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bl_ui_drag_panel.py
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# ##### BEGIN GPL LICENSE BLOCK #####
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####
#--- ### Header
bl_info = {
"name": "BL UI Widgets",
"description": "UI Widgets to draw in the 3D view",
"author": "Marcelo M. Marques (fork of Jayanam's original project)",
"version": (1, 0, 0),
"blender": (2, 80, 75),
"location": "View3D > viewport area",
"support": "COMMUNITY",
"category": "3D View",
"warning": "Version numbering diverges from Jayanam's original project",
"doc_url": "https://github.com/mmmrqs/bl_ui_widgets",
"tracker_url": "https://github.com/mmmrqs/bl_ui_widgets/issues"
}
#--- ### Change log
#v1.0.0 (09.01.2021) - by Marcelo M. Marques
#Added: A control to check if the panel can be dragged by the user or must stay locked in position
#Added: Logic to save/restore panel position from last session, or from last use (depending on addon 'preferences' setup)
#Added: Logic to scale the panel according to both Blender's ui scale configuration and this addon 'preferences' setup
#Added: 'style' property which automatically sets the visual according to Blender's user themes.
#Added: 'outline_color' property to allow different color on the panel outline (value is standard color tuple).
#Added: 'roundness' property to allow the panel to be painted with rounded corners,
# same as that property available in Blender's user themes and it works together with 'rounded_corners' below.
#Added: 'corner_radius' property to allow a limit for the roundness curvature, more useful when 'roundness' property
# is not overriden by programmer and the one from Blender's user themes is used instead.
#Added: 'rounded_corners' property to allow the panel to be painted with rounded corners (value is a 4 elements tuple).
# Each elements is a boolean value (0 or 1) which indicates whether the corresponding corner is to be rounded or straight
# in the following clockwise sequence: bottom left, top left, top right, bottom right.
#Added: 'shadow' property to allow the panel to be painted with a shadow (value is boolean).
#Chang: Made it a subclass of 'BL_UI_Patch' instead of 'BL_UI_Widget' so that it can inherit the layout features from there.
#Chang: Renamed some local variables so that those become restricted to this class only.
#--- ### Imports
import bpy
from . bl_ui_patch import BL_UI_Patch
class BL_UI_Drag_Panel(BL_UI_Patch):
def __init__(self, x, y, width, height):
try:
package = __package__[0:__package__.find(".")]
RC_POSITION = bpy.context.preferences.addons[package].preferences.RC_POSITION
RC_POS_X = bpy.context.preferences.addons[package].preferences.RC_POS_X
RC_POS_Y = bpy.context.preferences.addons[package].preferences.RC_POS_Y
except:
RC_POSITION = False
if RC_POSITION:
if RC_POS_X != -10000 and RC_POS_Y != -10000:
# Override input values with the ones saved from last time (any scene/session)
x = RC_POS_X
y = RC_POS_Y
else:
if bpy.context.scene.get("bl_ui_panel_saved_data") is None:
pass
else:
# Override input values with the ones saved from last session
x = bpy.context.scene.get("bl_ui_panel_saved_data")["panX"]
y = bpy.context.scene.get("bl_ui_panel_saved_data")["panY"]
# Need to apply scale to compensate for posterior calculations
x = (x / self.over_scale(1))
y = (y / self.over_scale(1))
super().__init__(x, y, width, height)
self.widgets = []
# Note: '_style' value will always be ignored if the bg_color value is overriden after object initialization.
self._style = 'NONE' # Panel background color styles are: {HEADER,PANEL,SUBPANEL,TOOLTIP,NONE}
self._bg_color = None # Panel background color (defaults to invisible)
self._outline_color = None # Panel outline color (defaults to invisible)
self._roundness = 0 # Panel corners roundness factor [0..1]
self._radius = 0 # Panel corners circular radius
self._rounded_corners = (0,0,0,0) # 1=Round/0=Straight, coords:(bottomLeft,topLeft,topRight,bottomRight)
self._has_shadow = False # Indicates whether a shadow must be drawn around the panel
self._anchored = False # Indicates whether panel can be dragged around the viewport or not
self.__drag_offset_x = 0
self.__drag_offset_y = 0
self.__is_drag = False
@property
def anchored(self):
return self._anchored
@anchored.setter
def anchored(self, value):
self._anchored = value
def add_widget(self, widget):
self.widgets.append(widget)
def add_widgets(self, widgets):
for widget in widgets:
self.add_widget(widget)
def layout_widgets(self):
for widget in self.widgets:
widget.update(self.x_screen + widget.x, self.y_screen - widget.y)
def child_widget_focused(self, x, y):
for widget in self.widgets:
if widget.visible:
if widget.is_in_rect(x, y):
return True
return False
def save_panel_coords(self, x, y):
# Update the new coord values in the session's saved data dictionary.
# Note: Because of the scaling logic it was necessary to make this weird correction math below
new_x = self.over_scale(x)
new_y = self.over_scale(y)
bpy.context.scene["bl_ui_panel_saved_data"] = {"panX" : new_x, "panY" : new_y}
try:
# Update values also in the add-on's preferences properties
package = __package__[0:__package__.find(".")]
bpy.context.preferences.addons[package].preferences.RC_POS_X = new_x
bpy.context.preferences.addons[package].preferences.RC_POS_Y = new_y
except:
pass
# Overrides base class function
def update(self, x, y):
super().update(x,y)
if self.__is_drag:
# Inform that widget has shift position so that tooltip know it must be recalculated
base_class = super().__thisclass__.__mro__[-2] # This stunt only to avoid hard coding the Base class name
widget = base_class.g_tooltip_widget
if widget is None:
pass
else:
widget.tooltip_moved = True
# Overrides base class function
def set_location(self, x, y):
super().set_location(x,y)
self.layout_widgets()
# Overrides base class function
def mouse_down(self, event, x, y):
if self.child_widget_focused(x,y):
# Means the focus is on some sub-widget (e.g.: a button)
return False
if self.anchored:
# Means the panel is not draggable
return False
if self.is_in_rect(x,y):
# When panel is disabled, just ignore the click
if self._is_enabled:
height = self.get_area_height()
self.__is_drag = True
self.__drag_offset_x = x - self.x_screen
self.__drag_offset_y = y - self.y_screen
return True # <-- Perhaps should only return 'True' if self._is_enabled (TBD)
else:
return False
# Overrides base class function
def mouse_move(self, event, x, y):
if self.__is_drag:
# Recalculate and update the new position on the viewport
new_x = x - self.__drag_offset_x
new_y = y - self.__drag_offset_y
self.save_panel_coords(new_x, new_y)
self.update(new_x, new_y)
self.layout_widgets()
return False
# Overrides base class function
def mouse_up(self, event, x, y):
self.__is_drag = False
self.__drag_offset_x = 0
self.__drag_offset_y = 0
return False