How to read a random line from a text file and change the text in the label to be that random line, then after a drag and drop which i have coded(below) the label will change the text. The language is c#. I am a beginner so i apologize if this is a stupid question.
private void txt_carbs_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Text))
e.Effect = e.AllowedEffect;
// check if the held data format is text
// if it is text allow the effect
else
e.Effect = DragDropEffects.None;
// if it is not text do nothing
}
private void txt_protien_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Text))
e.Effect = e.AllowedEffect;
// check if the held data format is text
// if it is text allow the effect
else
e.Effect = DragDropEffects.None;
// if it is not text do nothing
}
private void txt_fats_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Text))
e.Effect = e.AllowedEffect;
// check if the held data format is text
// if it is text allow the effect
else
e.Effect = DragDropEffects.None;
// if it is not text do nothing
}
private void txt_fats_DragDrop(object sender, DragEventArgs e)
{
txt_fats.Text += e.Data.GetData(DataFormats.Text).ToString();
//add the text into the text box
}
private void txt_protien_DragDrop(object sender, DragEventArgs e)
{
txt_protien.Text += e.Data.GetData(DataFormats.Text).ToString();
//add the text into the text box
}
private void txt_carbs_DragDrop(object sender, DragEventArgs e)
{
txt_carbs.Text += e.Data.GetData(DataFormats.Text).ToString();
//add the text into the text box
}
private void lbl_term_MouseDown(object sender, MouseEventArgs e)
{
lbl_term.DoDragDrop(lbl_term.Text, DragDropEffects.Copy);
// get the text from the label
}
Also this is how ive been changing the labels text however this isn't it isn't randomized
StreamReader score =
new StreamReader(file_location);
label10.Text = score.ReadLine();
Not the most efficient implementation in the world, but you could do the following to get a random line from a file, if the file isn't too big, as described in this answer here:
string[] lines = File.ReadAllLines(file_location);
Random rand = new Random();
return lines[rand.Next(lines.Length)];
Related
I am pasting an item from a TreeView to a TextBox, but I want to paste that item in the mouse's current position and also show a caret like the image below.
Image with caret:
Here is my code:
private void tvOperador_ItemDrag(object sender, ItemDragEventArgs e)
{
var node = (TreeNode)e.Item;
if (node.Level > 0)
{
DoDragDrop(node.Text, DragDropEffects.Copy);
}
}
private void txtExpresion_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(string))) e.Effect = DragDropEffects.Copy;
}
private void txtExpresion_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(System.String)))
{
string Item = (System.String)e.Data.GetData(typeof(System.String));
string[] split = Item.Split(':');
txtExpresion.Text += split[1];
}
}
This is tricky as the Drag&Drop operation keeps the mouse captured, so you can't use the mouse events..
One way is to set up a Timer to do the work..:
Timer cursTimer = new Timer();
void cursTimer_Tick(object sender, EventArgs e)
{
int cp = txtExpresion.GetCharIndexFromPosition(
txtExpresion.PointToClient(Control.MousePosition));
txtExpresion.SelectionStart = cp;
txtExpresion.SelectionLength = 0;
txtExpresion.Refresh();
}
The Timer uses the Control.MousePosition function to determined the cursor position every 25ms or so, sets the caret and updates the TextBox.
In your events you initialize it and make sure the TextBox has focus; finally you add the string at the current selection:
private void txtExpresion_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(string)))
{
e.Effect = DragDropEffects.Copy;
txtExpresion.Focus();
cursTimer = new Timer();
cursTimer.Interval = 25;
cursTimer.Tick += cursTimer_Tick;
cursTimer.Start();
}
}
private void txtExpresion_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(System.String)))
{
cursTimer.Stop();
string Item = (System.String)e.Data.GetData(typeof(System.String));
string[] split = Item.Split(':');
txtExpresion.SelectedText = split[1]
}
}
A different way to solve it would be to not use normal Drag&Drop and only code the mouse events but this one worked ok a my first tests.
Update
While the above solution does work, using a Timer seems not exactly elegant. Much better to use the DragOver event, as seen in Reza's answer. But instead of painting a cursor, why not do the real thing, i.e. take control of the actual I-beam..?
