2012-03-24 16:22:40 +01:00
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UIScrollBar = extends(UIWidget)
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2012-03-25 16:10:15 +02:00
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-- private functions
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local function calcValues(self)
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local slider = self:getChildById('sliderButton')
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local decrementButton = self:getChildById('decrementButton')
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local incrementButton = self:getChildById('incrementButton')
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local pxrange, center
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if self.orientation == 'vertical' then
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pxrange = (self:getHeight() - decrementButton:getHeight() - decrementButton:getMarginTop() - decrementButton:getMarginBottom()
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- incrementButton:getHeight() - incrementButton:getMarginTop() - incrementButton:getMarginBottom())
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center = self:getY() + self:getHeight() / 2
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else -- horizontal
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pxrange = (self:getWidth() - decrementButton:getWidth() - decrementButton:getMarginLeft() - decrementButton:getMarginRight()
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- incrementButton:getWidth() - incrementButton:getMarginLeft() - incrementButton:getMarginRight())
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center = self:getX() + self:getWidth() / 2
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end
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local range = self.maximum - self.minimum + 1
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2012-03-25 19:10:19 +02:00
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local proportion = math.min(math.max(range*(self.step/range), 1), range)/range
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2012-03-25 16:10:15 +02:00
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local px = math.max(math.floor(proportion * pxrange), 10)
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2012-03-25 19:10:19 +02:00
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local offset = 0
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if range > 1 then
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2012-03-26 15:34:43 +02:00
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offset = math.ceil((((self.value - self.minimum) / (range - 1)) - 0.5) * (pxrange - px))
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2012-03-25 19:10:19 +02:00
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end
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2012-03-25 16:10:15 +02:00
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return range, pxrange, px, offset, center
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end
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local function updateSlider(self)
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local slider = self:getChildById('sliderButton')
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if slider == nil then return end
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local range, pxrange, px, offset, center = calcValues(self)
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if self.orientation == 'vertical' then
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slider:setHeight(px)
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slider:setMarginTop(offset)
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else -- horizontal
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slider:setWidth(px)
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slider:setMarginLeft(offset)
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end
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if self.maximum == self.minimum then
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self:disable()
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else
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self:enable()
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end
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end
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local function parseSliderPos(self, pos)
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local point
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if self.orientation == 'vertical' then
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point = pos.y
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else
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point = pos.x
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end
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local range, pxrange, px, offset, center = calcValues(self)
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offset = math.min(math.max(point - center, -pxrange/2), pxrange/2)
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2012-03-25 19:10:19 +02:00
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local newvalue = math.floor(((offset / (pxrange - px)) + 0.5) * (range - 1)) + self.minimum
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2012-03-25 16:10:15 +02:00
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self:setValue(newvalue)
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end
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-- public functions
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2012-03-24 16:22:40 +01:00
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function UIScrollBar.create()
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local scrollbar = UIScrollBar.internalCreate()
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scrollbar:setFocusable(false)
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2012-03-25 16:10:15 +02:00
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scrollbar.value = 0
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scrollbar.minimum = 0
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scrollbar.maximum = 0
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scrollbar.step = 1
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scrollbar.orientation = 'vertical'
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2012-03-24 16:22:40 +01:00
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return scrollbar
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end
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function UIScrollBar:onSetup()
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2012-03-25 16:10:15 +02:00
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addEvent(function()
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Mouse.bindAutoPress(self:getChildById('decrementButton'), function() self:decrement() end)
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Mouse.bindAutoPress(self:getChildById('incrementButton'), function() self:increment() end)
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Mouse.bindPressMove(self:getChildById('sliderButton'), function(mousePos, mouseMoved) parseSliderPos(self, mousePos) end)
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updateSlider(self)
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end)
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2012-03-24 16:22:40 +01:00
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end
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function UIScrollBar:onStyleApply(styleName, styleNode)
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2012-03-25 16:10:15 +02:00
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for name,value in pairs(styleNode) do
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if name == 'maximum' then
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self:setMaximum(tonumber(value))
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elseif name == 'minimum' then
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self:setMinimum(tonumber(value))
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elseif name == 'step' then
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self:setStep(tonumber(value))
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elseif name == 'orientation' then
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self:setOrientation(value)
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elseif name == 'value' then
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self:setValue(value)
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2012-03-24 16:22:40 +01:00
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end
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end
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end
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2012-03-25 16:10:15 +02:00
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function UIScrollBar:decrement()
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self:setValue(self.value - self.step)
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end
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function UIScrollBar:increment()
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self:setValue(self.value + self.step)
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end
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function UIScrollBar:setMaximum(maximum)
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if maximum == self.maximum then return end
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self.maximum = maximum
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if self.value > maximum then
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self:setValue(maximum)
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else
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updateSlider(self)
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end
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end
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function UIScrollBar:setMinimum(minimum)
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if minimum == self.minimum then return end
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self.minimum = minimum
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if self.value < minimum then
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self:setValue(minimum)
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else
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updateSlider(self)
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end
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end
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function UIScrollBar:setRange(minimum, maximum)
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self:setMinimum(minimum)
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self:setMaximum(maximum)
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end
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function UIScrollBar:setValue(value)
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value = math.max(math.min(value, self.maximum), self.minimum)
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if self.value == value then return end
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local delta = value - self.value
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self.value = value
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updateSlider(self)
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signalcall(self.onValueChange, self, value, delta)
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end
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function UIScrollBar:setStep(step)
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self.step = step
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end
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function UIScrollBar:setOrientation(orientation)
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self.orientation = orientation
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end
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function UIScrollBar:onGeometryChange()
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updateSlider(self)
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end
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2012-03-26 15:34:43 +02:00
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function UIScrollBar:onMouseWheel(mousePos, mouseWheel)
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if mouseWheel == MouseWheelUp then
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self:decrement()
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else
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self:increment()
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end
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return true
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end
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2012-03-25 16:10:15 +02:00
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function UIScrollBar:getMaximum() return self.maximum end
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function UIScrollBar:getMinimum() return self.minimum end
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function UIScrollBar:getValue() return self.value end
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function UIScrollBar:getStep() return self.step end
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function UIScrollBar:getOrientation() return self.orientation end
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