TweetDuck/Dialogs/Settings/DialogSettingsCSS.cs

using System;
using System.Linq;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using TweetDuck.Controls;

namespace TweetDuck.Dialogs.Settings {
	sealed partial class DialogSettingsCSS : Form {
		public string BrowserCSS => textBoxBrowserCSS.Text;
		public string NotificationCSS => textBoxNotificationCSS.Text;

		private readonly Action<string> reinjectBrowserCSS;
		private readonly Action openDevTools;

		public DialogSettingsCSS(string browserCSS, string notificationCSS, Action<string> reinjectBrowserCSS, Action openDevTools) {
			InitializeComponent();

			Text = Program.BrandName + " Options - CSS";

			this.reinjectBrowserCSS = reinjectBrowserCSS;
			this.openDevTools = openDevTools;

			textBoxBrowserCSS.EnableMultilineShortcuts();
			textBoxBrowserCSS.Text = browserCSS ?? "";

			textBoxNotificationCSS.EnableMultilineShortcuts();
			textBoxNotificationCSS.Text = notificationCSS ?? "";

			ActiveControl = textBoxBrowserCSS;
			textBoxBrowserCSS.Select(textBoxBrowserCSS.TextLength, 0);
		}

		private void tabPanel_SelectedIndexChanged(object sender, EventArgs e) {
			TextBox tb = tabPanel.SelectedTab.Controls.OfType<TextBox>().FirstOrDefault();

			if (tb != null) {
				tb.Focus();
				tb.Select(tb.TextLength, 0);
			}
		}

		private void textBoxCSS_KeyDown(object sender, KeyEventArgs e) {
			TextBox tb = (TextBox) sender;
			string text = tb.Text;

			if (e.KeyCode == Keys.Back && e.Modifiers == Keys.Control) {
				e.SuppressKeyPress = true;

				int deleteTo = tb.SelectionStart;

				if (deleteTo > 0) {
					char initialChar = text[--deleteTo];
					bool shouldDeleteAlphanumeric = char.IsLetterOrDigit(initialChar);

					while (--deleteTo >= 0) {
						if ((shouldDeleteAlphanumeric && !char.IsLetterOrDigit(text[deleteTo])) ||
						    (!shouldDeleteAlphanumeric && text[deleteTo] != initialChar)) {
							break;
						}
					}

					if (!(deleteTo < text.Length - 1 && text[deleteTo] == '\r' && text[deleteTo + 1] == '\n')) {
						++deleteTo;
					}

					tb.Select(deleteTo, tb.SelectionLength + tb.SelectionStart - deleteTo);
					tb.SelectedText = string.Empty;
				}
			}
			else if (e.KeyCode == Keys.Back && e.Modifiers == Keys.None) {
				int deleteTo = tb.SelectionStart;

				if (deleteTo > 1 && text[deleteTo - 1] == ' ' && text[deleteTo - 2] == ' ') {
					e.SuppressKeyPress = true;

					tb.Select(deleteTo - 2, 2);
					tb.SelectedText = string.Empty;
				}
			}
			else if (e.KeyCode == Keys.Enter && e.Modifiers == Keys.None && tb.SelectionLength == 0) {
				int insertAt = tb.SelectionStart, cursorOffset = 0;
				string insertText;

				if (insertAt == 0) {
					return;
				}
				else if (text[insertAt - 1] == '{') {
					insertText = Environment.NewLine + "  ";

					int nextBracket = insertAt < text.Length ? text.IndexOfAny(new char[] { '{', '}' }, insertAt + 1) : -1;

					if (nextBracket == -1 || text[nextBracket] == '{') {
						string insertExtra = Environment.NewLine + "}";
						insertText += insertExtra;
						cursorOffset -= insertExtra.Length;
					}
				}
				else {
					int lineStart = text.LastIndexOf('\n', tb.SelectionStart - 1);

					Match match = Regex.Match(text.Substring(lineStart == -1 ? 0 : lineStart + 1), "^([ \t]+)");
					insertText = match.Success ? Environment.NewLine + match.Groups[1].Value : null;
				}

				if (!string.IsNullOrEmpty(insertText)) {
					e.SuppressKeyPress = true;
					tb.Text = text.Insert(insertAt, insertText);
					tb.SelectionStart = insertAt + cursorOffset + insertText.Length;
				}
			}
		}

		private void textBoxBrowserCSS_KeyUp(object sender, KeyEventArgs e) {
			timerTestBrowser.Stop();
			timerTestBrowser.Start();
		}

		private void timerTestBrowser_Tick(object sender, EventArgs e) {
			reinjectBrowserCSS(textBoxBrowserCSS.Text);
			timerTestBrowser.Stop();
		}

		private void btnOpenDevTools_Click(object sender, EventArgs e) {
			openDevTools();
		}

		private void btnApply_Click(object sender, EventArgs e) {
			DialogResult = DialogResult.OK;
			Close();
		}

		private void btnCancel_Click(object sender, EventArgs e) {
			DialogResult = DialogResult.Cancel;
			Close();
		}
	}
}