wxpython - 如何无闪烁地调整图像大小？
我刚接触wxPython和图形用户界面（GUI）。现在我的应用程序只显示了一个工具栏、状态栏和一个面板。这个面板里有一个盒子布局，里面放着一个静态图片。我想让这个图片在窗口大小改变时自动调整大小，以适应它的容器，但我遇到了很多闪烁的问题。
总结
当窗口大小改变时，会调用resizeImage()（EVT_SIZE事件触发）
resizeImage()会调整面板的大小以适应新的尺寸，然后通过scaleImage()来缩放图片，并把它放到静态图片中。
resizeImage()的基本功能是获取图片对象，调整它的大小，把它设置为位图，然后将其设置为静态图片以供显示。
代码
class Canvas(wx.Panel):
"""Panel used to display selected images"""
#---------------------------------------------------------------------------
def __init__(self, parent):
"""Constructor"""
wx.Panel.__init__(self, parent)
# Globals
self.image = wx.EmptyImage(1,1)
self.control = wx.StaticBitmap(self, wx.ID_ANY,
wx.BitmapFromImage(self.image))
self.background = wx.BLACK
self.padding = 5
self.imageList = []
self.current = 0
self.total = 0
# Register Events
Publisher().subscribe(self.onLoadDirectory, ("load directory"))
Publisher().subscribe(self.resizeImage, ("resize window"))
# Set Layout
self.mainSizer = wx.BoxSizer(wx.VERTICAL)
self.mainSizer.Add(self.control, 1, wx.ALL|wx.CENTER|wx.EXPAND,
self.padding)
self.SetSizer(self.mainSizer)
self.SetBackgroundColour(self.background)
#---------------------------------------------------------------------------
def scaleImage(self, image, maxWidth, maxHeight):
"""asd"""
width = image.GetWidth()
height = image.GetHeight()
ratio = min( maxWidth / width, maxHeight/ height );
image = image.Scale(ratio*width, ratio*height, wx.IMAGE_QUALITY_HIGH)
result = wx.BitmapFromImage(image)
return result
#---------------------------------------------------------------------------
def loadImage(self, image):
"""Load image"""
self.image = wx.Image(image, wx.BITMAP_TYPE_ANY)
bmp = wx.BitmapFromImage(self.image)
w, h = self.mainSizer.GetSize()
w = w - self.padding*2
h = h - self.padding*2
bmp = self.scaleImage(self.image, w, h)
self.control.SetBitmap(bmp)
#---------------------------------------------------------------------------
def getImageIndex(self, path):
"""Retrieve index of image from imagePaths"""
i = 0
for image in self.imagePaths:
if image == path:
return i
i += 1
return -1
#---------------------------------------------------------------------------
def resizeImage(self, event):
self.SetSize(event.data)
if self.total:
w = event.data[0] - self.padding*2
h = event.data[1] - self.padding*2
bmp = self.scaleImage(self.image, w, h)
self.control.SetBitmap(bmp)
#---------------------------------------------------------------------------
def onLoadDirectory(self, event):
"""Load the image and compile a list of image files from directory"""
self.folderPath = os.path.dirname(event.data)
self.imagePaths = glob.glob(self.folderPath + "\\*.jpg")
self.total = len(self.imagePaths)
self.current = self.getImageIndex(event.data)
self.SetSize(self.GetSize())
self.loadImage(self.imagePaths[self.current])
2 个回答
1
在你的resizeImage方法中，添加一个“冻结”和一个“解冻”可能会有帮助，像这样：
def resizeImage(self, event):
self.SetSize(event.data)
if self.total:
w = event.data[0] - self.padding*2
h = event.data[1] - self.padding*2
self.Freeze()
bmp = self.scaleImage(self.image, w, h)
self.control.SetBitmap(bmp)
self.Thaw()