I am getting text from CEdit control. I need to imitate the same text on image. The edit control is multiline, so when I keep on typing long string the remaining part of the word goes to the next line.
I am not getting at which text index in the CEdit the character goes on the next line.
So while trying to do this, I am able to insert "\r\n" if the width of line exceed the width of the rect. But the problem is if the alignment is center the the character after the inserted "\r\n" is treated as new word by the DrawText api and purpose of the above insertion of new-line character fails.
Can someone let me know, Is there some way I can know where the line is breaking in CEdit or alternative for the same.
CString strTempFormattedText(_T(""));
LONG tempTotalWidth = 0;
for(int i = 0; i < myText.GetLength(); i++) {
TCHAR tempChar = myText.GetAt(i);
tempTotalWidth += pDC->GetTextExtent(CString(tempChar), 1).cx;
if(tempTotalWidth >= rc.Width()) {
tempTotalWidth = 0;
strTempFormattedText.Append(_T("\n\r"));
}
strTempFormattedText.AppendChar(tempChar);
}
myText = strTempFormattedText;
switch(ALIGNMENT)
{
case RIGHT:
pDC->DrawText(myText, -1, rc, DT_WORDBREAK | DT_RIGHT );
break;
case CENTER:
pDC->DrawText(myText, -1, rc, DT_WORDBREAK | DT_CENTER);
break;
case LEFT:
pDC->DrawText(myText, -1, rc, DT_WORDBREAK | DT_LEFT);
break;
}
Thanks
I think you should combine LineIndex, LineLength and PosFromChar to solve your problem. Using the API instead of the data could be useful if you will need access the more complex CRichEditText.
Related
i am trying to set maximum length in string value and put '..' instead of removed chrs like following
String myValue = 'Welcome'
now i need the maximum length is 4 so output like following
'welc..'
how can i handle this ? thanks
The short and incorrect version is:
String abbrevBad(String input, int maxlength) {
if (input.length <= maxLength) return input;
return input.substring(0, maxLength - 2) + "..";
}
(Using .. is not the typographical way to mark an elision. That takes ..., the "ellipsis" symbol.)
A more internationally aware version would count grapheme clusters instead of code units, so it handles complex characters and emojis as a single character, and doesn't break in the middle of one. Might also use the proper ellipsis character.
String abbreviate(String input, int maxLength) {
var it = input.characters.iterator;
for (var i = 0; i <= maxLength; i++) {
if (!it.expandNext()) return input;
}
it.dropLast(2);
return "${it.current}\u2026";
}
That also works for characters which are not single code units:
void main() {
print(abbreviate("argelbargle", 7)); // argelbβ¦
print(abbreviate("π©π°π©π°π©π°π©π°π©π°", 4)); // π©π°π©π°π©π°β¦
}
(If you want to use ... instead of β¦, just change .dropLast(2) to .dropLast(4) and "β¦" to "...".)
You need to use RichText and you need to specify the overflow type, just like this:
Flexible(
child: RichText("Very, very, very looong text",
overflow: TextOverflow.ellipsis,
),
);
If the Text widget overflows, some points (...) will appears.
In Flutter, after a Paragraph or TextPainter has laid out it's text, you can get the Rects for the lines (or runs within a line) by calling getBoxesForSelection. If you draw the actual boxes they look something like this:
How do I programmatically get the text within each TextBox?
I wish there were a better way, but this is the only way I have found so far:
// The TextPaint has already been laid out
// select everything
TextSelection selection = TextSelection(baseOffset: 0, extentOffset: textSpan.text.length);
// get a list of TextBoxes (Rects)
List<TextBox> boxes = _textPainter.getBoxesForSelection(selection);
// Loop through each text box
List<String> lineTexts = [];
int start = 0;
int end;
int index = -1;
for (TextBox box in boxes) {
index += 1;
// Uncomment this if you want to only get the whole line of text
// (sometimes a single line may have multiple TextBoxes)
// if (box.left != 0.0)
// continue;
if (index == 0)
continue;
// Go one logical pixel within the box and get the position
// of the character in the string.
end = _textPainter.getPositionForOffset(Offset(box.left + 1, box.top + 1)).offset;
// add the substring to the list of lines
final line = rawText.substring(start, end);
lineTexts.add(line);
start = end;
}
// get the last substring
final extra = rawText.substring(start);
lineTexts.add(extra);
Notes:
To be more rebust, this should check the TextPosition affinity.
This doesn't handle right-to-left text yet.
Update:
If you are getting the text of the whole line, you can use LineMetrics (from TextPainter.computeLineMetrics()) now instead of TextBox. The process would be similar.
I am Persian and j2me do not have good support for persian font.
I will create a native font library that get bitmap font and paint my persian text in desplay. But I have a problem.
