On the goal to learn how to create C# Form components. I decided to create a label which the text can be selected with caret showing the current selection position. Using the code below i successfully added the text with custom color and font. But the caret is not showing. I used CreateCaret and ShowCaret of user32 to create and display the caret.
class MyCustomLabel : Control
{
string[] lines;
public MyCustomLabel ()
{
lines = new string[] {
"public class MyApp {",
" System.Console.WriteLine(\"Hello,World\");",
"}"};
CreateCaret(Handle, IntPtr.Zero, 10, Height);
ShowCaret(Handle);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
StringFormat fmt = StringFormat.GenericTypographic;
fmt.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
for (int i = 0; i < lines.Length; ++i)
e.Graphics.DrawString(lines[i], Font, new SolidBrush(this.ForeColor),
0, Font.Height * i, StringFormat.GenericTypographic);
}
[DllImport("user32")]
private extern static bool ShowCaret(IntPtr hwnd);
[DllImport("user32")]
private extern static int CreateCaret(IntPtr hwnd, IntPtr hBitmap, int width, int height);
}
At first place i want to have the Caret displayed and it will be appreciate if there is an example with selection.
Related
I want to align my text in combo box so that it will show in the center of combobox tell me how to do this also you can see there is a default border around a combo box when it is in focus how can i remove that border also
Kindly solve my two problems
Thanks
This article will help you: http://blog.michaelgillson.org/2010/05/18/left-right-center-where-do-you-align/
The trick is to set the DrawMode-Property of the ComboBox to OwnerDrawFixed as well as subscribe to its event DrawItem.
Your event should contain the following code:
// Allow Combo Box to center aligned
private void cbxDesign_DrawItem(object sender, DrawItemEventArgs e)
{
// By using Sender, one method could handle multiple ComboBoxes
ComboBox cbx = sender as ComboBox;
if (cbx != null)
{
// Always draw the background
e.DrawBackground();
// Drawing one of the items?
if (e.Index >= 0)
{
// Set the string alignment. Choices are Center, Near and Far
StringFormat sf = new StringFormat();
sf.LineAlignment = StringAlignment.Center;
sf.Alignment = StringAlignment.Center;
// Set the Brush to ComboBox ForeColor to maintain any ComboBox color settings
// Assumes Brush is solid
Brush brush = new SolidBrush(cbx.ForeColor);
// If drawing highlighted selection, change brush
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
brush = SystemBrushes.HighlightText;
// Draw the string
e.Graphics.DrawString(cbx.Items[e.Index].ToString(), cbx.Font, brush, e.Bounds, sf);
}
}
}
To right align the items you can simply replace StringAlignment.Center with StringAlignment.Far.
This isn't supported for ComboBox. The exact reasons are lost in the fog of time, ComboBox has been around since the early nineties, but surely has something to do with the awkwardness of getting the text in the textbox portion to line up with the text in the dropdown. Custom drawing with DrawItem cannot solve it either, that only affects the appearance of the dropdown items.
As a possible workaround, you could perhaps do something outlandish like padding the item strings with spaces so they look centered. You'll need TextRenderer.MeasureText() to figure out how many spaces to add for each item.
The "border" you are talking about is not a border, it is the focus rectangle. You can't get rid of that either, Windows refuses to let you create a UI that won't show the control with the focus. Users that prefer the keyboard over the mouse care about that. No workaround for that one.
Set RightToLeft property to true.
It does NOT reverse the sequence of characters. It only right-justifies.
The post is a bit old but it may be still worth to say:
both requirements are possible for Windows Forms ComboBox:
Text align center (text area and the dropdown)
For the text area, find the Edit control and set the ES_CENTER style for the control.
For the dropdown items or the selected item in drop-down mode, to align text to center, just make the control owner-drawn and draw the text at center.
Get rid of focus rectangle
Make the control owner-drawn and just don't draw focus rectangle.