The DragOver event is called all the time during the move so it works pretty much like MousMove would: So here is a merger of the two solutions, which I believe is the best way to do it:
private void txtExpresion_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(System.String)))
{
string Item = (System.String)e.Data.GetData(typeof(System.String));
string[] split = Item.Split(':');
txtExpresion.SelectionLength = 0;
txtExpresion.SelectedText = split[1];
}
}
private void txtExpresion_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(string)))
{
e.Effect = DragDropEffects.Copy;
txtExpresion.Focus();
}
}
private void txtExpresion_DragOver(object sender, DragEventArgs e)
{
int cp = txtExpresion.GetCharIndexFromPosition(
txtExpresion.PointToClient(Control.MousePosition));
txtExpresion.SelectionStart = cp;
txtExpresion.Refresh();
}
You can draw a caret over TextBox in DragOver event. Also set the SelectionStart to the char index you get from mouse position. Then in DragDrop event, just set SelectedText.
private void textBox1_DragOver(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(System.String)))
{
var position = textBox1.PointToClient(Cursor.Position);
var index = textBox1.GetCharIndexFromPosition(position);
textBox1.SelectionStart = index;
textBox1.SelectionLength = 0;
textBox1.Refresh();
using (var g = textBox1.CreateGraphics())
{
var p = textBox1.GetPositionFromCharIndex(index);
g.DrawLine(Pens.Black, p.X, 0, p.X, textBox1.Height);
}
}
}
private void textBox1_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(System.String)))
{
string txt = (System.String)e.Data.GetData(typeof(System.String));
textBox1.SelectedText = txt;
}
}
I'm trying a drag and drop for a tablelayoutpanel in a panel using winforms/c#, the drag of the tablelayout works successfully but the problem is that the tablelayoutpanel droped doesn't appear !!
any solution please ??
private void Registration_Load(object sender, EventArgs e)
{
panel2.AllowDrop = true;
tableLayoutPanel1.AllowDrop = true;
panel2.DragEnter += panel2_DragEnter;
panel2.DragDrop += panel2_DragDrop;
tableLayoutPanel1.MouseDown += tableLayoutPanel1_MouseDown;
}
private void panel2_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Move;
}
private void panel2_DragDrop(object sender, DragEventArgs e)
{
((TableLayoutPanel)e.Data.GetData(typeof(TableLayoutPanel))).Parent (Panel)sender;
}
private void tableLayoutPanel1_MouseDown(object sender, MouseEventArgs e)
{
tableLayoutPanel1.DoDragDrop(tableLayoutPanel1, DragDropEffects.Move);
}
The code is inadequate, you'll need to at least set the Location property of the dropped TLP to ensure it is within the panel bounds and/or located at the mouse cursor. And the Z-order matters, setting the Parent property puts it at the bottom so it can easily be overlapped by other controls in the panel, you need BringToFront().
Try this:
private void panel2_DragEnter(object sender, DragEventArgs e) {
if (e.Data.GetDataPresent(typeof(TableLayoutPanel))) e.Effect = DragDropEffects.Move;
}
private void panel2_DragDrop(object sender, DragEventArgs e) {
var tlp = (TableLayoutPanel)e.Data.GetData(typeof(TableLayoutPanel));
tlp.Location = panel2.PointToClient(new Point(e.X, e.Y));
tlp.Parent = panel2;
tlp.BringToFront();
}
[Solved] I want to drag some DataGridViewRows from a DataGridView, contained in a TabPage, to another DataGridView also contained in another TabPage. I have set the DataGridView's Event (How could I Drag and Drop DataGridView Rows under each other?), but i don't know how I can "navigate" between TabPages!
Here's a bare bone example how I can drag text from one textbox on a tab to another one on a separate tab:
private void textBox1_MouseDown(object sender, MouseEventArgs e)
{
textBox1.DoDragDrop(textBox1.Text, DragDropEffects.Copy | DragDropEffects.Move);
}
private void tabControl1_DragOver(object sender, DragEventArgs e)
{
Point location = tabControl1.PointToClient(Control.MousePosition);
for (int tab = 0; tab < tabControl1.TabCount; ++tab)
{
if (tabControl1.GetTabRect(tab).Contains(location))
{
tabControl1.SelectedIndex = tab;
break;
}
}
}
private void textBox2_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Text))
e.Effect = DragDropEffects.Copy;
else
e.Effect = DragDropEffects.None;
}
private void textBox2_DragDrop(object sender, DragEventArgs e)
{
textBox2.Text = e.Data.GetData(DataFormats.Text).ToString();
}
NOTE: You must set AllowDrop property to true on the TabControl, and of course on the destination control.
