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Text File | 1995-07-26 | 17.6 KB | 331 lines

ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn)))) _________________________________________________________________ NNNNAAAAMMMMEEEE pack - Geometry manager that packs around edges of cavity SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS ppppaaaacccckkkk _o_p_t_i_o_n _a_r_g ?_a_r_g ...? _________________________________________________________________ DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN The ppppaaaacccckkkk command is used to communicate with the packer, a geometry manager that arranges the children of a parent by packing them in order around the edges of the parent. The ppppaaaacccckkkk command can have any of several forms, depending on the _o_p_t_i_o_n argument: ppppaaaacccckkkk _s_l_a_v_e ?_s_l_a_v_e ...? ?_o_p_t_i_o_n_s? If the first argument to ppppaaaacccckkkk is a window name (any value starting with ``.''), then the command is processed in the same way as ppppaaaacccckkkk ccccoooonnnnffffiiiigggguuuurrrreeee. ppppaaaacccckkkk ccccoooonnnnffffiiiigggguuuurrrreeee _s_l_a_v_e ?_s_l_a_v_e ...? ?_o_p_t_i_o_n_s? The arguments consist of the names of one or more slave windows followed by pairs of arguments that specify how to manage the slaves. See ``THE PACKER ALGORITHM'' below for details on how the options are used by the packer. The following options are supported: ----aaaafffftttteeeerrrr _o_t_h_e_r _O_t_h_e_r must the name of another window. Use its master as the master for the slaves, and insert the slaves just after _o_t_h_e_r in the packing order. ----aaaannnncccchhhhoooorrrr _a_n_c_h_o_r _A_n_c_h_o_r must be a valid anchor position such as nnnn or sssswwww; it specifies where to position each slave in its parcel. Defaults to cccceeeennnntttteeeerrrr. ----bbbbeeeeffffoooorrrreeee _o_t_h_e_r _O_t_h_e_r must the name of another window. Use its master as the master for the slaves, and insert the slaves just before _o_t_h_e_r in the packing order. ----eeeexxxxppppaaaannnndddd _b_o_o_l_e_a_n Specifies whether the slaves should be expanded to consume extra space in their master. _B_o_o_l_e_a_n may have any proper boolean value, such as 1111 or nnnnoooo. Defaults to 0. ----ffffiiiillllllll _s_t_y_l_e If a slave's parcel is larger than its requested Page 1 (printed 7/23/95) ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn)))) dimensions, this option may be used to stretch the slave. _S_t_y_l_e must have one of the following values: nnnnoooonnnneeee Give the slave its requested dimensions plus any internal padding requested with ----iiiippppaaaaddddxxxx or ----iiiippppaaaaddddyyyy. This is the default. xxxx Stretch the slave horizontally to fill the entire width of its parcel (except leave external padding as specified by ----ppppaaaaddddxxxx). yyyy Stretch the slave vertically to fill the entire height of its parcel (except leave external padding as specified by ----ppppaaaaddddyyyy). bbbbooootttthhhh Stretch the slave both horizontally and vertically. ----iiiinnnn _o_t_h_e_r Insert the slave(s) at the end of the packing order for the master window given by _o_t_h_e_r. ----iiiippppaaaaddddxxxx _a_m_o_u_n_t _A_m_o_u_n_t specifies how much horizontal internal padding to leave on each side of the slave(s). _A_m_o_u_n_t must be a valid screen distance, such as 2222 or ....5555cccc. It defaults to 0. ----iiiippppaaaaddddyyyy _a_m_o_u_n_t _A_m_o_u_n_t specifies how much vertical internal padding to leave on each side of the slave(s). _A_m_o_u_n_t defaults to 0. ----ppppaaaaddddxxxx _a_m_o_u_n_t _A_m_o_u_n_t specifies how much horizontal external padding to leave on each side of the slave(s). _A_m_o_u_n_t defaults to 0. ----ppppaaaaddddyyyy _a_m_o_u_n_t _A_m_o_u_n_t specifies how much vertical external padding to leave on each side of the slave(s). _A_m_o_u_n_t defaults to 0. ----ssssiiiiddddeeee _s_i_d_e Specifies which side of the master the slave(s) will be packed