Welcome folks today in this blog post we will be looking at wxpython image viewer or preview. All the full source code of the application is given below.

Get Started

In order to get started you need to install the below library using the pip command as shown below

pip install wxpython

After installing this library you need to make an app.py file and copy paste the following code

app.py

import os
import wx

class PhotoCtrl(wx.App):
    def __init__(self, redirect=False, filename=None):
        wx.App.__init__(self, redirect, filename)
        self.frame = wx.Frame(None, title='Photo Control')
                          
        self.panel = wx.Panel(self.frame)

        self.PhotoMaxSize = 240
        
        self.createWidgets()
        self.frame.Show()
        
    def createWidgets(self):
        instructions = 'Browse for an image'
        img = wx.EmptyImage(240,240)
        self.imageCtrl = wx.StaticBitmap(self.panel, wx.ID_ANY, 
                                         wx.BitmapFromImage(img))
        
        instructLbl = wx.StaticText(self.panel, label=instructions)
        self.photoTxt = wx.TextCtrl(self.panel, size=(200,-1))
        browseBtn = wx.Button(self.panel, label='Browse')
        browseBtn.Bind(wx.EVT_BUTTON, self.onBrowse)
        
        self.mainSizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer = wx.BoxSizer(wx.HORIZONTAL)
        
        self.mainSizer.Add(wx.StaticLine(self.panel, wx.ID_ANY),
                           0, wx.ALL|wx.EXPAND, 5)
        self.mainSizer.Add(instructLbl, 0, wx.ALL, 5)
        self.mainSizer.Add(self.imageCtrl, 0, wx.ALL, 5)
        self.sizer.Add(self.photoTxt, 0, wx.ALL, 5)
        self.sizer.Add(browseBtn, 0, wx.ALL, 5)        
        self.mainSizer.Add(self.sizer, 0, wx.ALL, 5)
        
        self.panel.SetSizer(self.mainSizer)
        self.mainSizer.Fit(self.frame)

        self.panel.Layout()
        
    def onBrowse(self, event):
        """ 
        Browse for file
        """
        wildcard = "JPEG files (*.jpg)|*.jpg"
        dialog = wx.FileDialog(None, "Choose a file",
                               wildcard=wildcard,
                               style=wx.FD_OPEN)
        if dialog.ShowModal() == wx.ID_OK:
            self.photoTxt.SetValue(dialog.GetPath())
        dialog.Destroy() 
        self.onView()

    def onView(self):
        filepath = self.photoTxt.GetValue()
        img = wx.Image(filepath, wx.BITMAP_TYPE_ANY)
        # scale the image, preserving the aspect ratio
        W = img.GetWidth()
        H = img.GetHeight()
        if W > H:
            NewW = self.PhotoMaxSize
            NewH = self.PhotoMaxSize * H / W
        else:
            NewH = self.PhotoMaxSize
            NewW = self.PhotoMaxSize * W / H
        img = img.Scale(NewW,NewH)

        self.imageCtrl.SetBitmap(wx.BitmapFromImage(img))
        self.panel.Refresh()
        
if __name__ == '__main__':
    app = PhotoCtrl()
    app.MainLoop()

If you execute the above python script by typing the below command

python app.py