描述
包含列表视图控件的背景图像的信息.此结构用于设置和检索背景图像信息.
FreeBASIC 语法
TYPE LVBKIMAGEW ulFlags AS ULONG hbm AS HBITMAP pszImage AS LPWSTR cchImageMax AS UINT xOffsetPercent AS LONG yOffsetPercent AS LONG END TYPE |
成员
ulFlags
This member may be one or more of the following flags. You can use the LVBKIF_SOURCE_MASK value to mask off all but the source flags. You can use the LVBKIF_STYLE_MASK value to mask off all but the style flags.
LVBKIF_SOURCE_NONE
The list-view control has no background image.
LVBKIF_SOURCE_HBITMAP
A background bitmap is supplied via the hbm member of LVBKIMAGE. If the message LVM_SETBKIMAGE succeeds, then the list-view takes ownership of the bitmap.
LVBKIF_SOURCE_URL
The pszImage member contains the URL of the background image.
LVBKIF_STYLE_NORMAL
The background image is displayed normally.
LVBKIF_STYLE_TILE
The background image will be tiled to fill the entire background of the control.
LVBKIF_FLAG_TILEOFFSET
Specify the coordinates of the first tile. This flag is valid only if the LVBKIF_STYLE_TILE flag is also specified. If this flag is not specified, the first tile begins at the upper-left corner of the client area. If you use ComCtl32.dll Version 6.0 the xOffsetPercent and yOffsetPercent fields contain pixels, not percentage values, to specify the coordinates of the first tile. Comctl32.dll version 6 is not redistributable but it is included in Microsoft Windows XP or later. Also, you must specify Comctl32.dll version 6 in a manifest.
LVBKIF_TYPE_WATERMARK
A watermark background bitmap is supplied via the hbm member of LVBKIMAGE. If the LVM_SETBKIMAGE message succeeds, then the list-view control takes ownership of the bitmap.
LVBKIF_FLAG_ALPHABLEND
Valid only when LVBKIF_TYPE_WATERMARK is also specified. This flag indicates the bitmap provided via LVBKIF_TYPE_WATERMARK contains a valid alpha channel.
hbm
The handle of the background bitmap. This member is valid only if the LVBKIF_SOURCE_HBITMAP flag is set in ulFlags.
pszImage
Address of a NULL-terminated string that contains the URL of the background image. This member is valid only if the LVBKIF_SOURCE_URL flag is set in ulFlags. This member must be initialized to point to the buffer that contains or receives the text before sending the message.
cchImageMax
Size of the buffer at the address in pszImage. If information is being sent to the control, this member is ignored.
xOffsetPercent
Percentage of the control's client area that the image should be offset horizontally. For example, at 0 percent, the image will be displayed against the left edge of the control's client area. At 50 percent, the image will be displayed horizontally centered in the control's client area. At 100 percent, the image will be displayed against the right edge of the control's client area. This member is valid only when LVBKIF_STYLE_NORMAL is specified in ulFlags. If both LVBKIF_FLAG_TILEOFFSET and LVBKIF_STYLE_TILE are specified in ulFlags, then the value specifies the pixel, not percentage offset, of the first tile. Otherwise, the value is ignored.
yOffsetPercent
Percentage of the control's client area that the image should be offset vertically. For example, at 0 percent, the image will be displayed against the top edge of the control's client area. At 50 percent, the image will be displayed vertically centered in the control's client area. At 100 percent, the image will be displayed against the bottom edge of the control's client area. This member is valid only when LVBKIF_STYLE_NORMAL is specified in ulFlags. If both LVBKIF_FLAG_TILEOFFSET and LVBKIF_STYLE_TILE are specified in ulFlags, then the value specifies the pixel, not percentage offset, of the first tile. Otherwise, the value is ignored.
备注
这种结构是用LVM_GETBKIMAGE和LVM_SETBKIMAGE消息.
引用文件
CommCtrl.bi