[view feature] rendering all package images | replacing Cache thread lock by process lock

bauh/view/qt/screenshots.py

@@ -1,9 +1,10 @@
 from typing import List
 
 from PyQt5.QtGui import QIcon, QPixmap
-from PyQt5.QtWidgets import QDialog, QLabel, QVBoxLayout
+from PyQt5.QtWidgets import QDialog, QLabel, QGridLayout, QPushButton
 
 from bauh.api.abstract.cache import MemoryCache
+from bauh.view.qt import qt_utils
 from bauh.view.qt.view_model import PackageView
 
 
@@ -12,6 +13,9 @@ class ScreenshotsDialog(QDialog):
     def __init__(self, pkg: PackageView, icon_cache: MemoryCache, i18n: dict, screenshots: List[QPixmap]):
         super(ScreenshotsDialog, self).__init__()
         self.setWindowTitle(str(pkg))
+        self.screenshots = screenshots
+        self.resize(1280, 720)
+        self.i18n = i18n
 
         icon_data = icon_cache.get(pkg.model.icon_url)
 
@@ -20,11 +24,42 @@ class ScreenshotsDialog(QDialog):
         else:
             self.setWindowIcon(QIcon(pkg.model.get_type_icon_path()))
 
-        self.setLayout(QVBoxLayout())
+        self.grid = QGridLayout()
+        self.setLayout(self.grid)
+        self.bt_back = QPushButton(self.i18n['screenshots.bt_back.label'].capitalize())
+        self.bt_back.clicked.connect(self.back)
+        self.bt_next = QPushButton(self.i18n['screenshots.bt_next.label'].capitalize())
+        self.bt_next.clicked.connect(self.next)
 
-        if screenshots:
-            lb = QLabel()
-            lb.setPixmap(screenshots[0])
-            self.layout().addWidget(lb)
+        self.grid.addWidget(self.bt_back, 0, 0)
+        self.grid.addWidget(self.bt_next, 0, 2)
+
+        self.img = QLabel()
+        self.layout().addWidget(self.img, 1, 1)
+
+        self.idx = 0
+        self._load_img()
+
+    def _load_img(self):
+        pixmap = self.screenshots[self.idx]
+        self.img.setPixmap(pixmap)
+
+        if len(self.screenshots) == 1:
+            self.bt_back.setVisible(False)
+            self.bt_next.setVisible(False)
+        else:
+            self.bt_back.setVisible(self.idx != 0)
+            self.bt_next.setVisible(self.idx != len(self.screenshots) - 1)
 
         self.adjustSize()
+        qt_utils.centralize(self)
+
+    def back(self):
+        self.idx -= 1
+        self._load_img()
+
+    def next(self):
+        self.idx += 1
+        self._load_img()
+
+