against. Must be lllleeeefffftttt, rrrriiiigggghhhhtttt, ttttoooopppp, or bbbboooottttttttoooommmm. Defaults to ttttoooopppp. If no ----iiiinnnn, ----aaaafffftttteeeerrrr or ----bbbbeeeeffffoooorrrreeee option is specified then each of the slaves will be inserted at the end of the packing list for its parent unless it is already Page 2 (printed 7/23/95) ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn)))) managed by the packer (in which case it will be left where it is). If one of these options is specified then all the slaves will be inserted at the specified point. If any of the slaves are already managed by the geometry manager then any unspecified options for them retain their previous values rather than receiving default values. ppppaaaacccckkkk ffffoooorrrrggggeeeetttt _s_l_a_v_e ?_s_l_a_v_e ...? Removes each of the _s_l_a_v_es from the packing order for its master and unmaps their windows. The slaves will no longer be managed by the packer. ppppaaaacccckkkk nnnneeeewwwwiiiinnnnffffoooo _s_l_a_v_e Returns a list whose elements are the current configuration state of the slave given by _s_l_a_v_e in the same option-value form that might be specified to ppppaaaacccckkkk ccccoooonnnnffffiiiigggguuuurrrreeee. The first two elements of the list are ``----iiiinnnn _m_a_s_t_e_r'' where _m_a_s_t_e_r is the slave's master. Starting with Tk 4.0 this option will be renamed "pack info". ppppaaaacccckkkk pppprrrrooooppppaaaaggggaaaatttteeee _m_a_s_t_e_r ?_b_o_o_l_e_a_n? If _b_o_o_l_e_a_n has a true boolean value such as 1111 or oooonnnn then propagation is enabled for _m_a_s_t_e_r, which must be a window name (see ``GEOMETRY PROPAGATION'' below). If _b_o_o_l_e_a_n has a false boolean value then propagation is disabled for _m_a_s_t_e_r. In either of these cases an empty string is returned. If _b_o_o_l_e_a_n is omitted then the command returns 0000 or 1111 to indicate whether propagation is currently enabled for _m_a_s_t_e_r. Propagation is enabled by default. ppppaaaacccckkkk ssssllllaaaavvvveeeessss _m_a_s_t_e_r Returns a list of all of the slaves in the packing order for _m_a_s_t_e_r. The order of the slaves in the list is the same as their order in the packing order. If _m_a_s_t_e_r has no slaves then an empty string is returned. TTTTHHHHEEEE PPPPAAAACCCCKKKKEEEERRRR AAAALLLLGGGGOOOORRRRIIIITTTTHHHHMMMM For each master the packer maintains an ordered list of slaves called the _p_a_c_k_i_n_g _l_i_s_t. The ----iiiinnnn, ----aaaafffftttteeeerrrr, and ----bbbbeeeeffffoooorrrreeee configuration options are used to specify the master for each slave and the slave's position in the packing list. If none of these options is given for a slave then the slave is added to the end of the packing list for its parent. The packer arranges the slaves for a master by scanning the packing list in order. At the time it processes each slave, a rectangular area within the master is still unallocated. This area is called the _c_a_v_i_t_y; for the first slave it is Page 3 (printed 7/23/95) ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn)))) the entire area of the master. For each slave the packer carries out the following steps: [1] The packer allocates a rectangular _p_a_r_c_e_l for the slave along the side of the cavity given by the slave's ----ssssiiiiddddeeee option. If the side is top or bottom then the width of the parcel is the width of the cavity and its height is the requested height of the slave plus the ----iiiippppaaaaddddyyyy and ----ppppaaaaddddyyyy options. For the left or right side the height of the parcel is the height of the cavity and the width is the requested width of the slave plus the ----iiiippppaaaaddddxxxx and ----ppppaaaaddddxxxx options. The parcel may be enlarged further because of the ----eeeexxxxppppaaaannnndddd option (see ``EXPANSION'' below) [2] The packer chooses the dimensions of the slave. The width will normally be the slave's requested width plus twice its ----iiiippppaaaaddddxxxx option