Example
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
public class MyComboBox : ComboBox
{
public MyComboBox()
{
DrawMode = DrawMode.OwnerDrawFixed;
}
[DllImport("user32.dll")]
static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll")]
static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
const int GWL_STYLE = -16;
const int ES_LEFT = 0x0000;
const int ES_CENTER = 0x0001;
const int ES_RIGHT = 0x0002;
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int Left;
public int Top;
public int Right;
public int Bottom;
public int Width { get { return Right - Left; } }
public int Height { get { return Bottom - Top; } }
}
[DllImport("user32.dll")]
public static extern bool GetComboBoxInfo(IntPtr hWnd, ref COMBOBOXINFO pcbi);
[StructLayout(LayoutKind.Sequential)]
public struct COMBOBOXINFO
{
public int cbSize;
public RECT rcItem;
public RECT rcButton;
public int stateButton;
public IntPtr hwndCombo;
public IntPtr hwndEdit;
public IntPtr hwndList;
}
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
SetupEdit();
}
private int buttonWidth = SystemInformation.HorizontalScrollBarArrowWidth;
private void SetupEdit()
{
var info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(this.Handle, ref info);
var style = GetWindowLong(info.hwndEdit, GWL_STYLE);
style |= 1;
SetWindowLong(info.hwndEdit, GWL_STYLE, style);
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
base.OnDrawItem(e);
e.DrawBackground();
var txt = "";
if (e.Index >= 0)
txt = GetItemText(Items[e.Index]);
TextRenderer.DrawText(e.Graphics, txt, Font, e.Bounds,
ForeColor, TextFormatFlags.Left | TextFormatFlags.HorizontalCenter);
}
}
you can do something like this by adding space before Display member in your Query
for example :
combobox1.DataSource = Query(Select col1 , (' '+col2) as Col2 from tableName)
combobox1.DisplayMember = "Col2";
combobox1.ValueMember = "col1";
Let me start by saying that I am no stranger to using winapi calls to manipulate other windows, but this is the first time I have seen a window that has two identical control IDs. It seems that the color dialog hasn't changed much between windows versions and I can confirm that this behavior exists on all color dialogs from Windows Vista through to Windows 10 (possibly exists in win xp and lower as well but I can't be bothered to check).
What I am attempting to do is use winapi calls to localize the text in a color dialog control in C#. The best way I have found to do this is to use GetDlgItem() to get a handle to the control I wish to change and then use SetWindowText() to actually change the text. This works great for all controls on the color dialog except for the 'Basic colors:' and 'Custom colors:' labels, which both have a control ID of 0xFFFF (decimal value: 65535).
I use an app called WinID to do this type of work (I find it much easier than using Spy++) and you can see from the screenshots below that the ID of the two text labels do in-fact register as the same ID.
NOTE: I have
tested this using Spy++ and of course I get the same values as shown below:
I would like to know 2 things:
How is it possible for 2 controls to have the same control id?
Is there a 'better way' to get a handle to a control from an external dialog/app using winapi calls? Please keep in mind that using something like FindWindowEx(nColorDialogHandle, IntPtr.Zero, "Static", "&custom colors:"); works, but is not useful to me because I must be able to find the handle without relying on the text in English since this must also work on color dialogs from a non-English version of Windows.
Below is some sample code to demonstrate how I am currently able to change the text on a color dialog. I am happy with the code except that I am unable to get a direct handle to the 'Custom colors:' label since using GetDlgItem() with the control id of 0xFFFF seems to return a handle to the first instance of the control with that ID (in this case it always returns a handle to the 'Basic colors:' label). The only way I am able to get the 'Custom colors:' handle is by using an indirect method of looping through all controls on the color dialog until I find one with text that has not already been changed. This works fine but I would like to know if there is a more direct way to get this handle without looping through controls:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// Open the color dialog before the form actually loads
