我目前有一个QSlider,可以使用鼠标滚动图像数据帧。我希望能够使用箭头键滚动单步(一帧)。
这是我当前的sliderMoved代码:
def sliderMoved(self,val):
"""
retrieves the data array for the index value specified by the slider
"""
if self.fileheader is None:
print "[DEBUG] change_image_index(): self.fileheader is None"
return
idx=val
self.x=idx
frame=self.fileheader.frameAtIndex(idx)
image=scipy.ndimage.filters.maximum_filter(frame.data, size=5)
self.image.setImage(image, scale=((10.28/512),(2.486/96)))
print self.image.imageItem.pixelSize()
def keyPressEvent(self, event):
if event.key()==Qt.Key_Right:
frame=self.fileheader.frameAtIndex(idx+1)
要将滑块连接到事件,我只需使用:
self.slider.sliderMoved.connect(self.sliderMoved)
self.slider.sliderMoved.connect(self.keyPressEvent)
箭头键移动滑块,但它不会导致图像跳过帧...我知道我在这里遗漏了一些傻事......
答案 0 :(得分:6)
尝试连接滑块的valueChanged
而不是sliderMoved
。
import sys
from PyQt4.QtCore import Qt
from PyQt4.QtGui import QApplication, QWidget, QSlider, QLabel, QVBoxLayout
class Widget(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.v_layout = QVBoxLayout()
self.slider = QSlider()
self.slider.setOrientation(Qt.Horizontal)
self.label = QLabel('Slider at position 0')
self.v_layout.addWidget(self.label)
self.v_layout.addWidget(self.slider)
self.setLayout(self.v_layout)
self.slider.valueChanged.connect(self.slider_moved)
def keyPressEvent(self, event):
if event.key()==Qt.Key_Right:
self.slider.setValue(self.slider.value() + 1)
elif event.key()==Qt.Key_Left:
self.slider.setValue(self.slider.value() - 1)
else:
QWidget.keyPressEvent(self, event)
def slider_moved(self, position):
self.label.setText('Slider at position %d' % position)
if __name__ == '__main__':
app = QApplication(sys.argv)
widget = Widget()
widget.show()
sys.exit(app.exec_())
从您的keyPressEvent
,您只需更改滑块的值,这将导致连接到valueChanged
的任何功能运行。