified file path, if any
if (!path.IsEmpty)
{
dialog.InitialDirectory = path.DirectoryName;
dialog.FileName = path.FileName;
}
// allow creation of new files
dialog.CheckFileExists = false;
dialog.CheckPathExists = false;
// return empty path if user cancels
var owner = System.Windows.Application.Current.MainWindow;
if (dialog.ShowDialog(owner) != true)
{
return(path.Clear());
}
// return selected file path
return(path.Change(dialog.FileName));
}
