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nodebox-pyobjc/nodebox/gui/mac/ValueLadder.py
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from Foundation import * | |
from AppKit import * | |
MAGICVAR = "__magic_var__" | |
class ValueLadder: | |
view = None | |
visible = False | |
value = None | |
origValue = None | |
dirty = False | |
type = None | |
negative = False | |
unary = False | |
add = False | |
def __init__(self, textView, value, clickPos, screenPoint, viewPoint): | |
self.textView = textView | |
self.value = value | |
self.origValue = value | |
self.type = type(value) | |
self.clickPos = clickPos | |
self.origX, self.origY = screenPoint | |
self.x, self.y = screenPoint | |
self.viewPoint = viewPoint | |
(x,y),(self.width,self.height) = self.textView.bounds() | |
self.originalString = self.textView.string() | |
self.backgroundColor = NSColor.colorWithCalibratedRed_green_blue_alpha_(0.4,0.4,0.4,1.0) | |
self.strokeColor = NSColor.colorWithCalibratedRed_green_blue_alpha_(0.1,0.1,0.1, 1.0) | |
self.textColor = NSColor.colorWithCalibratedRed_green_blue_alpha_(1.,1.,1.,1.) | |
paraStyle = NSMutableParagraphStyle.alloc().init() | |
paraStyle.setAlignment_(NSCenterTextAlignment) | |
font = NSFont.fontWithName_size_("Monaco", 10) | |
self.textAttributes = {NSForegroundColorAttributeName:self.textColor,NSParagraphStyleAttributeName:paraStyle,NSFontAttributeName:font} | |
# To speed things up, the code is compiled only once. | |
# The number is replaced with a magic variable, that is set in the | |
# namespace when executing the code. | |
begin,end = self.clickPos | |
self.patchedSource = self.originalString[:begin] + MAGICVAR + self.originalString[end:] | |
#ast = parse(self.patchedSource + "\n\n") | |
#self._checkSigns(ast) | |
success, output = self.textView.document._boxedRun(self._parseAndCompile) | |
if success: | |
self.show() | |
else: | |
self.textView.document._flushOutput(output) | |
def _parseAndCompile(self): | |
from compiler import parse | |
ast = parse(self.patchedSource.encode('ascii', 'replace') + "\n\n") | |
self._checkSigns(ast) | |
self.textView.document._compileScript(self.patchedSource) | |
def _checkSigns(self, node): | |
"""Recursively check for special sign cases. | |
The following cases are special: | |
- Substraction. When you select the last part of a substraction | |
(e.g. the 5 of "10-5"), it might happen that you drag the number to | |
a positive value. In that case, the result should be "10+5". | |
- Unary substraction. Values like "-5" should have their sign removed | |
when you drag them to a positive value. | |
- Addition. When you select the last part of an addition | |
(e.g. the 5 of "10+5"), and drag the number to a negative value, | |
the result should be "10-5". | |
This algorithm checks for these cases. It tries to find the magic var, | |
and then checks the parent node to see if it is one of these cases, | |
then sets the appropriate state variables in the object. | |
This algorithm is recursive. Because we have to differ between a | |
"direct hit" (meaning the current child was the right one) and a | |
"problem resolved" (meaning the algorithm found the node, did its | |
work and now needs to bail out), we have three return codes: | |
- -1: nothing was found in this node and its child nodes. | |
- 1: direct hit. The child you just searched contains the magicvar. | |
check the current node to see if it is one of the special cases. | |
- 0: bail out. Somewhere, a child contained the magicvar, and we | |
acted upon it. Now leave this algorithm as soon as possible. | |
""" | |
from compiler.ast import Sub, UnarySub, Add | |
# Check whether I am the correct node | |
try: | |
if node.name == MAGICVAR: | |
return 1 # If i am, return the "direct hit" code. | |
except AttributeError: | |
pass | |
# We keep an index to see what child we are checking. This | |
# is important for binary operations, were we are only interested | |
# in the second part. ("a-10" has to change to "a+10", | |
# but "10-a" shouldn't change to "+10-a") | |
index = 0 | |
# Recursively check my children | |
for child in node.getChildNodes(): | |
retVal = self._checkSigns(child) | |
# Direct hit. The child I just searched contains the magicvar. | |
# Check whether this node is one of the special cases. | |
if retVal == 1: | |
# Unary substitution. | |
if isinstance(node, UnarySub): | |
self.negative = True | |
self.unary = True | |
# Binary substitution. Only the second child is of importance. | |
elif isinstance(node, Sub) and index == 1: | |
self.negative = True | |
# Binary addition. Only the second child is of importance. | |
elif isinstance(node, Add) and index == 1: | |