Cheers
I have solved the question by myself (and #mrlucmorin) :
internal void dgv_MouseDown(object sender, MouseEventArgs e)
{
DataGridView dgv = (DataGridView)sender;
List<DataGridViewRow> result = new List<DataGridViewRow>();
foreach(DataGridViewRow row in dgv.SelectedRows)
{
result.Add(row);
}
dgv.DoDragDrop(result, DragDropEffects.Copy | DragDropEffects.Move);
}
private void dgv_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
}
private void dgv_DragDrop(object sender, DragEventArgs e)
{
try
{
DataGridView dataGridView1 = (DataGridView)sender;
List<DataGridViewRow> rows = new List<DataGridViewRow>();
rows = (List<DataGridViewRow>)e.Data.GetData(rows.GetType());
//some stuff
}
}
I have two TextBoxes and a button control in the form. When the button is clicked the name of the last entered TextBox should be displayed in a MessageBox. At the same time I need to reset the focus to last entered TextBox.
string str=string.Empty;
bool foc;
In button click I wrote the following code
if (MessageBox.Show("You want to reset or continue", "control",
MessageBoxButtons.OKCancel) == DialogResult.Cancel)
{
if (foc== true)
{
textBox1.Focus();
}
else
{
textBox2.Focus();
}
}
When I clicks on cancel button the focus should be into textbox which is entered at last
private void textBox1_Enter(object sender, EventArgs e)
{
str = textBox1.Name;
foc= textBox1.Focus();
}
private void textBox2_Enter(object sender, EventArgs e)
{
str= textBox2.Name;
foc= false;
}
Other than the above lines of code is there any other possibility to focus into the textbox, but when number of textboxes increases how i need to write the conditions.
If I am having textbox,combobox,listbox,checkbox or any other controls in the form then how to find in which control the user enterd at last and set focus to that control by using any function instead of writing in every control Enter event
You can handle Leave event of the TextBoxes to store the Last TextBox Control.
Try this:
this.btnSubmit.Click += new System.EventHandler(this.Submit_Click);
this.btnCancel.Click += new System.EventHandler(this.Cancel_Click);
this.textBox1.Leave += new System.EventHandler(this.textBox1_Leave);
this.textBox2.Leave += new System.EventHandler(this.textBox2_Leave);
TextBox txtLast = new TextBox();
private void textBox1_Leave(object sender, EventArgs e)
{
txtLast = (TextBox)sender;
}
private void textBox2_Leave(object sender, EventArgs e)
{
txtLast = (TextBox)sender;
}
private void Submit_Click(object sender, EventArgs e)
{
MessageBox.Show(txtLast.Text);
}
private void Cancel_Click(object sender, EventArgs e)
{
txtLast.Focus();
}
public bool textBox1WasLastFocused = false, textBox2WasLastFocused = false; // Global Declaration
void textBox2_GotFocus(object sender, EventArgs e)
{
textBox2WasLastFocused = true;
textBox1WasLastFocused = false;
}
void textBox1_GotFocus(object sender, EventArgs e)
{
textBox1WasLastFocused = true;
textBox2WasLastFocused = false;
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1WasLastFocused)
MessageBox.Show("textbox1 was ladst focused !");
else if(textBox2WasLastFocused)
MessageBox.Show("textbox2 was ladst focused !");
}
When I click on a textbox, I want the default text to disappear. Is there any other property that would work for this purpose?
The following Will set Default text in Gray color. Also When you leave the textbox as blank, again set default text to the textbox.
private void Form1_Load(object sender, EventArgs e)
{
this.textBox2.Enter += new EventHandler(textBox2_Enter);
this.textBox2.Leave += new EventHandler(textBox2_Leave);
textBox2_SetText();
}
protected void textBox2_SetText()
{
this.textBox2.Text = "Default Text...";
textBox2.ForeColor = Color.Gray;
}
private void textBox2_Enter(object sender, EventArgs e)
{
if (textBox2.ForeColor == Color.Black)
return;
textBox2.Text = "";
textBox2.ForeColor = Color.Black;
}
private void textBox2_Leave(object sender, EventArgs e)
{
if (textBox2.Text.Trim() == "")
textBox2_SetText();
}
Add a method to the GotFocus event of the TextBox that will change the Text property to ""
private void Form1_Load(object sender, EventArgs e) {
this.textBox1.GotFocus += new EventHandler(textBox1_Focus);
this.textBox1.Text = "some default text...";
}
protected void textBox1_Focus(Object sender, EventArgs e) {
textBox1.Text = "";
}
It sounds like you are wanting a Watermark in your Textbox.
See these articles.
http://www.codeproject.com/Articles/319910/Custom-TextBox-with-watermark
Watermark in System.Windows.Forms.TextBox
and if you are using wpf something like this http://msdn.microsoft.com/en-us/library/bb613590.aspx