问题描述
我有一个textbox类，可以很好地与a，b，c等较宽的字符配合使用，但是对于像'f'和'l'这样的字符，它似乎错误地获得了这些字符的大小，但正确地获得了其他尺寸？这是用于textbox类的文本的“突出显示”代码，稍后会对其进行修正，但是应该对其进行记录以易于理解。
void Textbox::Highlight_Text(SDL_Renderer *renderer)
{
if (clickedOn == true){
int currentCharacterWidth = 0;
int currentCharacterHeight = 0;
int totalSize = 0;
SDL_Rect currentCharacterRect;
string currentCharacter,tempText;
if (highlightedCharacters.size() >= 1){ ///To make sure only 1 thing is highlighted,in conjunction with next part
highlighted = true;
}
if (highlighted == true){ /// if a part is highlighted,and is left highlighted,next time clicked,remove the highlighting and redo it
if (EVENTS.mouseClicked == false){
resetHighlightingNextClick = true;
}
}
if (resetHighlightingNextClick == true){
if (highlighted == true){
if (EVENTS.mouseClicked == true){ ///actually remove the highlighting
highlightedCharacters.clear();
indexOfCharactersHighlighted.clear();
highlighted = false;
resetHighlightingNextClick = false;
}
}
}
for (int i=0; i < textboxText.Get_Text().size(); i++){
currentCharacter = textboxText.Get_Text()[i];
TTF_SizeText(textboxText.fonts[textboxText.fontIndex],currentCharacter.c_str(),¤tCharacterWidth,¤tCharacterHeight);
///the totalSize added to rectangle is not making it wider,its adjusting its x value offset
currentCharacterRect = {textboxText.x + totalSize,textboxText.y + int(textboxText.textSize*0.1),currentCharacterWidth,currentCharacterHeight};
totalSize += currentCharacterWidth; ///"current" size of text in loop to get x value of specific character clicked on
///If mouse is touching any of the characters in the text
if ( SDL_PointInRect(&EVENTS.mousePos,¤tCharacterRect) ){
EVENTS.Change_Cursor(SDL_SYSTEM_CURSOR_IBEAM);
if (EVENTS.mouseClicked == true){ ///Clicking on the text to highlight
if (In_Array(highlightedCharacters,currentCharacterRect.x) == false ){
highlightedCharacters.push_back(currentCharacterRect); ///If there is no duplicates
indexOfCharactersHighlighted.push_back(i); ///Get index of text being highlighted,its always in order too
}
if ( currentCharacterRect.x != highlightedCharacters[highlightedCharacters.size()-1].x){ ///So they don't stack up highlights,ie,you can remove them
/// If the mouse is not highlighting the last one,say second last on the right for example,delete the one in front of it (last one)
///Like when highlighting text with mouse,it adapts to how you move it,so it unhighlights text not being highlighted
highlightedCharacters.pop_back();
indexOfCharactersHighlighted.pop_back();
}
}
}
}///End for loop
if (highlighted == true ){
if (EVENTS.backspacePressed == true || EVENTS.currentKey != ""){
tempText = textboxText.Get_Text();
///remove highlighted characters
if (indexOfCharactersHighlighted.size() != 0){
///the range of values highlighted will always be in a sorted order
tempText.erase( Min(indexOfCharactersHighlighted),Max(indexOfCharactersHighlighted)-Min(indexOfCharactersHighlighted)+1 ); ///erase the range of values highlighted
textboxText.Change_Text(renderer,tempText);
///once removed text,clear every highlighted related thing
highlightedCharacters.clear();
indexOfCharactersHighlighted.clear();
highlighted = false;
resetHighlightingNextClick = false;
EVENTS.backspacePressed = false;
EVENTS.currentKey = "";
}
}
}
} ///End if for clicked on
///fit with scrolling offsets
if (EVENTS.scrolled == true){
for (int p=0; p < highlightedCharacters.size(); p++){
highlightedCharacters[p].y += EVENTS.scrollVal;
}
}
///Drawing the highlighted text
if (highlighted == true && clickedOn == true){
SDL_SetRenderDrawBlendMode(renderer,SDL_BLENDMODE_BLEND);
SDL_SetRenderDrawColor(renderer,55,60,65,75);
for (int j=0; j < highlightedCharacters.size(); j++){
SDL_RenderFillRect(renderer,&highlightedCharacters[j]);
}
SDL_SetRenderDrawBlendMode(renderer,SDL_BLENDMODE_NONE);
}
///when clicked off textbox,clear everything/highlighting
if (clickedOn == false){
highlightedCharacters.clear();
indexOfCharactersHighlighted.clear();
highlighted = false;
}
}
要以传入的字体作为参考，这是我在文本类中获取它的方式
fontIndex = textSize-lowestFontSize -1;
///One time setups
if (numOfInstances == 1){
try{
TTF_Init();
//cout << "Initialised ttf" << endl;
}
catch (exception &err){
cout << "Could not initialise ttf for text \"" << text << "\". Error from SDL is: " << TTF_GetError() << ". Error from C++ is: " << err.what() << endl;
}
for (int i=lowestFontSize; i <= highestFontSize; i++){
TTF_Font *currentFont = TTF_OpenFont(fontType.c_str(),i);
if (!currentFont){
cout << "Error with font in text \"" << txt << "\" Error is: " << SDL_GetError() << endl;
}
fonts.push_back(currentFont);
}
}
，所以如果我传入，例如说25作为我的文本大小，则我有我的lowestFontSize = 10和highestFontSize = 100，所以我需要25号的索引是（25-10 -1 = 14）从0开始，这是我在文本类中创建字体的静态向量之前的第一行。这是我要解释的摘录：
这显然可以正常工作。
但是现在，这是完全不准确的。如果我在文本末尾选择了一个随机字符，则该字符没有正确突出显示，只是从头开始看起来就很完美，但随后看起来好像不准确了，因此使总的灰色突出显示范围更宽了比预期的要好。
解决方法
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