ColorDialogEx oColorDialog = new ColorDialogEx(this.CreateGraphics());
oColorDialog.FullOpen = true;
oColorDialog.ShowDialog();
}
}
public class ColorDialogEx : ColorDialog
{
private const Int32 WM_INITDIALOG = 0x0110; // Windows Message Constant
private Graphics oGraphics;
private const uint GW_HWNDLAST = 1;
private const uint GW_HWNDPREV = 3;
private string sColorPickerText = "1-Color Picker";
private string sBasicColorsText = "2-Basic colors:";
private string sDefineCustomColorsButtonText = "3-Define Custom Colors >>";
private string sOKButtonText = "4-OK";
private string sCancelButtonText = "5-Cancel";
private string sAddToCustomColorsButtonText = "6-Add to Custom Colors";
private string sColorText = "7-Color";
private string sSolidText = "|8-Solid";
private string sHueText = "9-Hue:";
private string sSatText = "10-Sat:";
private string sLumText = "11-Lum:";
private string sRedText = "12-Red:";
private string sGreenText = "13-Green:";
private string sBlueText = "14-Blue:";
private string sCustomColorsText = "15-Custom colors:";
// WinAPI definitions
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern bool SetWindowText(IntPtr hWnd, string text);
[DllImport("user32.dll", SetLastError = true)]
internal static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);
[DllImport("user32.dll")]
public static extern long GetWindowRect(int hWnd, ref Rectangle lpRect);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool GetTitleBarInfo(IntPtr hwnd, ref TITLEBARINFO pti);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("user32.dll")]
private static extern IntPtr GetDlgItem(IntPtr hDlg, int nIDDlgItem);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern int GetClassName(IntPtr hWnd, System.Text.StringBuilder lpClassName, int nMaxCount);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);
[StructLayout(LayoutKind.Sequential)]
struct TITLEBARINFO
{
public const int CCHILDREN_TITLEBAR = 5;
public uint cbSize;
public RECT rcTitleBar;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = CCHILDREN_TITLEBAR + 1)]
public uint[] rgstate;
}
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int Left, Top, Right, Bottom;
public RECT(int left, int top, int right, int bottom)
{
Left = left;
Top = top;
Right = right;
Bottom = bottom;
}
public RECT(System.Drawing.Rectangle r) : this(r.Left, r.Top, r.Right, r.Bottom) { }
public int X
{
get { return Left; }
set { Right -= (Left - value); Left = value; }
}
public int Y
{
get { return Top; }
set { Bottom -= (Top - value); Top = value; }
}
public int Height
{
get { return Bottom - Top; }
set { Bottom = value + Top; }
}
public int Width
{
get { return Right - Left; }
set { Right = value + Left; }
}
public System.Drawing.Point Location
{
get { return new System.Drawing.Point(Left, Top); }
set { X = value.X; Y = value.Y; }
}
public System.Drawing.Size Size
{
get { return new System.Drawing.Size(Width, Height); }
set { Width = value.Width; Height = value.Height; }
}
public static implicit operator System.Drawing.Rectangle(RECT r)
{
return new System.Drawing.Rectangle(r.Left, r.Top, r.Width, r.Height);
}
public static implicit operator RECT(System.Drawing.Rectangle r)
{
return new RECT(r);
}
public static bool operator ==(RECT r1, RECT r2)
{
return r1.Equals(r2);
}
public static bool operator !=(RECT r1, RECT r2)
{
return !r1.Equals(r2);
}
public bool Equals(RECT r)
{
return r.Left == Left && r.Top == Top && r.Right == Right && r.Bottom == Bottom;
}
public override bool Equals(object obj)
{
if (obj is RECT)
return Equals((RECT)obj);
else if (obj is System.Drawing.Rectangle)
return Equals(new RECT((System.Drawing.Rectangle)obj));
return false;
}
public override int GetHashCode()
{
return ((System.Drawing.Rectangle)this).GetHashCode();
}
public override string ToString()
{
return string.Format(System.Globalization.CultureInfo.CurrentCulture, "{{Left={0},Top={1},Right={2},Bottom={3}}}", Left, Top, Right, Bottom);
}
}
public ColorDialogEx(Graphics g)
{
oGraphics = g;
}
protected override IntPtr HookProc(IntPtr nColorDialogHandle, int msg, IntPtr wparam, IntPtr lparam)
{
IntPtr returnValue = base.HookProc(nColorDialogHandle, msg, wparam, lparam);
