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jpayne@68
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1 "Zoom a window to maximum height."
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2
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3 import re
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4 import sys
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5 import tkinter
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6
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7
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8 class WmInfoGatheringError(Exception):
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9 pass
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10
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11
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12 class ZoomHeight:
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13 # Cached values for maximized window dimensions, one for each set
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14 # of screen dimensions.
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15 _max_height_and_y_coords = {}
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16
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17 def __init__(self, editwin):
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18 self.editwin = editwin
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19 self.top = self.editwin.top
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20
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21 def zoom_height_event(self, event=None):
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22 zoomed = self.zoom_height()
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23
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24 if zoomed is None:
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25 self.top.bell()
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26 else:
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27 menu_status = 'Restore' if zoomed else 'Zoom'
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28 self.editwin.update_menu_label(menu='options', index='* Height',
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29 label=f'{menu_status} Height')
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30
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31 return "break"
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32
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33 def zoom_height(self):
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34 top = self.top
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35
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36 width, height, x, y = get_window_geometry(top)
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37
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38 if top.wm_state() != 'normal':
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39 # Can't zoom/restore window height for windows not in the 'normal'
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40 # state, e.g. maximized and full-screen windows.
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41 return None
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42
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43 try:
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44 maxheight, maxy = self.get_max_height_and_y_coord()
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45 except WmInfoGatheringError:
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46 return None
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47
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48 if height != maxheight:
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49 # Maximize the window's height.
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50 set_window_geometry(top, (width, maxheight, x, maxy))
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51 return True
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52 else:
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53 # Restore the window's height.
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54 #
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55 # .wm_geometry('') makes the window revert to the size requested
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56 # by the widgets it contains.
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57 top.wm_geometry('')
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58 return False
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59
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60 def get_max_height_and_y_coord(self):
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61 top = self.top
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62
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63 screen_dimensions = (top.winfo_screenwidth(),
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64 top.winfo_screenheight())
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65 if screen_dimensions not in self._max_height_and_y_coords:
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66 orig_state = top.wm_state()
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67
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68 # Get window geometry info for maximized windows.
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69 try:
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70 top.wm_state('zoomed')
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71 except tkinter.TclError:
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72 # The 'zoomed' state is not supported by some esoteric WMs,
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73 # such as Xvfb.
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74 raise WmInfoGatheringError(
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75 'Failed getting geometry of maximized windows, because ' +
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76 'the "zoomed" window state is unavailable.')
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77 top.update()
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78 maxwidth, maxheight, maxx, maxy = get_window_geometry(top)
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79 if sys.platform == 'win32':
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80 # On Windows, the returned Y coordinate is the one before
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81 # maximizing, so we use 0 which is correct unless a user puts
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82 # their dock on the top of the screen (very rare).
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83 maxy = 0
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84 maxrooty = top.winfo_rooty()
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85
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86 # Get the "root y" coordinate for non-maximized windows with their
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87 # y coordinate set to that of maximized windows. This is needed
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88 # to properly handle different title bar heights for non-maximized
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89 # vs. maximized windows, as seen e.g. in Windows 10.
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90 top.wm_state('normal')
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91 top.update()
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92 orig_geom = get_window_geometry(top)
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93 max_y_geom = orig_geom[:3] + (maxy,)
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94 set_window_geometry(top, max_y_geom)
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95 top.update()
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96 max_y_geom_rooty = top.winfo_rooty()
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97
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98 # Adjust the maximum window height to account for the different
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99 # title bar heights of non-maximized vs. maximized windows.
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100 maxheight += maxrooty - max_y_geom_rooty
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101
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102 self._max_height_and_y_coords[screen_dimensions] = maxheight, maxy
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103
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104 set_window_geometry(top, orig_geom)
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105 top.wm_state(orig_state)
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106
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107 return self._max_height_and_y_coords[screen_dimensions]
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108
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109
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110 def get_window_geometry(top):
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111 geom = top.wm_geometry()
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112 m = re.match(r"(\d+)x(\d+)\+(-?\d+)\+(-?\d+)", geom)
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113 return tuple(map(int, m.groups()))
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114
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115
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116 def set_window_geometry(top, geometry):
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117 top.wm_geometry("{:d}x{:d}+{:d}+{:d}".format(*geometry))
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118
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119
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120 if __name__ == "__main__":
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121 from unittest import main
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122 main('idlelib.idle_test.test_zoomheight', verbosity=2, exit=False)
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123
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124 # Add htest?
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