This article introduces how to use Visual C# 2015 to design a Windows application — notepad. Learn more about MenuStrip (menus), ToolStrip (toolbars), RichTextBox (advanced text boxes), and StatusStrip (status bar controls). And how to use CommonDialog to access and format text. (Note: all code must be used in English!) 1.1 Introduction to Notepad Notepad is a common software. Microsoft Windows provides a Notepad. Figure 1 shows the Notepad in Windows 10.
Control Type Control Name Property Setting Result Form Form1, Name frmNotepad, Text Notepad, StartPosition CenterScreen, After creating the “Notepad” project, locate it in the Form designer window of Notepad program, and then place the following controls (one for each) on the form: (1) MenuStrip (menu control). Click on the left side of the form to appear toolbox → find menuStrip → drag to form
(3) Click and input [File (F)], [Edit (E)], [format (O)], [View (V)] and [Help (H)] as shown in the figure
(3) RichTextBox (multi-format text box control). Click on the left side of the form and the toolbox will appear → find “RichTextBox” → drag to the form and click the toolbar → properties in the lower right corner → modify the Name property to “rtxtNotepad” as shown in the figure
(4) StatusStrip (status bar control) Add the StatusStrip control, set its Name property to “stsNotepad”, Dock property to “Bottom” and Anchor property to “Bottom, Left, Right”. Then click the button on the right to open the item Set Editor dialog box, as shown in the figure.
(6) Save dialog When the user clicks the “File → save” (or “Save as”) menu item of Notepad, use the save dialog box SaveFileDialog to save the file. SaveFileDialog controls the Name attribute of the “sdlgNotepad”, FileName attribute to “no title”, the Filter attribute set to “RTF file | *. The RTF”.
(7) FontDialog When the user clicks the [format] → [font] menu item of notepad, use the FontDialog box FontDialog to set the text font. The Name property of the FontDialog control is “fdlgNotepad”.
(8) Timer control. The Notepad described in this chapter displays the clock in the status bar, using a Timer control to do this. Set the Name attribute of the Timer control to “tmrNotepad”, the Enabled attribute to “True”, and the Interval attribute to “1000”, indicating that the Tick event is triggered once every second, that is, the clock is changed once every second. The final setting interface is as shown in the figure below. The user interface design is completed. Next, the specific implementation process and the preparation of source code are introduced.
- [File (F)] menu
[File (F)] The function of the menu is to complete the function of creating, opening, saving and saving files, and exit the Notepad program. The source code of each menu item is described in detail below.
(1) [New (N)] Menu item When you click this menu item to create a blank document, you should first determine whether the file is opened from disk or new. If the file is opened from disk, set the variable (b) previously defined to “true”, otherwise set it to “false”. Doing so allows you to do something to the file based on this variable. And each time the file is saved, set the previously defined variable (s) to “true”, indicating that the file has been saved. When you click the New menu, if the current file is opened from disk and has been modified, save the file in the path of the OpenFileDialog control. If it is a new file and the content is not empty, you need to use the SaveFileDialog control to save the file. The code of the [New (N)] menu item is as follows: Double-click “New” to enter the code area and fill in the following code
/ / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / [new] menu code //************************************************************************* private void tsmiNew_Click(object sender, EventArgs e)
{// Determine whether the current file is opened from disk, or whether the new document is not empty and the file is not saved
if (b == true || rtxtNotepad.Text.Trim() ! If (s == false) {string result; Result = messagebox.show (" file not saved, save?") , "save file", MessageBoxButtons YesNoCancel). The ToString (); switch (result) { case "Yes": If (b == true) {rtxtNotepad.savefile (odlgNotepad.filename); } else if (sdlgNotepad.showdialog () == dialogresult.ok) {rtxtNotepad.savefile (sdlgNotepad.filename); } s = true; rtxtNotepad.Text = ""; break; case "No": b = false; rtxtNotepad.Text = ""; break; }}}Copy the code}
When clicking this menu item, if you want to open the “*.rtf” file from disk or other devices, the same decision is made. The difference is that after making the decision, open the file with the OpenFileDialog control and set the previously defined variable (s) to “true” each time after saving the file. Indicates that the file has been saved. The code is as follows: Double-click “Open”, enter the code area and fill in the following code
/ / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / open 】 【 menu code / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
private void tsmiOpen_Click(object sender, EventArgs e)
{
if (b == true || rtxtNotepad.Text.Trim() ! = "") { if (s == false) { string result; Result = messagebox.show (" file not saved, save?") , "save file", MessageBoxButtons YesNoCancel). The ToString (); switch (result) { case "Yes": if (b == true) { rtxtNotepad.SaveFile(odlgNotepad.FileName); } else if (sdlgNotepad.ShowDialog() == DialogResult.OK) { rtxtNotepad.SaveFile(sdlgNotepad.FileName); } s = true; break; case "No": b = false; rtxtNotepad.Text = ""; break; } } } odlgNotepad.RestoreDirectory = true; if ((odlgNotepad.ShowDialog() == DialogResult.OK) && odlgNotepad.FileName ! = "") { rtxtNotepad.LoadFile(odlgNotepad.FileName); // open the code statement b = true; } s = true;Copy the code}
/ / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / [save] menu code //************************************************************************* private void tsmiSave_Click(object sender, EventArgs e)
{
If (b == true && rtxtNotepad.modified == true) {rtxtNotepad.savefile (odlgNotepad.filename); s = true; } else if (b == false && rtxtNotepad.Text.Trim() ! = "" && sdlgNotepad.ShowDialog() == DialogResult.OK) { rtxtNotepad.SaveFile(sdlgNotepad.FileName); // save the statement s = true; b = true; odlgNotepad.FileName = sdlgNotepad.FileName; }Copy the code}
/ / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / code “save as” menu //************************************************************************* private void tsmiSaveAs_Click(object sender, EventArgs e)
{
if (sdlgNotepad.ShowDialog() == DialogResult.OK)
{
rtxtNotepad.SaveFile(sdlgNotepad.FileName);
s = true;
}
Copy the code}
{
Application.Exit(); // End of programCopy the code}
[edit (E)] menu to complete cancellation (a recent to edit the text frame’s operation), copy (copy the selected text content), cut (shear selected text content), paste, paste the contents of the clipboard), future generations (rich text box selected all of the content) and append to a text file of the date of the current function. [Edit (E)] Click event codes of menu items are as follows: / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / click on the edit menu 】 each menu item code / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Private void tsmiUndo_Click(object Sender, EventArgs e) {rtxtNotepad.undo (); / / cancellation}
Private void tsmiCopy_Click(object sender, EventArgs e) {rtxtNotepad.copy (); / / copy}
Private void tsmiCut_Click(object sender, EventArgs e) {rtxtNotepad.cut (); / / shear}
Private void tsmiPaste_Click(object sender, EventArgs e) {rtxtNotepad.paste (); / / paste}
Private void tsmiSelectAll_Click(object sender, EventArgs e) {rtxtNotepad.selectAll (); / / all}
Private void tsmiDate_Click(object sender, EventArgs e) { rtxtNotepad.AppendText(System.DateTime.Now.ToString()); // Display the current date}
{
if (tsmiAuto.Checked == false) { tsmiAuto.Checked = true; // Select the menu item rtxtNotepad.WordWrap = true; } else {tsmiAuto.Checked = false; rtxtNotepad.WordWrap = false; }Copy the code}
{
fdlgNotepad.ShowColor = true;
if (fdlgNotepad.ShowDialog() == DialogResult.OK)
{
rtxtNotepad.SelectionColor = fdlgNotepad.Color;
rtxtNotepad.SelectionFont = fdlgNotepad.Font;
}
Copy the code}
{
Point point; If (tsmitoolstrip.checked == true) {// When hiding the toolbar, set the coordinate to (0, 24) because the menu height is 24 point = new Point(0, 24); tsmiToolStrip.Checked = false; tlsNotepad.Visible = false; Rtxtnotepad. Location = point; Rtxtnotepad. Height += tlsnotepad. Height; } else {/* New point (0, 49);} else {/* New point (0, 49); tsmiToolStrip.Checked = true; tlsNotepad.Visible = true; rtxtNotepad.Location = point; rtxtNotepad.Height -= tlsNotepad.Height; }Copy the code} / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * (2) the status bar (S) 】 【 menu item (not necessary) the menu item is used to control the show and hide the status bar, The status bar is displayed by default, and the height of the multi-format text box should be changed when hidden. The code is as follows: / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / code “status bar” menu //************************************************************************* private void tsmiStatusStrip_Click(object sender, EventArgs e)
{
if (tsmiStatusStrip.Checked == true)
{
tsmiStatusStrip.Checked = false;
stsNotepad.Visible = false;
rtxtNotepad.Height += stsNotepad.Height;
}
else
{
tsmiStatusStrip.Checked = true;
stsNotepad.Visible = true;
rtxtNotepad.Height -= stsNotepad.Height;
}
Copy the code} / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * (6) the help (H) 】 the menu This menu is only one menu item [about notepad (A)], This menu item invokes a form (frmAbout) to display some information about the program. Use the LinkLabel control to set up links that make it easy to send e-mails to authors. The design of the frmAbout form is covered in detail in the next section (17.3.3 About Notepad). After the frmAbout form is designed, in order to display the form, the click event code of the [About Notepad (A)] menu item needs to be written as follows: / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / menu about notebook 】 【 code //************************************************************************* private void tsmiAbout_Click(object sender, EventArgs e)
{
frmAbout ob_FrmAbout = new frmAbout();
ob_FrmAbout.Show();
Copy the code}
Next click the Visual C# 2013 [project] → [add Windows forms] menu item to add a form named “frmAbout”, as shown in the figure.
- Interface design
Then add several Label, Button, LinkLabel and PictrueBox controls to the form “frmAbout”. The program interface after setting the properties according to the information in Figure 3.1 is shown as follows.
Private void btnOk_Click(Object sender, EventArgs e)
{
this.Close();
Copy the code}
/ / use LinkLabel open E-mail or page private void llblEmail_LinkClicked (object sender, LinkLabelLinkClickedEventArgs e)
{
System. Diagnostics. Process. The Start (” www.baidu.com “); }
Case 4: Cut UToolStripButton_Click (sender, e); break; Case 5: Paste PToolStripButton_Click (sender, e); break; /*case 6: tsmiPaste_Click(sender, e); break; Case6 case 7: tsmiAbout_Click (sender, e); break; }Copy the code} / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / toolbar ItemClicked event code / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 1.6 timer code should be displayed in the status bar tssLbl2 current time, We need to write the following code for the timer control to trigger the Tick event (every second) : / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / the Tick event timer control code //************************************************************************* private void tmrNotepad_Tick(object sender, EventArgs e) { tssLbl2.Text = System.DateTime.Now.ToString(); } / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
1.7 Window code (we don’t need this code, it will automatically adjust when the window property is set to Auto). After changing the window size (e.g. maximizing the window size or using the mouse to change the window size), we should write the following SizeChanged event code for the window in order for the labels in the status bar to change their width as well: / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / form SizeChanged event code //************************************************************************* private void frmNotepad_SizeChanged(object sender, EventArgs e) { frmNotepad ob_frmNotepad = new frmNotepad(); tssLbl1.Width = this.Width / 2 – 12; tssLbl2.Width = tssLbl1.Width; } / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * / / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Run screenshot:
