所以我试图为吉他效果程序制作一个gui。其中一个目标是让其他人设计svg“皮肤”来定制外观。我制作了继承每个小部件(即qdial)的小部件,并在初始化程序中将由皮肤指定的svg文件加载到qGraphicsSvgItem中。这是放入一个场景和一个视图,我适当地重载了调整大小和重新绘制。这工作。自定义外观svg QT中的GUI部件,性能非常差
当我将这些自定义svg窗口小部件(5个拨号,一个按钮和一个led)加载到父窗口小部件中时,cpu导轨和我的程序冻结。我是否完全用错误的方式来解决这个问题?我应该甚至使用QT吗?这似乎比试图用样式表做所有事情更容易(特别是我无法弄清楚如何改变拨号外观)。它会改进的东西离开小部件作为qGraphicsSvgItems并把他们都放到父窗口小部件的场景和视图?
这是一个实时信号处理程序,所以我不想在GUI中烧掉很多CPU。我试图做一些研究,但无法找到很多svg。我也没有在qtCreator中看到任何性能检查器,或者我会尝试查看瓶颈是什么。无论如何,如果我花更多时间尝试错误的做法,我会非常感谢您提供的任何建议。
非常感谢! _ssj71
p.s. 下面是一些代码(希望足够)的 的SVG插件:
#ifndef QSVGDIAL_H
#define QSVGDIAL_H
#include <QWidget>
#include <QDial>
#include <QtSvg/QSvgRenderer>
#include <QtSvg/QGraphicsSvgItem>
#include <QGraphicsView>
#include <QGraphicsScene>
class qSVGDial : public QDial
{
Q_OBJECT
public:
explicit qSVGDial(QWidget *parent = 0);
explicit qSVGDial(QString knobFile = "defaultKnob.svg", QString needleFile = "defaultNeedle.svg", QWidget *parent = 0);
~qSVGDial();
private:
void paintEvent(QPaintEvent *pe);
void resizeEvent(QResizeEvent *re);
float degPerPos;
float middle;
float mysize;
QGraphicsView view;
QGraphicsScene scene;
QGraphicsSvgItem *knob;
QGraphicsSvgItem *needle;
QSize k,n;
};
#endif // QSVGDIAL_H
的CPP:
#include "qsvgdial.h"
#include "math.h"
qSVGDial::qSVGDial(QWidget *parent) :
QDial(parent)
{
knob = new QGraphicsSvgItem("defaultKnob.svg");
needle = new QGraphicsSvgItem("defaultNeedle.svg");
view.setStyleSheet("background: transparent; border: none");
k = knob->renderer()->defaultSize();
n = needle->renderer()->defaultSize();
needle->setTransformOriginPoint(n.width()/2,n.height()/2);
knob->setTransformOriginPoint(k.width()/2,k.height()/2);
degPerPos = 340/(this->maximum() - this->minimum());
middle = (this->maximum() - this->minimum())/2;
mysize = k.width();
if (mysize<n.width()) mysize = n.width();
if (mysize<k.height()) mysize = k.height();
if (mysize<n.height()) mysize = n.height();
mysize = sqrt(2)*mysize;
view.setDisabled(true);
view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
scene.addItem(knob);
scene.addItem(needle);
view.setScene(&scene);
view.setParent(this,Qt::FramelessWindowHint);
}
qSVGDial::qSVGDial(QString knobFile, QString needleFile, QWidget *parent) :
QDial(parent)
{
knob = new QGraphicsSvgItem(knobFile);
needle = new QGraphicsSvgItem(needleFile);
view.setStyleSheet("background: transparent; border: none");
k = knob->renderer()->defaultSize();
n = needle->renderer()->defaultSize();
needle->setTransformOriginPoint(n.width()/2,n.height()/2);
knob->setTransformOriginPoint(k.width()/2,k.height()/2);
if (k!=n)
needle->setPos((k.width()-n.width())/2,(k.height()-n.height())/2);
degPerPos = 340/(this->maximum() - this->minimum());
middle = (this->maximum() - this->minimum())/2;
mysize = k.width();
if (mysize<n.width()) mysize = n.width();
if (mysize<k.height()) mysize = k.height();
if (mysize<n.height()) mysize = n.height();
mysize = sqrt(2)*mysize;
view.setDisabled(true);
view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
