horizontal scrolling

src/new_big_text/bigger_text.py

@@ -10,8 +10,8 @@ from typing import List
 
 from PySide6 import QtCore, QtGui
 from PySide6.QtGui import QPaintEvent, QPainter, QFont, QFontMetrics, QColor, QBrush, QWheelEvent
-from PySide6.QtWidgets import QApplication, QMainWindow, QWidget, QStatusBar
+from PySide6.QtWidgets import QApplication, QMainWindow, QWidget, QStatusBar, QGridLayout, QSizePolicy, QScrollBar
-from PySide6.QtCore import QTimer, QPoint, Qt, QRect, QLine
+from PySide6.QtCore import QTimer, QPoint, Qt, QRect, QLine, Slot
 import sys
 from src.pluginregistry import PluginRegistry
 import gettext
@@ -19,6 +19,8 @@ import gettext
 __version__ = '0.2.1'
 
 from src.i18n import _
+from src.ui.bigtext.BigScrollBar import BigScrollBar
+from src.ui.bigtext.bigtext import InnerBigText
 
 gettext.install('krowlog', 'locale')
 
@@ -73,7 +75,7 @@ class MainWindow(QMainWindow):
         self.setWindowTitle(_("KrowLog"))
         self.setMinimumWidth(800)
         self.setMinimumHeight(880)
-        bigger_text = BiggerText()
+        bigger_text = BiggerText(FileModel("testdata/testset.txt"))
         self.setCentralWidget(bigger_text)
         self.status_bar = QStatusBar(self)
         self.setStatusBar(self.status_bar)
@@ -240,17 +242,53 @@ class Selection:
     def max_byte(self) -> int:
         return max(self.start.pos(), self.end.pos())
 
-class BiggerText(QWidget):
 
-    def __init__(self, ):
+class BiggerText(QWidget):
+    def __init__(self, model: FileModel):
         super(BiggerText, self).__init__()
 
+        self._model = model
+        self.grid = QGridLayout()
+        self.grid.setContentsMargins(0, 0, 0, 0)
+        self.grid.setHorizontalSpacing(0)
+        self.grid.setVerticalSpacing(0)
+        self.setLayout(self.grid)
+
+        self.v_scroll_bar = BigScrollBar()
+
+        self.big_text_area = BiggerTextArea(self, model, self.v_scroll_bar)
+        self.big_text_area.setSizePolicy(QSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding))
+
+        self.h_scroll_bar = QScrollBar(Qt.Orientation.Horizontal)
+        self.h_scroll_bar.setMinimum(0)
+        self.h_scroll_bar.setMaximum(1)
+        self.h_scroll_bar.valueChanged.connect(self.big_text_area.h_scroll_event)
+
+        # self.v_scroll_bar.value_changed.connect(self.big_text_area.v_scroll_value_changed)
+        # self.v_scroll_bar.scroll_event.connect(self.big_text_area.v_scroll_event)
+
+        self.grid.addWidget(self.big_text_area, 0, 1)
+        self.grid.addWidget(self.h_scroll_bar, 1, 1)
+        self.grid.addWidget(self.v_scroll_bar, 0, 2)
+
+
+class BiggerTextArea(QWidget):
+
+    def __init__(self, parent: BiggerText, model: FileModel, v_scroll_bar: BigScrollBar):
+        super(BiggerTextArea, self).__init__()
+        self.parent = parent
+
+        self._v_scroll_bar = v_scroll_bar
+
+        self._left_offset = 0
+        self.longest_line = 1
+
         self._font_size = 20
         self.selection = Selection()
         self.mouse_pressed = False
 
         self._encoding = "utf8"
-        self.file_model: FileModel = FileModel("testdata/testset.txt")
+        self.file_model: FileModel = model
 
         # font ="Andale Mono"
         # font = "JetBrains Mono"
@@ -288,6 +326,12 @@ class BiggerText(QWidget):
             # print("wheel event fired :) %s" % (direction))
             self.scroll_by_lines(direction * 3)
 
+    @Slot()
+    def h_scroll_event(self, left_offset: int):
+        self._left_offset = left_offset
+        # print("left_offset: %d" % left_offset)
+        self.update()
+
     def to_byte_offset(self, pos: QPoint) -> SelectionPos:
 
         line_number = self.y_pos_to_line_number_on_screen(pos.y())
@@ -327,6 +371,17 @@ class BiggerText(QWidget):
     def y_pos_to_line_number_on_screen(self, y: int) -> int:
         return int(y / self.char_height)
 
+    def update_longest_line(self, lines: [Line]):
+
+        for line in lines:
+            width_for_full_line = self.font_metric.horizontalAdvance(line.text())
+            # print("width_in_chars: %d" % width_in_chars)
+            if self.longest_line < width_for_full_line:
+                self.longest_line = width_for_full_line
+
+        maximum = max(0, self.longest_line - self.width() + 1)
+        self.parent.h_scroll_bar.setMaximum(round(maximum))
+
     def paintEvent(self, event: QPaintEvent) -> None:
         start_ns = time.process_time_ns()
         painter = QPainter(self)
@@ -341,6 +396,8 @@ class BiggerText(QWidget):
 
         self.lines_to_render: [Line] = self.file_model.read(0, lines_to_read, 200, self._encoding)
 
+        self.update_longest_line(self.lines_to_render)
+
         painter.setPen(QColor(0, 0, 0))
 
         line_on_screen = 1
@@ -379,13 +436,14 @@ class BiggerText(QWidget):
                 painter.setPen(QColor(0, 0, 0, 0))
 
                 painter.drawRect(
-                    QRect(x_start, int(line_on_screen * self.char_height + int(self.char_height * 0.1)), x_end,
+                    QRect(x_start - self._left_offset,
+                          int(line_on_screen * self.char_height + int(self.char_height * 0.1)), x_end,
                           -self.char_height))
 
                 painter.setBrush(prev_brush)
                 painter.setPen(prev_pen)
 
-            painter.drawText(QPoint(0, line_on_screen * self.char_height), line.text())
+            painter.drawText(QPoint(-self._left_offset, line_on_screen * self.char_height), line.text())
             line_on_screen = line_on_screen + 1
 
         painter.end()