if (msg == WM_INITDIALOG)
{
IntPtr[] oStaticHandleArray = new IntPtr[9];
// Change the window title
SetWindowText(nColorDialogHandle, sColorPickerText);
// Get titlebar info for calculations later
TITLEBARINFO oTITLEBARINFO = new TITLEBARINFO();
oTITLEBARINFO.cbSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(oTITLEBARINFO);
GetTitleBarInfo(nColorDialogHandle, ref oTITLEBARINFO);
// Change the text of the "Basic colors:" label
oStaticHandleArray[0] = GetDlgItem(nColorDialogHandle, 0xFFFF);
SetWindowText(oStaticHandleArray[0], sBasicColorsText);
// Change the text of the "Define Custom Colors >>" button
SetWindowText(GetDlgItem(nColorDialogHandle, 0x2CF), sDefineCustomColorsButtonText);
// Save the "OK" button size and new width
Rectangle oOKButtonRect = new Rectangle();
int nOKButtonWidth = (int)oGraphics.MeasureString(sOKButtonText, new Font("Microsoft Sans Serif", 8, FontStyle.Regular)).Width + 20; // +20 accounts for extra +10 padding on either side
// Find the "OK" Button
IntPtr nChildHandle = GetDlgItem(nColorDialogHandle, 0x1);
if (nChildHandle.ToInt32() > 0)
{
// The "OK" button was found
// Now save the current size and position
GetWindowRect(nChildHandle.ToInt32(), ref oOKButtonRect);
// We have to subtract oOKButtonRect.X value from oOKButtonRect.Width to obtain the "real" button width (same thing with subtracting Y value from Height)
oOKButtonRect.Width = oOKButtonRect.Width - oOKButtonRect.X;
oOKButtonRect.Height = oOKButtonRect.Height - oOKButtonRect.Y;
// Resize the "OK" button so that the new text fits properly
// NOTE: I cannot be sure 100% if it is correct to use the titlebar to find the position of the button or not but the math works out in all of my tests
MoveWindow(nChildHandle, oOKButtonRect.X - oTITLEBARINFO.rcTitleBar.X, oOKButtonRect.Y - oTITLEBARINFO.rcTitleBar.Y - oTITLEBARINFO.rcTitleBar.Height, nOKButtonWidth, oOKButtonRect.Height, true);
// Finally, change the button text
SetWindowText(nChildHandle, sOKButtonText);
}
// Find the "Cancel" Button
nChildHandle = GetDlgItem(nColorDialogHandle, 0x2);
if (nChildHandle.ToInt32() > 0)
{
// The "Cancel" button was found
// Now get the current size and position
Rectangle oCancelButtonRect = new Rectangle();
GetWindowRect(nChildHandle.ToInt32(), ref oCancelButtonRect);
// We have to subtract oCancelButtonRect.X value from oCancelButtonRect.Width to obtain the "real" button width (same thing with subtracting Y value from Height)
oCancelButtonRect.Width = oCancelButtonRect.Width - oCancelButtonRect.X;
oCancelButtonRect.Height = oCancelButtonRect.Height - oCancelButtonRect.Y;
// Resize the "Cancel" button so that the new text fits properly
// NOTE: I cannot be sure 100% if it correct to use the titlebar to find the position of the button or not but the math works out in all of my tests
MoveWindow(nChildHandle, oOKButtonRect.X + nOKButtonWidth - oTITLEBARINFO.rcTitleBar.X + 6, oCancelButtonRect.Y - oTITLEBARINFO.rcTitleBar.Y - oTITLEBARINFO.rcTitleBar.Height, (int)oGraphics.MeasureString(sCancelButtonText, new Font("Microsoft Sans Serif", 8, FontStyle.Regular)).Width + 20, oCancelButtonRect.Height, true);
// Finally, change the button text
SetWindowText(nChildHandle, sCancelButtonText);
}
// Change the text of the "Add to Custom Colors" button
SetWindowText(GetDlgItem(nColorDialogHandle, 0x2C8), sAddToCustomColorsButtonText);
// Change the text of the "Color" label text
oStaticHandleArray[1] = GetDlgItem(nColorDialogHandle, 0x2DA);
SetWindowText(oStaticHandleArray[1], sColorText);
// Change the text of the "Solid" label text
oStaticHandleArray[2] = GetDlgItem(nColorDialogHandle, 0x2DB);
SetWindowText(oStaticHandleArray[2], sSolidText);
// Change the text of the "Hue:" label
oStaticHandleArray[3] = GetDlgItem(nColorDialogHandle, 0x2D3);
SetWindowText(oStaticHandleArray[3], sHueText);
// Change the text of the "Sat:" label
oStaticHandleArray[4] = GetDlgItem(nColorDialogHandle, 0x2D4);
SetWindowText(oStaticHandleArray[4], sSatText);
// Change the text of the "Lum:" label
oStaticHandleArray[5] = GetDlgItem(nColorDialogHandle, 0x2D5);
SetWindowText(oStaticHandleArray[5], sLumText);
// Change the text of the "Red:" label
oStaticHandleArray[6] = GetDlgItem(nColorDialogHandle, 0x2D6);