scene.addItem(knob);
scene.addItem(needle);
view.setScene(&scene);
view.setParent(this,Qt::FramelessWindowHint);
}
qSVGDial::~qSVGDial()
{
//delete ui;
}
void qSVGDial::paintEvent(QPaintEvent *pe)
{
needle->setRotation((this->sliderPosition() - middle)*degPerPos);
}
void qSVGDial::resizeEvent(QResizeEvent *re)
{
if (this->width()>this->height())
{
view.setFixedSize(this->height(),this->height());
view.move((this->width()-this->height())/2,0);
knob->setScale(this->height()/mysize);
needle->setScale(this->height()/mysize);
view.centerOn(knob);
}
else
{
view.setFixedSize(this->width(),this->width());
view.move(0,(this->height()-this->width())/2);
knob->setScale(this->width()/mysize);
needle->setScale(this->width()/mysize);
view.centerOn(knob);
}
QDial::resizeEvent(re);
}
父标头:
#ifndef PEDAL_H
#define PEDAL_H
#include <QtGui/QWidget>
#include <QString>
#include <QtSvg/QSvgRenderer>
#include <QtSvg/QGraphicsSvgItem>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <skin.h>
#include <qsvgdial.h>
#include <qsvgbutton.h>
#include <qsvgled.h>
#include <qsvgslider.h>
class Pedal : public QWidget
{
Q_OBJECT
public:
explicit Pedal(QWidget *parent = 0);
explicit Pedal(QString boxFile, QWidget *parent = 0);
~Pedal();
int LoadSkin(skin skinfiles);
QWidget* AddControl(QString type, QString param, int x, int y, int w, int h, QString file1, QString file2, QString file3, QString file4);
private:
void resizeEvent(QResizeEvent *re);
QRect PedalPosition();
float myheight;
float mywidth;
float scale;
int effectNumber;
QGraphicsView view;
QGraphicsScene scene;
QGraphicsSvgItem *box;
QSize p;
QWidget* controls[20];
QRect ctrlPos[20];
int numControls;
};
#endif // PEDAL_H
父CPP
#include "pedal.h"
#include "math.h"
Pedal::Pedal(QWidget *parent)
: QWidget(parent)
{
numControls = 0;
box = new QGraphicsSvgItem("stompbox.svg");
view.setStyleSheet("background: transparent; border: none");
p = box->renderer()->defaultSize();
box->setTransformOriginPoint(p.width()/2,p.height()/2);
myheight = p.height();
mywidth = p.width();
view.setDisabled(true);
view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
scene.addItem(box);
view.setScene(&scene);
view.setParent(this,Qt::FramelessWindowHint);
}
Pedal::Pedal(QString boxFile, QWidget *parent) :
QWidget(parent)
{
numControls = 0;
box = new QGraphicsSvgItem(boxFile);
view.setStyleSheet("background: transparent; border: none");
p = box->renderer()->defaultSize();
box->setTransformOriginPoint(p.width()/2,p.height()/2);
myheight = p.height();
mywidth = p.width();
view.setDisabled(true);
view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
scene.addItem(box);
view.setScene(&scene);
view.setParent(this,Qt::FramelessWindowHint);
}
Pedal::~Pedal()
{
}
void Pedal::resizeEvent(QResizeEvent *re)
{
view.setFixedSize(this->width(),this->height());
//view.move((this->width()-this->height())/2,(this->width()-this->height())/2);
if (this->width()/mywidth>this->height()/myheight)