In english each letter is a set consist shap and uncode. Like (a , U+0061)
But in persian a char may have several shape. for example letter 'Ψ¨' in persian alphabet can be:
Ψ’Ψ¨ --when it is separate letter in a word
Ψ¨Ω --when it is start letter in a word
...
How can I get other form of a letter from font file?
I am a persian developer and I had the same problem in about 4 years ago.You have some way to solve this problem:
1-using custom fonts.
2-reshape your text before display it.
A good article in about first,is "MIDP Terminal Emulation, Part 3: Custom Fonts for MIDP ".But for arabic letters I think that is not simple.
In about second way,say you would to replace any character in your text with correct character.This means when you have:
String str = "Ψ¨Ω";
If get str characters they will be look like:
{1576,1607} that is like "Ψ¨ Ω" instead of "Ψ¨Ω".So you would to replace incorrect Unicode with correct Unicode codes(in this case correct characters are: {65169, 65258}).You can use "Arabic Reshapers" even reshapers that designed for android!I saw 2 link for this reshapers:1-github 2-Arabic Android(I'm persian developer and so I do not try them,instead I create classes with the same idea as they have).
With using a good reshaper also you may have problem with character arranging from left to right instead of right to left.(some phones draw characters from left to right and other from right to left).I use below class to detect that ordering is true(from right to left) or not:
public class DetectOrdering{
public static boolean hasTrueOrdering()
{
boolean b = false;
try {
char[] chArr = {65169, 65258};
String str = new String(chArr);
System.out.println(str);
int width = f1.charWidth(chArr[1]) / 2;
int height = f1.getHeight();
image1 = Image.createImage(width, height);
image2 = Image.createImage(width, height);
Graphics g1 = image1.getGraphics();
Graphics g2 = image2.getGraphics();
g1.drawString(str, 0, 0, 0);
g2.drawChar(chArr[1], 0, 0, 0);
int[] im1 = new int[width * height];
int[] im2 = new int[width * height];
image1.getRGB(im1, 0, width, 0, 0, width, height);
image2.getRGB(im2, 0, width, 0, 0, width, height);
if (areEqualIntArrrays(im1, im2)) {
b = true;
} else {
b = false;
}
} catch (Exception e) {
e.printStackTrace();
}
return b;
}
private static boolean areEqualIntArrrays(int[] i1, int[] i2) {
if (i1.length != i2.length) {
return false;
} else {
for (int i = 0; i < i1.length; i++) {
if (i1[i] != i2[i]) {
return false;
}
}
}
return true;
}
}
If DetectOrdering.hasTrueOrdering() returns true,sure that phone draw Arabic characters from right to left and display your String.If returns false it draws from left to right.If phone draws Arabic character from left to right you would to reverse string after reshape it and then you can display it.
You can use one alphabet.png for the direct unicode mappings (those where the persian char does not change because of the neighbor chars). If your characters are monospaced, you may start with below class, as seen at http://smallandadaptive.blogspot.com.br/2008/12/custom-monospaced-font.html:
public class MonospacedFont {
private Image image;
private char firstChar;
private int numChars;
private int charWidth;
public MonospacedFont(Image image, char firstChar, int numChars) {
if (image == null) {
throw new IllegalArgumentException("image == null");
}
// the first visible Unicode character is '!' (value 33)
if (firstChar <= 33) {
throw new IllegalArgumentException("firstChar <= 33");
}
// there must be at lease one character on the image
if (numChars <= 0) {
throw new IllegalArgumentException("numChars <= 0");
}
this.image = image;
this.firstChar = firstChar;
this.numChars = numChars;
this.charWidth = image.getWidth() / this.numChars;
}
public void drawString(Graphics g, String text, int x, int y) {
// store current Graphics clip area to restore later
int clipX = g.getClipX();
int clipY = g.getClipY();
int clipWidth = g.getClipWidth();
int clipHeight = g.getClipHeight();
char[] chars = text.toCharArray();
for (int i = 0; i < chars.length; i++) {
int charIndex = chars[i] - this.firstChar;
// current char exists on the image
if (charIndex >= 0 && charIndex <= this.numChars) {
g.setClip(x, y, this.charWidth, this.image.getHeight());
g.drawImage(image, x - (charIndex * this.charWidth), y,
Graphics.TOP | Graphics.LEFT);
x += this.charWidth;
}
}
// restore initial clip area
g.setClip(clipX, clipY, clipWidth, clipHeight);
}
}
And change it to use a different char_uxxxx.png file for each persian char that changes because of the neighbor chars.
When parsing your string, before painting, you must check which png file is appropriate to use. Hope this is a good place to start.
I am taking the URL value from DocumentComplete and try to copy it to testDest[256]
Here is my code:
char *p= _com_util::ConvertBSTRToString(url->bstrVal);
for (int i = 0; i <= strlen(p); i++)
{
testDest[i] = p[i];
}
My question is, how can I print the testDest value on a messagebox?