SetWindowText(oStaticHandleArray[6], sRedText);
// Change the text of the "Green:" label
oStaticHandleArray[7] = GetDlgItem(nColorDialogHandle, 0x2D7);
SetWindowText(oStaticHandleArray[7], sGreenText);
// Change the text of the "Blue:" label
oStaticHandleArray[8] = GetDlgItem(nColorDialogHandle, 0x2D8);
SetWindowText(oStaticHandleArray[8], sBlueText);
// Change the text of the "Custom Colors:" label
SetCustomColorsText(nColorDialogHandle, oStaticHandleArray);
}
return returnValue;
}
private static string GetClassName(IntPtr nHandle)
{
// Create the stringbuilder object that is used to get the window class name from the GetClassName win api function
System.Text.StringBuilder sClassName = new System.Text.StringBuilder(100);
GetClassName(nHandle, sClassName, sClassName.Capacity);
return sClassName.ToString();
}
private static string GetWindowText(IntPtr nHandle)
{
// Create the stringbuilder object that is used to get the window text from the GetWindowText win api function
System.Text.StringBuilder sWindowText = new System.Text.StringBuilder(100);
GetWindowText(nHandle, sWindowText, sWindowText.Capacity);
return sWindowText.ToString();
}
private void SetCustomColorsText(IntPtr nHandle, IntPtr[] oStaticHandleArray)
{
// Find the last control based on the handle to the main window
IntPtr nWorkingHandle = GetWindow(FindWindowEx(nHandle, IntPtr.Zero, null, null), GW_HWNDLAST);
bool bFound = false;
do
{
// Look only for "Static" controls that we have not already changed
if (GetClassName(nWorkingHandle) == "Static" && oStaticHandleArray.Contains(nWorkingHandle) == false)
{
// Found a "Static" control
// Check to see if it is the one we are looking for
string sControlText = GetWindowText(nWorkingHandle);
if (sControlText != "")
{
// Found the "Custom Colors:" label
// Change the text of the "Custom Colors:" label
SetWindowText(nWorkingHandle, sCustomColorsText);
bFound = true;
}
}
// Working backwards we look for the previous control
nWorkingHandle = GetWindow(nWorkingHandle, GW_HWNDPREV);
// Jump out of the loop when the working handle doesn't find anymore controls
if (nWorkingHandle == IntPtr.Zero)
break;
} while (bFound == false);
}
}
}
This dialog is already localized. You can look at it with Visual Studio. Copy c:\windows\system32\en-US\comdlg32.dll.mui to, say, c:\temp\test.dll. Replace "en-US" with your local language tag. In VS use File > Open > File and pick test.dll. You'll see the resources in the MUI file, open the Dialog node and double-click the one named "CHOOSECOLOR". The resource editor opens, you can pick an item in the dialog template and look at its properties in the Property window.
Hopefully it is obvious why the STATIC control has the default IDSTATIC id (65535), there is no need for Windows to do anything to change its properties so no need to find it back. And not for you either, your user will have his own copy of the MUI file that contains the dialog with strings in his native language.
Do note that a machine usually only has MUI files for a single language. If you need to do this to, say, create screenshots for documentation then start here.
I have a cursor image .cur with maximum Width and Height of 250 pixels which i fully need.
I already managed to the replace the mouse pointer image with this cur image instead when holding right click.
The problem is that when using I'm doing that the pointer is associated with the top left corner of the image so when I go beyond for example the bounds of the canvas the cur image disappear and I go back to the normal pointer image.
I want this cur image to be centered on the mouse pointer location, not on it's top left corner. How can I do that?
private void canvas_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
Cursor cPro = new Cursor(#"C:\Users\Faris\Desktop\C# Testing Projects\cPro.cur");
globalValues.cursorSave = canvas.Cursor;
canvas.Cursor = cPro;
}
private void canvas_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
{
canvas.Cursor = globalValues.cursorSave;
}
You have two options:
In Visual Studio, open the cursor file or resource in the image editor and select the Hotspot Tool from the toolbar. Then click on the new hotspot and save the file.
Create a cursor pragmatically using a bitmap and specify the hot spot yourself.