and the height will normally be the slave's requested height plus twice its ----iiiippppaaaaddddyyyy option. However, if the ----ffffiiiillllllll option is xxxx or bbbbooootttthhhh then the width of the slave is expanded to fill the width of the parcel, minus twice the ----ppppaaaaddddxxxx option. If the ----ffffiiiillllllll option is yyyy or bbbbooootttthhhh then the height of the slave is expanded to fill the width of the parcel, minus twice the ----ppppaaaaddddyyyy option. [3] The packer positions the slave over its parcel. If the slave is smaller than the parcel then the ----aaaannnncccchhhhoooorrrr option determines where in the parcel the slave will be placed. If ----ppppaaaaddddxxxx or ----ppppaaaaddddyyyy is non-zero, then the given amount of external padding will always be left between the slave and the edges of the parcel. Once a given slave has been packed, the area of its parcel is subtracted from the cavity, leaving a smaller rectangular cavity for the next slave. If a slave doesn't use all of its parcel, the unused space in the parcel will not be used by subsequent slaves. If the cavity should become too small to meet the needs of a slave then the slave will be given whatever space is left in the cavity. If the cavity shrinks to zero size, then all remaining slaves on the packing list will be unmapped from the screen until the master window becomes large enough to hold them again. EEEEXXXXPPPPAAAANNNNSSSSIIIIOOOONNNN If a master window is so large that there will be extra space left over after all of its slaves have been packed, then the extra space is distributed uniformly among all of the slaves for which the ----eeeexxxxppppaaaannnndddd option is set. Extra horizontal space is distributed among the expandable slaves whose ----ssssiiiiddddeeee is lllleeeefffftttt or rrrriiiigggghhhhtttt, and extra vertical space is Page 4 (printed 7/23/95) ppppaaaacccckkkk((((nnnn)))) TTTTkkkk (((( )))) ppppaaaacccckkkk((((nnnn)))) distributed among the expandable slaves whose ----ssssiiiiddddeeee is ttttoooopppp or bbbboooottttttttoooommmm. GGGGEEEEOOOOMMMMEEEETTTTRRRRYYYY PPPPRRRROOOOPPPPAAAAGGGGAAAATTTTIIIIOOOONNNN The packer normally computes how large a master must be to just exactly meet the needs of its slaves, and it sets the requested width and height of the master to these dimensions. This causes geometry information to propagate up through a window hierarchy to a top-level window so that the entire sub-tree sizes itself to fit the needs of the leaf windows. However, the ppppaaaacccckkkk pppprrrrooooppppaaaaggggaaaatttteeee command may be used to turn off propagation for one or more masters. If propagation is disabled then the packer will not set the requested width and height of the packer. This may be useful if, for example, you wish for a master window to have a fixed size that you specify. RRRREEEESSSSTTTTRRRRIIIICCCCTTTTIIIIOOOONNNNSSSS OOOONNNN MMMMAAAASSSSTTTTEEEERRRR WWWWIIIINNNNDDDDOOOOWWWWSSSS The master for each slave must either be the slave's parent (the default) or a descendant of the slave's parent. This restriction is necessary to guarantee that the slave can be placed over any part of its master that is visible without danger of the slave being clipped by its parent. PPPPAAAACCCCKKKKIIIINNNNGGGG OOOORRRRDDDDEEEERRRR If the master for a slave is not its parent then you must make sure that the slave is higher in the stacking order than the master. Otherwise the master will obscure the slave and it will appear as if the slave hasn't been packed correctly. The easiest way to make sure the slave is higher than the master is to create the master window first: the most recently created window will be highest in the stacking order. Or, you can use the rrrraaaaiiiisssseeee and lllloooowwwweeeerrrr commands to change the stacking order of either the master or the slave. KKKKEEEEYYYYWWWWOOOORRRRDDDDSSSS geometry manager, location, packer, parcel, propagation, size Page 5 (printed 7/23/95)