The simplest way to create a message box is this:
MessageBox(NULL, testDest, "some title", 0);
If you already have a window and you want to associate the message box with that window, just change the first parameter from NULL to the window handle.
Also, if you're using Unicode, you should convert your char [] to TCHAR [] or otherwise call the ANSI version (MessageBoxA) explicitly.
You can do this
CString cstring( testDest);
AfxMessageBox(testDest);
I've got a little text drawing puzzle under Win32. I'm trying to draw some instructions for users of my application at the top of the window.
Please refer to the following window (I've changed the background color on the text so you can see the boundaries)
(source: billy-oneal.com)
I'm currently using DrawTextEx to draw the text to my window, but the problem is that it does not fill the entire RECTangle that I give it. Not drawing that area is just fine, until the window resizes:
(source: billy-oneal.com)
When the text is re wrapped due to the window sizing, because DrawTextEx doesn't clear it's background, these artifacts are leftover.
I tried using FillRect to fill in the area behind the text drawing call, which does eliminate the visual artifacts, but then causes the text to flicker constantly, as it is completely erased and then completely redrawn to the display.
Any ideas on how one might get the area not containing text to be drawn with the background color?
EDIT: I'd like to avoid having to double buffer the form if at app possible.
EDIT2: I solved the problem by only redrawing the text when I detect that the wrapping changes during a resize.
Use double buffering?
Draw everything to a bitmap and draw the bitmap to the window. Flickering is commonly a double buffering issue.
There are many possible solutions and without seeing your code, it's hard to tell which method would be best so I'd suggest taking a look at this article on flicker free drawing
SetBkMode + SetBkColor ?
Well since nobody seems to know what to do about it, I implemented it this way:
std::vector<std::wstring> wrapString(HDC hDC, const std::wstring& text, const RECT& targetRect, HFONT font)
{
std::vector<std::wstring> result;
RECT targetRectangle;
CopyRect(&targetRectangle, &targetRect);
//Calculate the width of the bounding rectangle.
int maxWidth = targetRectangle.right - targetRectangle.left;
//Draw the lines one at a time
std::wstring currentLine;
for(std::wstring::const_iterator it = text.begin(); it != text.end(); currentLine.push_back(*it), it++)
{
if(*it == L'\r' || *it == L'\n')
{ //Hard return
while(it != text.end() && (*it == L'\r' || *it == L'\n')) it++;
result.push_back(currentLine);
currentLine.clear();
}
else
{ //Check for soft return
SIZE sizeStruct;
GetTextExtentPoint32(hDC, currentLine.c_str(), static_cast<int>(currentLine.length()), &sizeStruct);
if (sizeStruct.cx > maxWidth)
{
std::wstring::size_type lineLength = currentLine.find_last_of(L' ');
if (lineLength == currentLine.npos)
{ //Word is longer than a line.
for(;it != text.end() && !iswspace(*it);it++) currentLine.push_back(*it);
}
else
{ //Clip word to line.
//Backtrack our scan of the source text.
it -= currentLine.length() - lineLength - 1;
//Remove the clipped word
currentLine.erase(lineLength);
}
result.push_back(currentLine);
currentLine.clear();
}
}
}
//Last remaining text.
result.push_back(currentLine);
return result;
}
void DrawInstructionsWithFilledBackground(HDC hDC, const std::wstring& text, RECT& targetRectangle, HFONT font, COLORREF backgroundColor)
{
//Set up our background color.
int dcIdx = SaveDC(hDC);
HBRUSH backgroundBrush = CreateSolidBrush(backgroundColor);
SelectObject(hDC, backgroundBrush);
SelectObject(hDC, font);
SetBkColor(hDC, backgroundColor);
std::vector<std::wstring> lines(wrapString(hDC, text, targetRectangle, font));
for(std::vector<std::wstring>::const_iterator it = lines.begin(); it!=lines.end(); it++)
{
RECT backgroundRect = targetRectangle;
DrawText(hDC, const_cast<LPWSTR>(it->c_str()), static_cast<int>(it->length()), &backgroundRect, DT_CALCRECT | DT_NOCLIP | DT_SINGLELINE);
backgroundRect.left = backgroundRect.right;
backgroundRect.right = targetRectangle.right;
if (backgroundRect.right >= backgroundRect.left)
FillRect(hDC, &backgroundRect, backgroundBrush);
ExtTextOut(hDC, targetRectangle.left, targetRectangle.top, ETO_OPAQUE, NULL, it->c_str(), static_cast<UINT>(it->length()), NULL);
targetRectangle.top += backgroundRect.bottom - backgroundRect.top;
}
instructionsWrap = lines;
//Restore the DC to it's former glory.
RestoreDC(hDC, dcIdx);
DeleteObject(backgroundBrush);
}
Get/Calculate the rect used by the DrawText call and clip it with something like ExcludeClipRect before calling FillRect