C# Discussion Boards - CodeProject

how to improve paint() speed?

15-Dec-15 5:52

A little Linq, perhaps:

int[] iary = new[] { 5, 4, 1, 3, 2 };
var sorted = iary.OrderBy(itm1 => itm1).ToArray();
var unsortedIndexes = sorted.Select(itm2 => Array.IndexOf(iary, itm2, 0)).ToArray();

Note that using 'OrderBy creates a copy of the Array.

>? sorted
{int[5]}
    [0]: 1
    [1]: 2
    [2]: 3
    [3]: 4
    [4]: 5

> ? unsortedIndexes
{int[5]}
    [0]: 2
    [1]: 4
    [2]: 3
    [3]: 1
    [4]: 0

> ? iary // after creating 'sorted using 'OrderBy
{int[5]}
    [0]: 5
    [1]: 4
    [2]: 1
    [3]: 3
    [4]: 2

«Tell me and I forget. Teach me and I remember. Involve me and I learn.» Benjamin Franklin

modified 15-Dec-15 11:23am.

smallkubi14-Dec-15 20:26

smallkubi

14-Dec-15 20:26

hi, i have a question.
When i use chart1.invalidate() to refresh chart, it had 3 ms cost betten call chart_paint(), Then i called chart_paint() manully on other thread, it cost less than 1ms,it can reach my requirement. But chart has no refresh, it can not clean up history paint.
So i want to know how to invalidate chart control ,but not to call paint aotumatic?

Re: how to improve paint() speed?

BillWoodruff14-Dec-15 22:44

Re: how to improve paint() speed?

14-Dec-15 22:44

Have you tried over-riding the Paint Event ?

«Tell me and I forget. Teach me and I remember. Involve me and I learn.» Benjamin Franklin

smallkubi15-Dec-15 1:03

smallkubi

15-Dec-15 1:03

how can i overriding the paint event? please help me a example

c# problem with combobox in form opened in panel

Member 1182236414-Dec-15 6:27

Re: c# problem with combobox in form opened in panel

14-Dec-15 6:27

I got problem with ComboBox in winforms c#. Comboboxes in main window works fine, but comboboxes in form that I open in panel on main window are broken. The wierd things starts to happen... I cant click it to type. I can only open list, select one and then type. Also i cant locate cursor in the middle of text because it highlight whole text. I post code with I open form in panel:

public void otworzOkno(Form _form)
{
    if (Application.OpenForms[_form.Name] != null)
    {
        Application.OpenForms[_form.Name].WindowState = FormWindowState.Normal;
        Application.OpenForms[_form.Name].BringToFront();
    }
    else
    {
        _form.TopLevel = false; 
        _form.AutoScroll = true;
        this.panel.Controls.Add(_form);
        _form.Show();
        _form.BringToFront();
    }      
}

Video that will explain problem: https://youtu.be/PrVxFWvhPyc

Simon_Whale14-Dec-15 6:37

Re: c# problem with combobox in form opened in panel

14-Dec-15 6:37

how have you constructed the comboboxes?
do they have an assigned datasource?
do they share datasources?

how you are showing the way that you are opening the form that they are on doesn't show the problem it's on that form.

Every day, thousands of innocent plants are killed by vegetarians.

Help end the violence EAT BACON

Member 1182236414-Dec-15 6:47

Re: c# problem with combobox in form opened in panel

14-Dec-15 6:47

The problem is that the form is opened in panel, because when i open the same form with the same settings in seperate window not in panel it works fine. I dont know why that happen

Simon_Whale14-Dec-15 6:51

Re: c# problem with combobox in form opened in panel

14-Dec-15 6:51

as a Test I would change your code to this, I do something similar but I use a splitter container.

public void otworzOkno(Form _form)
{
    if (Application.OpenForms[_form.Name] != null)
    {
        Application.OpenForms[_form.Name].WindowState = FormWindowState.Normal;
        Application.OpenForms[_form.Name].BringToFront();
    }
    else
    {
        _form.TopLevel = false;
        _form.Parent = panel;
        _form.Show();
        _form.BringToFront();
    }      
}

Every day, thousands of innocent plants are killed by vegetarians.

Help end the violence EAT BACON

Member 1182236414-Dec-15 6:56

Re: c# problem with combobox in form opened in panel

14-Dec-15 6:56

Still the same, even when I tried in SplitContainer ;/

Simon_Whale14-Dec-15 6:57

Re: c# problem with combobox in form opened in panel

14-Dec-15 6:57

you then need to show how the combo's are generated and populated.

Every day, thousands of innocent plants are killed by vegetarians.

Help end the violence EAT BACON

Member 1182236414-Dec-15 7:04

Re: c# problem with combobox in form opened in panel

14-Dec-15 7:04

I create it in visual studio (from toolbox) and even empty comboboxes with default settings, no code, just draged and droped has the same behaviour.

Eddy Vluggen14-Dec-15 7:13

Eddy Vluggen

14-Dec-15 7:13

..which is tucked away in a method called "InitializeComponent". That method is called when the form is created. Hiding the form and showing it won't execute the method again. Yes, that may cause weird stuff.

I'd recommend showdialog a form and disposing it when done, preferably wrapped in a using-construct.

--edit
~~foxed~~ fixed typo.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Re: c# problem with combobox in form opened in panel

Simon_Whale14-Dec-15 7:16

Re: c# problem with combobox in form opened in panel

14-Dec-15 7:16

in simple demo of what you are attempting https://onedrive.live.com/redir?resid=A540FA167FE737FC%215823[^]

I've built it using Visual Studio 2010

Every day, thousands of innocent plants are killed by vegetarians.

Help end the violence EAT BACON

Member 1182236414-Dec-15 7:25

Re: c# problem with combobox in form opened in panel

14-Dec-15 7:25

Yeah exaclty. But when form is open in panel i can only click on blue site (http://postimg.org/image/lalx7hu9x/[^]) to write and cant edit text like in my movie. when i open the same form as new form i can click on blue and red site to start typing. In your solution is the same problem and its very annoying. Btw thank you for your help and involvement

Simon_Whale14-Dec-15 7:27

Re: c# problem with combobox in form opened in panel

14-Dec-15 7:27

Sorry stupid mistake, for this to work you have to change the border style of the form with the comboboxes to none.

Every day, thousands of innocent plants are killed by vegetarians.

Help end the violence EAT BACON

Member 1182236414-Dec-15 7:32

Re: c# problem with combobox in form opened in panel

14-Dec-15 7:32

Woow! Thank you so much Smile | :)

I dont understand why it happens with borders but it works correctly. Again thank you so much

Member 1182236414-Dec-15 7:29

Re: c# problem with combobox in form opened in panel

14-Dec-15 7:29

I added some code:

private void cbProducent_MouseClick(object sender, MouseEventArgs e)
{
    if(cbProducent.Text == "")
    {
        cbProducent.Focus();
    }
}

still cant click to writte in middle of text but it solves problem with blue and red sites ;D

BillWoodruff14-Dec-15 8:28

Re: c# problem with combobox in form opened in panel

14-Dec-15 8:28

Don't use Forms inside any other ContainerControl. Use UserControls, or Panels. Forms are "expensive" UI-components, and they do not play well used inside other Forms/Controls.

«Tell me and I forget. Teach me and I remember. Involve me and I learn.» Benjamin Franklin

Member 1182236414-Dec-15 9:17

Re: c# problem with combobox in form opened in panel

14-Dec-15 9:17

Tanks for your reply Smile | :)

The program that im actually writting is pretty small and its too late to make changes. But im sure I will consider your solution in my future applications Smile | :)

BillWoodruff14-Dec-15 18:01