{
scale = this->height()/myheight;
}
else
{
scale = this->width()/mywidth;
}
box->setScale(scale);
view.centerOn(box);
//QWidget::resizeEvent(re);
QRect v = PedalPosition();
QRect cpos;
for(int i = 0; i<numControls; i++)
{
cpos = ctrlPos[i];
controls[i]->setGeometry(v.x()+cpos.x()*scale,v.y()+cpos.y()*scale,cpos.width()*scale,cpos.height()*scale);
}
}
QWidget* Pedal::AddControl(QString type, QString param, int x, int y, int w, int h, QString file1, QString file2, QString file3, QString file4)
{
QWidget* control;
if (type.toLower() == "dial")
{
if (!file2.isEmpty())
control = new qSVGDial(file1,file2,this);
else
control = new qSVGDial(this);
}
else if (type.toLower() == "button")
{
if (!file2.isEmpty())
control = new qSVGButton(file1,file2,this);
else if (!file1.isEmpty())
control = new qSVGButton(file1,this);
else
control = new qSVGButton(this);
}
else if (type.toLower() == "slider")
{
if (!file2.isEmpty())
control = new qSVGSlider(file1,file2,this);
else if (!file1.isEmpty())
control = new qSVGSlider(file1,this);
else
control = new qSVGSlider(this);
}
else if (type.toLower() == "led")
{
if (!file2.isEmpty())
control = new qSVGLED(file1,file2,this);
else
control = new qSVGLED(this);
}
control->setToolTip(param);
ctrlPos[numControls] = QRect(x,360-y-h,w,h);
controls[numControls] = control;
numControls++;
return control;
}
QRect Pedal::PedalPosition()
{
QRect mypos;
mypos.setWidth(mywidth*scale);
mypos.setHeight(myheight*scale);
mypos.setX((this->width()-mypos.width())/2);
mypos.setY((this->height()-mypos.height())/2);
return mypos;
}
终于测试主
#include <QtGui/QApplication>
#include "pedal.h"
#include <string.h>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Pedal w("skins/default/stompbox.svg",0);
w.AddControl("Dial" , "Level", 133, 295, 47, 47, "skins/default/blackKnob.svg", "skins/default/whiteNeedle.svg","","");
w.AddControl("Button", "On", 20, 21, 182, 111, "skins/default/blackButton.svg","","","");
w.AddControl("LED", "On", 106, 328, 11, 11, "skins/default/redLEDOff.svg", "skins/default/redLEDOn.svg","","");
w.AddControl("Dial", "Gain", 44, 295, 47, 47, "skins/default/blackKnob.svg", "skins/default/whiteNeedle.svg","","");
w.AddControl("Dial", "Low", 36, 244, 31, 31, "skins/default/blackKnob.svg", "skins/default/whiteNeedle.svg","","");
w.AddControl("Dial", "Mid", 98, 244, 31, 31, "skins/default/blackKnob.svg", "skins/default/whiteNeedle.svg","","");
w.AddControl("Dial", "High", 160, 244, 31, 31, "skins/default/blackKnob.svg", "skins/default/whiteNeedle.svg","","");
w.show();
return a.exec();
}
希望这可以帮助。正如你所看到的,我有一个QGraphicsViews层,每个层都有一个小部件。我怀疑现在这可能是最糟糕的做法,所以我不知道是否有人有更多的经验,然后我才朝坏的方向前进。在玩了更多它之后,当我有2个qSVGDial实例时,问题似乎就会发生。如果我加载其他组件的组合,它的工作正常。再次感谢大家!
没有看到你的代码,我们可以”告诉你是否做错了事。与位图类型格式相比,SVG的渲染成本更高,因此无论您使用哪种工具包,都需要付出代价。你确定你需要SVG吗? (我发现你看到这样的放缓令人惊讶。)至于“Qt最好”,请不要问这种主观问题 – Mat
对不起,我不是故意问这样的问题。我只是想知道是否有一些我不知道为此设计的库。我想我不需要,但我喜欢工作和可扩展性。 – user962342
'QDial :: paintEvent'没有被覆盖内部调用,是否正确? – Troubadour