self.add = True | |
# Return the "bail out" code, whether we found some | |
# special case or not. There can only be one magicvar in the | |
# code, so once that is found we can stop looking. | |
return 0 | |
# If the child returns a bail out code, we leave this routine | |
# without checking the other children, passing along the | |
# bail out code. | |
elif retVal == 0: | |
return 0 # Nothing more needs to be done. | |
# Next child. | |
index += 1 | |
# We searched all children, but couldn't find any magicvars. | |
return -1 | |
def show(self): | |
self.visible = True | |
self.textView.setNeedsDisplay_(True) | |
NSCursor.hide() | |
def hide(self): | |
"""Hide the ValueLadder and update the code. | |
Updating the code means we have to replace the current value with | |
the new value, and account for any special cases.""" | |
self.visible = False | |
begin,end = self.clickPos | |
# Potentionally change the sign on the number. | |
# The following cases are valid: | |
# - A subtraction where the value turned positive "random(5-8)" --> "random(5+8)" | |
# - A unary subtraction where the value turned positive "random(-5)" --> "random(5)" | |
# Note that the sign dissapears here. | |
# - An addition where the second part turns negative "random(5+8)" --> "random(5-8)" | |
# Note that the code replaces the sign on the place where it was, leaving the code intact. | |
# Case 1: Negative numbers where the new value is negative as well. | |
# This means the numbers turn positive. | |
if self.negative and self.value < 0: | |
# Find the minus sign. | |
i = begin - 1 | |
notFound = True | |
while True: | |
if self.originalString[i] == '-': | |
if self.unary: # Unary subtractions will have the sign removed. | |
# Re-create the string: the spaces between the value and the '-' + the value | |
value = self.originalString[i+1:begin] + str(abs(self.value)) | |
else: # Binary subtractions get a '+' | |
value = '+' + self.originalString[i+1:begin] + str(abs(self.value)) | |
range = (i,end-i) | |
break | |
i -= 1 | |
# Case 2: Additions (only additions where we are the second part | |
# interests us, this is checked already on startup) | |
elif self.add and self.value < 0: | |
# Find the plus sign. | |
i = begin - 1 | |
notFound = True | |
while True: | |
if self.originalString[i] == '+': | |
# Re-create the string: | |
# - a '+' (instead of the minus) | |
# - the spaces between the '-' and the constant | |
# - the constant itself | |
value = '-' + self.originalString[i+1:begin] + str(abs(self.value)) | |
range = (i,end-i) | |
break | |
i -= 1 | |
# Otherwise, it's a normal case. Note that here also, positive numbers | |
# can turn negative, but no existing signs have to be changed. | |
else: | |
value = str(self.value) | |
range = (begin, end-begin) | |
# The following textView methods make sure that an undo operation | |
# is registered, so users can undo their drag. | |
self.textView.shouldChangeTextInRange_replacementString_(range, value) | |
self.textView.textStorage().replaceCharactersInRange_withString_(range, value) | |
self.textView.didChangeText() | |
self.textView.setNeedsDisplay_(True) | |
self.textView.document.currentView.direct = False | |
NSCursor.unhide() | |
def draw(self): | |
mx,my=self.viewPoint | |
x = mx-20 | |
w = 80 | |
h = 20 | |
h2 = h*2 | |
context = NSGraphicsContext.currentContext() | |
aa = context.shouldAntialias() | |
context.setShouldAntialias_(False) | |
r = ((mx-w/2,my+12),(w,h)) | |
NSBezierPath.setDefaultLineWidth_(0) | |
self.backgroundColor.set() | |
NSBezierPath.fillRect_(r) | |
self.strokeColor.set() | |
NSBezierPath.strokeRect_(r) | |
# A standard value just displays the value that you have been dragging. | |
if not self.negative: | |
v = str(self.value) | |
# When the value is negative, we don't display a double negative, | |
# but a positive. | |
elif self.value < 0: | |
v = str(abs(self.value)) | |
# When the value is positive, we have to add a minus sign. | |
else: | |
v = "-" + str(self.value) | |
NSString.drawInRect_withAttributes_(v, ((mx-w/2,my+14),(w,h2)), self.textAttributes) | |
context.setShouldAntialias_(aa) | |
def mouseDragged_(self, event): | |
mod = event.modifierFlags() | |
newX, newY = NSEvent.mouseLocation() | |
deltaX = newX-self.x | |
delta = deltaX | |
if self.negative: | |
delta = -delta | |
if mod & NSAlternateKeyMask: | |
delta /= 100.0 | |
elif mod & NSShiftKeyMask: | |
delta *= 10.0 | |
self.value = self.type(self.value + delta) | |
self.x, self.y = newX, newY | |
self.dirty = True | |
self.textView.setNeedsDisplay_(True) | |
self.textView.document.magicvar = self.value | |
self.textView.document.currentView.direct = True | |
self.textView.document.runScriptFast() |