demos/qtdemo/demotextitem.cpp

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  41
  42 #include "demotextitem.h"
  43 #include "colors.h"
  44
  45 DemoTextItem::DemoTextItem(const QString &text, const QFont &font, const QColor &textColor,
  46                            float textWidth, QGraphicsScene *scene, QGraphicsItem *parent, TYPE type, const QColor &bgColor)
  47                            : DemoItem(scene, parent)
  48 {
  49     this->type = type;
  50     this->text = text;
  51     this->font = font;
  52     this->textColor = textColor;
  53     this->bgColor = bgColor;
  54     this->textWidth = textWidth;
  55     this->noSubPixeling = true;
  56 }
  57
  58 void DemoTextItem::setText(const QString &text)
  59 {
  60     this->text = text;
  61     this->update();
  62 }
  63
  64 QImage *DemoTextItem::createImage(const QMatrix &matrix) const
  65 {
  66     if (this->type == DYNAMIC_TEXT)
  67         return 0;
  68
  69     float sx = qMin(matrix.m11(), matrix.m22());
  70     float sy = matrix.m22() < sx ? sx : matrix.m22();
  71
  72     QGraphicsTextItem textItem(0, 0);
  73     textItem.setHtml(this->text);
  74     textItem.setTextWidth(this->textWidth);
  75     textItem.setFont(this->font);
  76     textItem.setDefaultTextColor(this->textColor);
  77     textItem.document()->setDocumentMargin(2);
  78
  79     float w = textItem.boundingRect().width();
  80     float h = textItem.boundingRect().height();
  81     QImage *image = new QImage(int(w * sx), int(h * sy), QImage::Format_ARGB32_Premultiplied);
  82     image->fill(QColor(0, 0, 0, 0).rgba());
  83     QPainter painter(image);
  84     painter.scale(sx, sy);
  85     QStyleOptionGraphicsItem style;
  86     textItem.paint(&painter, &style, 0);
  87     return image;
  88 }
  89
  90
  91 void DemoTextItem::animationStarted(int)
  92 {
  93     this->noSubPixeling = false;
  94 }
  95
  96
  97 void DemoTextItem::animationStopped(int)
  98 {
  99     this->noSubPixeling = true;
 100 }
 101
 102 QRectF DemoTextItem::boundingRect() const
 103
 104 {
 105     if (this->type == STATIC_TEXT)
 106         return DemoItem::boundingRect();
 107     return QRectF(0, 0, 50, 20); // Sorry for using magic number
 108 }
 109
 110
 111 void DemoTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 112 {
 113     Q_UNUSED(option);
 114     Q_UNUSED(widget);
 115
 116     if (this->type == STATIC_TEXT) {
 117         DemoItem::paint(painter, option, widget);
 118         return;
 119     }
 120
 121     painter->setPen(this->textColor);
 122     painter->drawText(0, 0, this->text);
 123 }