197 lines
7.5 KiB
C#
197 lines
7.5 KiB
C#
/* Simple text editor with a main text box and a toolbar on top:
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+vbox----------------------------------------+
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| +hbox------------------------------------+ |
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| | +btn-+ +btn-+ +btn-+ +box-----+ +btn-+ | |
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| | |NEW | |SAVE| |LOAD| | spacer | |QUIT| | |
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| | +----+ +----+ +----+ +--------+ +----+ | |
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| +----------------------------------------+ |
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| +text------------------------------------+ |
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| | Main text box | |
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| +----------------------------------------+ |
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+--------------------------------------------+
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*/
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using System;
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public class TextEditor : Efl.Csharp.Application
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{
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private Efl.Ui.Win win; // The main window
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private Efl.Ui.Text editorTextBox; // The main text entry
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private Efl.Ui.Button toolbarButtonNew; // The "New" button in the toolbar
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private Efl.Ui.Button toolbarButtonSave; // The "Save" button in the toolbar
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private Efl.Ui.Button toolbarButtonLoad; // The "Load" button in the toolbar
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private bool edited = false; // Document was edited since last save
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// File to load and save is fixed since we do not use a file selection dialog
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private readonly string filename = System.IO.Path.Combine(System.IO.Path.GetTempPath(),
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"texteditor_example.txt");
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// Quits the application
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private void GUIQuitCb(object sender, Efl.Gfx.IEntityVisibilityChangedEvt_Args ea)
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{
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if (ea.arg == false)
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Efl.App.AppMain.Quit(0);
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}
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// Enables or disables buttons on the toolbar as required
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private void GUIToolbarRefresh()
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{
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// "New" is enabled if there is text in the text box
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toolbarButtonNew.SetDisabled(string.IsNullOrEmpty(editorTextBox.GetText()));
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// "Save" is enabled if the text has been modified since last save or load
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toolbarButtonSave.SetDisabled(!edited);
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// "Load" is enabled if there is a file to load
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toolbarButtonLoad.SetDisabled(!System.IO.File.Exists(filename));
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}
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// Called when the text in the editor has changed
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private void EditorChangedCb(object sender, EventArgs ea)
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{
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edited = true;
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GUIToolbarRefresh();
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}
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// Shows a modal message popup with an "OK" button
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private void ShowMessage(string message)
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{
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var popup = new Efl.Ui.TextAlertPopup (win);
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popup.SetText(message);
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popup.SetExpandable(new Eina.Size2D(200, 200));
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popup.SetButton(Efl.Ui.AlertPopupButton.Positive, "OK", null);
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popup.ButtonClickedEvt +=
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(object sender, Efl.Ui.AlertPopupButtonClickedEvt_Args ea) => {
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// Dismiss popup when the button is clicked
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((Efl.Ui.TextAlertPopup)sender).SetParent(null);
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};
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}
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// Adds a button to the toolbar, with the given text, icon and click event handler
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private Efl.Ui.Button GUIToolbarButtonAdd(Efl.Ui.Box toolbar, string name,
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string iconName, EventHandler<Efl.Ui.IClickableClickedEvt_Args> func)
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{
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var button = new Efl.Ui.Button(toolbar);
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button.SetText(name);
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button.ClickedEvt += func;
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button.SetHintWeight(0, 1);
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// Set the content of the button, which is an image
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var image = new Efl.Ui.Image(toolbar);
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image.SetIcon(iconName);
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button.SetContent(image);
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toolbar.Pack(button);
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return button;
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}
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// Creates a new toolbar, with all its buttons
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private void GUIToolbarSetup(Efl.Ui.Box parent)
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{
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// Create a horizontal box container for the buttons
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var bar = new Efl.Ui.Box(parent);
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// 0 vertical weight means that the toolbar will have the minimum height
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// to accommodate all its buttons and not a pixel more. The rest of the
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// space will be given to the other object in the parent container.
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bar.SetHintWeight(1, 0);
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bar.SetOrientation(Efl.Ui.LayoutOrientation.Horizontal);
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parent.Pack(bar);
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// "New" button
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toolbarButtonNew = GUIToolbarButtonAdd(bar, "New", "document-new",
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(object sender, Efl.Ui.IClickableClickedEvt_Args ea) => {
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// When this button is clicked, remove content and refresh toolbar
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editorTextBox.SetText("");
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GUIToolbarRefresh();
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});
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// "Save" button
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toolbarButtonSave = GUIToolbarButtonAdd(bar, "Save", "document-save",
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(object sender, Efl.Ui.IClickableClickedEvt_Args ea) => {
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// When this button is clicked, try to save content and refresh toolbar
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try {
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System.IO.File.WriteAllText(filename, editorTextBox.GetText());
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edited = false;
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GUIToolbarRefresh();
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ShowMessage("Saved!");
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} catch (Exception e) {
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// If something fails, show the error message
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ShowMessage(e.Message);
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}
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});
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// "Load" button
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toolbarButtonLoad = GUIToolbarButtonAdd(bar, "Load", "document-open",
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(object sender, Efl.Ui.IClickableClickedEvt_Args ea) => {
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// When this button is clicked, try to load content and refresh toolbar
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try {
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editorTextBox.SetText(System.IO.File.ReadAllText(filename));
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edited = false;
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GUIToolbarRefresh();
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ShowMessage("Loaded!");
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} catch (Exception e) {
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// If something fails, show the error message
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ShowMessage(e.Message);
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}
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});
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// Spacer box to use all available space not required by buttons
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// (It has a default horizontal weight of 1, whereas all buttons have
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// a horizontal weight of 0).
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// As a result, it pushes the "Quit" button to the right margin and
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// the rest to the left.
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Efl.Ui.Box box = new Efl.Ui.Box(parent);
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bar.Pack(box);
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// "Quit" button
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GUIToolbarButtonAdd(bar, "Quit", "application-exit", (object sender, Efl.Ui.IClickableClickedEvt_Args e) => { Efl.Ui.Config.Exit(); } );
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}
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// Builds the user interface for the text editor
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protected override void OnInitialize(string[] args)
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{
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// Create a window and initialize it
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win = new Efl.Ui.Win(parent: Efl.App.AppMain);
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win.SetText("Text Editor");
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win.SetAutohide(true);
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win.VisibilityChangedEvt += GUIQuitCb;
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// Create a vertical box container
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Efl.Ui.Box box = new Efl.Ui.Box(win);
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win.SetContent(box);
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// Create the toolbar and add it to the box
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GUIToolbarSetup(box);
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// Create the main text entry
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editorTextBox = new Efl.Ui.Text(box);
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editorTextBox.SetFont("Mono", 14);
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editorTextBox.Multiline = true;
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editorTextBox.Editable = true;
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editorTextBox.Scrollable = true;
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editorTextBox.SetHintSizeMin(new Eina.Size2D(360, 240));
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editorTextBox.ChangedEvt += EditorChangedCb;
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editorTextBox.ChangedUserEvt += EditorChangedCb;
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box.Pack(editorTextBox);
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// Initial refresh of the toolbar buttons
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GUIToolbarRefresh();
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}
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}
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public class Example
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{
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#if WIN32
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[STAThreadAttribute()]
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#endif
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public static void Main()
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{
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TextEditor editor = new TextEditor();
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editor.Launch();
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}
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}
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