The code below is from here:
namespace CursorTest
{
public struct IconInfo
{
public bool fIcon;
public int xHotspot;
public int yHotspot;
public IntPtr hbmMask;
public IntPtr hbmColor;
}
public class CursorTest : Form
{
public CursorTest()
{
this.Text = "Cursor Test";
Bitmap bitmap = new Bitmap(140, 25);
Graphics g = Graphics.FromImage(bitmap);
using (Font f = new Font(FontFamily.GenericSansSerif, 10))
g.DrawString("{ } Switch On The Code", f, Brushes.Green, 0, 0);
this.Cursor = CreateCursor(bitmap, 3, 3);
bitmap.Dispose();
}
[DllImport("user32.dll")]
public static extern IntPtr CreateIconIndirect(ref IconInfo icon);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);
public static Cursor CreateCursor(Bitmap bmp, int xHotSpot, int yHotSpot)
{
IconInfo tmp = new IconInfo();
GetIconInfo(bmp.GetHicon(), ref tmp);
tmp.xHotspot = xHotSpot;
tmp.yHotspot = yHotSpot;
tmp.fIcon = false;
return new Cursor(CreateIconIndirect(ref tmp));
}
}
}
I want to change the font size of calender control in Win7 to make it touch screen compatible. The theme in my machine is Aero. CalendarFont property does not have any effect on the Aero theme.
So I have overrided OnDropDown method to disable theme for the calander control. Now the font has changed, but the calender window size is not changed. The following image shows the window I am seeing
The code is given below. What should I do to increase the size of the calender window?
protected override void OnDropDown(EventArgs e)
{
IntPtr pointerToCalenderWindow = SendMessage(Handle, DtmGetmonthcal,0,0);
// Disble Theme
SetWindowTheme(pointerToCalenderWindow, "", "");
var rect = new Rectangle();
SendMessage(pointerToCalenderWindow, McmGetminreqrect, 0, ref rect);
MoveWindow(pointerToCalenderWindow,0,0,rect.Right + 2, rect.Bottom + 2, true);
base.OnDropDown(e);
}
private const int McmFirst = 0x1000;
private const int McmGetminreqrect = (McmFirst + 9);
private const int McsWeeknumbers = 0x4;
private const int DtmFirst = 0x1000;
private const int DtmGetmonthcal = (DtmFirst + 8);
private const int WMPAINT = 0x000F;
[DllImport("uxtheme.dll")]
private static extern int SetWindowTheme(IntPtr hWnd, string appname, string idlist);
[DllImport("User32.dll")]
private static extern IntPtr SendMessage(IntPtr h,
int msg,
int param,
int data);
[DllImport("User32.dll")]
private static extern int MoveWindow(IntPtr h,
int x,
int y,
int width,
int height,
bool repaint);
It seems that this question is about the same problem as yours:
The answer states that there are actually two windows used for the calendar part (an 'inner' and an 'outer' one) and that you need to set the size for the outer window correctly.
I am building a Windows Forms applicaton in C# and have a TrackBar on my Form. How can I compute the (pixel) position of the tip of the tracker? I would like to draw a line from there to another point on my form.
Additionally I also would like to compute the lowest and highest possible x position of the tip.
The native Windows control that is wrapped by TrackBar has an awkward restriction, you cannot get the positions for the first and last tic marks. You can however get the display rectangles for the channel and the slider. This class returns them:
using System;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;
class MyTrackBar : TrackBar {
public Rectangle Slider {
get {
RECT rc = new RECT();
SendMessageRect(this.Handle, TBM_GETTHUMBRECT, IntPtr.Zero, ref rc);
return new Rectangle(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top);
}
}
public Rectangle Channel {
get {
RECT rc = new RECT();
SendMessageRect(this.Handle, TBM_GETCHANNELRECT, IntPtr.Zero, ref rc);
return new Rectangle(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top);
}
}
private const int TBM_GETCHANNELRECT = 0x400 + 26;
private const int TBM_GETTHUMBRECT = 0x400 + 25;
private struct RECT { public int left, top, right, bottom; }
[DllImport("user32.dll", EntryPoint = "SendMessageW")]
private static extern IntPtr SendMessageRect(IntPtr hWnd, int msg, IntPtr wp, ref RECT lp);
}
Here is a sample usage in a form, it draws a line from the first tick mark to the slider pointer:
private void myTrackBar1_ValueChanged(object sender, EventArgs e) {
this.Invalidate();
}
protected override void OnPaint(PaintEventArgs e) {
var chan = this.RectangleToClient(myTrackBar1.RectangleToScreen(myTrackBar1.Channel));
var slider = this.RectangleToClient(myTrackBar1.RectangleToScreen(myTrackBar1.Slider));
e.Graphics.DrawLine(Pens.Black, chan.Left + slider.Width / 2, myTrackBar1.Bottom + 5,
slider.Left + slider.Width / 2, myTrackBar1.Bottom + 5);
}