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Advanced GUI Component Arrangement in Java: Layouts and Color Management

Explore the intricacies of arranging GUI components in Java through various layout managers such as FlowLayout, BorderLayout, and GridLayout. Understand how to use the Container class and its setLayout() method effectively for visual programming in an IDE. Learn about absolute positioning and the control it offers, while recognizing its potential tediousness. Delve into color management with java.awt.Color and JColorChooser for enhanced UI aesthetics. This lecture equips you with essential tools for creating dynamic and visually appealing applications.

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Advanced GUI Component Arrangement in Java: Layouts and Color Management

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  1. Advanced OOP MCS-3 OOP BSCS-3Lecture # 9

  2. TOPICS TO COVER Ways of Arranging Components in GUI • Uses Container class setLayout() method from java.awt package • Visual Programming in an IDE • Provides GUI design tool. • Supports drag and drop. • Absolute Positioning • Provides greatest level of control by setting setLayoutmethod to null. But it can be tedious to set absolute positioning. • Methods like setSize, setLocation, andsetBoundsare used. • Layout Managers • FlowLayout • BorderLayout • GridLayout

  3. TOPICS TO COVER FlowLayout class (java.awt.FlowLayout) • Default for javax.swing.JPanel • Components are placed from left to right in order they are added. • Automatically places components onto next row, if row is full. • FlowLayout() • FlowLayout(int) // alignment Row positioning options • FlowLayout.LEFT • FlowLayout.RIGHT • FlowLayout.CENTER (default) • void setAlignment(int) // alignment • intgetAlignment()

  4. TOPICS TO COVER BorderLayout class (java.awt.BorderLayout) • Default for javax.swing.JFrame • Arranges components in five regions • Places upto five components in a container one in each region. • Automatically displaces previous component, if component is already occupied in the position. • BorderLayout() • BorderLayout(int, int) // horizontal gap, vertical gap Regions • BorderLayout.NORTH • BorderLayout.SOUTH • BorderLayout.EAST • BorderLayout.WEST • BorderLayout.CENTER

  5. TOPICS TO COVER GridLayout class (java.awt.GridLayout) • Divides container into a grid so that components can be placed in rows and columns. • Each component has same width and height. • GridLayout() • GridLayout(int, int) // rows, columns • GridLayout(int, int, int, int) // rows, columns, horizontal gap, vertical gap • intgetColumns() • intgetHgap() • intgetRows() • intgetVgap() • void setColumns(intcols) • void setHgap(inthgap) • void setRows(introws) • void setVgap(intvgap)

  6. Color java.awt.Color • Color.BLACK • Color.BLUE • Color.CYAN • Color.DARK_GRAY • Color.GRAY • Color.GREEN • Color.LIGHT_GRAY • Color.MAGENTA • Color.ORANGE • Color.PINK • Color.RED • Color.WHITE • Color.YELLOW

  7. Color Color • Color(int, int, int) // red, green, blue ranging from 0 to 255 • Color brighter() • Color darker() • intgetRed() • intgetGreen() • intgetBlue() JColorChooser class in javax.swing.JColorChooser • Color showDialog(Component, String, Color) //component, title of dialogbox, initial color

  8. Good Luck ! ☻. . .

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